mirror of
https://github.com/golang/go
synced 2024-11-23 05:10:09 -07:00
9146ac14ee
Fixes #2615. R=dave, minux.ma, iant, daniel.morsing, rsc CC=golang-dev https://golang.org/cl/6847078
548 lines
12 KiB
Go
548 lines
12 KiB
Go
// run
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// Copyright 2012 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Issue 2615: a long chain of else if's causes an overflow
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// in the parser stack.
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package main
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// test returns the index of the lowest set bit in a 256-bit vector.
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func test(x [4]uint64) int {
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if x[0]&(1<<0) != 0 {
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return 0
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} else if x[0]&(1<<1) != 0 {
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return 1
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} else if x[0]&(1<<2) != 0 {
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return 2
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} else if x[0]&(1<<3) != 0 {
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return 3
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} else if x[0]&(1<<4) != 0 {
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return 4
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} else if x[0]&(1<<5) != 0 {
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return 5
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} else if x[0]&(1<<6) != 0 {
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return 6
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} else if x[0]&(1<<7) != 0 {
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return 7
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} else if x[0]&(1<<8) != 0 {
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return 8
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} else if x[0]&(1<<9) != 0 {
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return 9
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} else if x[0]&(1<<10) != 0 {
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return 10
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} else if x[0]&(1<<11) != 0 {
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return 11
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} else if x[0]&(1<<12) != 0 {
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return 12
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} else if x[0]&(1<<13) != 0 {
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return 13
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} else if x[0]&(1<<14) != 0 {
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return 14
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} else if x[0]&(1<<15) != 0 {
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return 15
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} else if x[0]&(1<<16) != 0 {
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return 16
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} else if x[0]&(1<<17) != 0 {
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return 17
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} else if x[0]&(1<<18) != 0 {
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return 18
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} else if x[0]&(1<<19) != 0 {
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return 19
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} else if x[0]&(1<<20) != 0 {
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return 20
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} else if x[0]&(1<<21) != 0 {
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return 21
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} else if x[0]&(1<<22) != 0 {
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return 22
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} else if x[0]&(1<<23) != 0 {
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return 23
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} else if x[0]&(1<<24) != 0 {
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return 24
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} else if x[0]&(1<<25) != 0 {
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return 25
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} else if x[0]&(1<<26) != 0 {
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return 26
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} else if x[0]&(1<<27) != 0 {
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return 27
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} else if x[0]&(1<<28) != 0 {
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return 28
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} else if x[0]&(1<<29) != 0 {
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return 29
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} else if x[0]&(1<<30) != 0 {
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return 30
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} else if x[0]&(1<<31) != 0 {
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return 31
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} else if x[0]&(1<<32) != 0 {
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return 32
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} else if x[0]&(1<<33) != 0 {
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return 33
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} else if x[0]&(1<<34) != 0 {
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return 34
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} else if x[0]&(1<<35) != 0 {
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return 35
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} else if x[0]&(1<<36) != 0 {
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return 36
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} else if x[0]&(1<<37) != 0 {
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return 37
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} else if x[0]&(1<<38) != 0 {
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return 38
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} else if x[0]&(1<<39) != 0 {
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return 39
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} else if x[0]&(1<<40) != 0 {
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return 40
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} else if x[0]&(1<<41) != 0 {
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return 41
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} else if x[0]&(1<<42) != 0 {
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return 42
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} else if x[0]&(1<<43) != 0 {
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return 43
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} else if x[0]&(1<<44) != 0 {
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return 44
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} else if x[0]&(1<<45) != 0 {
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return 45
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} else if x[0]&(1<<46) != 0 {
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return 46
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} else if x[0]&(1<<47) != 0 {
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return 47
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} else if x[0]&(1<<48) != 0 {
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return 48
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} else if x[0]&(1<<49) != 0 {
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return 49
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} else if x[0]&(1<<50) != 0 {
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return 50
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} else if x[0]&(1<<51) != 0 {
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return 51
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} else if x[0]&(1<<52) != 0 {
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return 52
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} else if x[0]&(1<<53) != 0 {
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return 53
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} else if x[0]&(1<<54) != 0 {
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return 54
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} else if x[0]&(1<<55) != 0 {
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return 55
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} else if x[0]&(1<<56) != 0 {
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return 56
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} else if x[0]&(1<<57) != 0 {
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return 57
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} else if x[0]&(1<<58) != 0 {
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return 58
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} else if x[0]&(1<<59) != 0 {
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return 59
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} else if x[0]&(1<<60) != 0 {
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return 60
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} else if x[0]&(1<<61) != 0 {
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return 61
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} else if x[0]&(1<<62) != 0 {
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return 62
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} else if x[0]&(1<<63) != 0 {
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return 63
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} else if x[1]&(1<<0) != 0 {
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return 64
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} else if x[1]&(1<<1) != 0 {
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return 65
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} else if x[1]&(1<<2) != 0 {
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return 66
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} else if x[1]&(1<<3) != 0 {
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return 67
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} else if x[1]&(1<<4) != 0 {
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return 68
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} else if x[1]&(1<<5) != 0 {
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return 69
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} else if x[1]&(1<<6) != 0 {
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return 70
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} else if x[1]&(1<<7) != 0 {
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return 71
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} else if x[1]&(1<<8) != 0 {
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return 72
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} else if x[1]&(1<<9) != 0 {
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return 73
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} else if x[1]&(1<<10) != 0 {
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return 74
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} else if x[1]&(1<<11) != 0 {
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return 75
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} else if x[1]&(1<<12) != 0 {
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return 76
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} else if x[1]&(1<<13) != 0 {
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return 77
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} else if x[1]&(1<<14) != 0 {
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return 78
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} else if x[1]&(1<<15) != 0 {
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return 79
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} else if x[1]&(1<<16) != 0 {
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return 80
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} else if x[1]&(1<<17) != 0 {
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return 81
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} else if x[1]&(1<<18) != 0 {
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return 82
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} else if x[1]&(1<<19) != 0 {
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return 83
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} else if x[1]&(1<<20) != 0 {
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return 84
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} else if x[1]&(1<<21) != 0 {
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return 85
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} else if x[1]&(1<<22) != 0 {
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return 86
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} else if x[1]&(1<<23) != 0 {
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return 87
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} else if x[1]&(1<<24) != 0 {
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return 88
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} else if x[1]&(1<<25) != 0 {
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return 89
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} else if x[1]&(1<<26) != 0 {
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return 90
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} else if x[1]&(1<<27) != 0 {
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return 91
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} else if x[1]&(1<<28) != 0 {
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return 92
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} else if x[1]&(1<<29) != 0 {
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return 93
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} else if x[1]&(1<<30) != 0 {
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return 94
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} else if x[1]&(1<<31) != 0 {
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return 95
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} else if x[1]&(1<<32) != 0 {
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return 96
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} else if x[1]&(1<<33) != 0 {
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return 97
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} else if x[1]&(1<<34) != 0 {
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return 98
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} else if x[1]&(1<<35) != 0 {
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return 99
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} else if x[1]&(1<<36) != 0 {
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return 100
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} else if x[1]&(1<<37) != 0 {
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return 101
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} else if x[1]&(1<<38) != 0 {
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return 102
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} else if x[1]&(1<<39) != 0 {
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return 103
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} else if x[1]&(1<<40) != 0 {
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return 104
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} else if x[1]&(1<<41) != 0 {
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return 105
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} else if x[1]&(1<<42) != 0 {
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return 106
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} else if x[1]&(1<<43) != 0 {
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return 107
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} else if x[1]&(1<<44) != 0 {
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return 108
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} else if x[1]&(1<<45) != 0 {
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return 109
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} else if x[1]&(1<<46) != 0 {
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return 110
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} else if x[1]&(1<<47) != 0 {
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return 111
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} else if x[1]&(1<<48) != 0 {
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return 112
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} else if x[1]&(1<<49) != 0 {
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return 113
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} else if x[1]&(1<<50) != 0 {
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return 114
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} else if x[1]&(1<<51) != 0 {
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return 115
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} else if x[1]&(1<<52) != 0 {
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return 116
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} else if x[1]&(1<<53) != 0 {
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return 117
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} else if x[1]&(1<<54) != 0 {
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return 118
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} else if x[1]&(1<<55) != 0 {
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return 119
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} else if x[1]&(1<<56) != 0 {
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return 120
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} else if x[1]&(1<<57) != 0 {
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return 121
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} else if x[1]&(1<<58) != 0 {
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return 122
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} else if x[1]&(1<<59) != 0 {
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return 123
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} else if x[1]&(1<<60) != 0 {
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return 124
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} else if x[1]&(1<<61) != 0 {
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return 125
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} else if x[1]&(1<<62) != 0 {
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return 126
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} else if x[1]&(1<<63) != 0 {
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return 127
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} else if x[2]&(1<<0) != 0 {
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return 128
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} else if x[2]&(1<<1) != 0 {
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return 129
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} else if x[2]&(1<<2) != 0 {
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return 130
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} else if x[2]&(1<<3) != 0 {
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return 131
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} else if x[2]&(1<<4) != 0 {
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return 132
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} else if x[2]&(1<<5) != 0 {
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return 133
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} else if x[2]&(1<<6) != 0 {
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return 134
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} else if x[2]&(1<<7) != 0 {
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return 135
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} else if x[2]&(1<<8) != 0 {
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return 136
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} else if x[2]&(1<<9) != 0 {
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return 137
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} else if x[2]&(1<<10) != 0 {
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return 138
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} else if x[2]&(1<<11) != 0 {
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return 139
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} else if x[2]&(1<<12) != 0 {
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return 140
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} else if x[2]&(1<<13) != 0 {
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return 141
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} else if x[2]&(1<<14) != 0 {
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return 142
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} else if x[2]&(1<<15) != 0 {
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return 143
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} else if x[2]&(1<<16) != 0 {
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return 144
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} else if x[2]&(1<<17) != 0 {
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return 145
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} else if x[2]&(1<<18) != 0 {
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return 146
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} else if x[2]&(1<<19) != 0 {
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return 147
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} else if x[2]&(1<<20) != 0 {
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return 148
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} else if x[2]&(1<<21) != 0 {
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return 149
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} else if x[2]&(1<<22) != 0 {
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return 150
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} else if x[2]&(1<<23) != 0 {
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return 151
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} else if x[2]&(1<<24) != 0 {
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return 152
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} else if x[2]&(1<<25) != 0 {
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return 153
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} else if x[2]&(1<<26) != 0 {
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return 154
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} else if x[2]&(1<<27) != 0 {
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return 155
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} else if x[2]&(1<<28) != 0 {
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return 156
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} else if x[2]&(1<<29) != 0 {
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return 157
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} else if x[2]&(1<<30) != 0 {
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return 158
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} else if x[2]&(1<<31) != 0 {
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return 159
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} else if x[2]&(1<<32) != 0 {
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return 160
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} else if x[2]&(1<<33) != 0 {
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return 161
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} else if x[2]&(1<<34) != 0 {
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return 162
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} else if x[2]&(1<<35) != 0 {
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return 163
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} else if x[2]&(1<<36) != 0 {
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return 164
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} else if x[2]&(1<<37) != 0 {
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return 165
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} else if x[2]&(1<<38) != 0 {
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return 166
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} else if x[2]&(1<<39) != 0 {
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return 167
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} else if x[2]&(1<<40) != 0 {
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return 168
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} else if x[2]&(1<<41) != 0 {
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return 169
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} else if x[2]&(1<<42) != 0 {
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return 170
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} else if x[2]&(1<<43) != 0 {
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return 171
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} else if x[2]&(1<<44) != 0 {
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return 172
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} else if x[2]&(1<<45) != 0 {
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return 173
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} else if x[2]&(1<<46) != 0 {
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return 174
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} else if x[2]&(1<<47) != 0 {
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return 175
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} else if x[2]&(1<<48) != 0 {
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return 176
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} else if x[2]&(1<<49) != 0 {
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return 177
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} else if x[2]&(1<<50) != 0 {
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return 178
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} else if x[2]&(1<<51) != 0 {
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return 179
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} else if x[2]&(1<<52) != 0 {
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return 180
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} else if x[2]&(1<<53) != 0 {
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return 181
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} else if x[2]&(1<<54) != 0 {
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return 182
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} else if x[2]&(1<<55) != 0 {
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return 183
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} else if x[2]&(1<<56) != 0 {
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return 184
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} else if x[2]&(1<<57) != 0 {
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return 185
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} else if x[2]&(1<<58) != 0 {
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return 186
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} else if x[2]&(1<<59) != 0 {
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return 187
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} else if x[2]&(1<<60) != 0 {
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return 188
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} else if x[2]&(1<<61) != 0 {
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return 189
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} else if x[2]&(1<<62) != 0 {
|
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return 190
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} else if x[2]&(1<<63) != 0 {
|
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return 191
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} else if x[3]&(1<<0) != 0 {
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return 192
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} else if x[3]&(1<<1) != 0 {
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return 193
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} else if x[3]&(1<<2) != 0 {
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return 194
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} else if x[3]&(1<<3) != 0 {
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return 195
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} else if x[3]&(1<<4) != 0 {
|
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return 196
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} else if x[3]&(1<<5) != 0 {
|
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return 197
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} else if x[3]&(1<<6) != 0 {
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return 198
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} else if x[3]&(1<<7) != 0 {
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return 199
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} else if x[3]&(1<<8) != 0 {
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return 200
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} else if x[3]&(1<<9) != 0 {
|
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return 201
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} else if x[3]&(1<<10) != 0 {
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return 202
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} else if x[3]&(1<<11) != 0 {
|
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return 203
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} else if x[3]&(1<<12) != 0 {
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return 204
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} else if x[3]&(1<<13) != 0 {
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return 205
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} else if x[3]&(1<<14) != 0 {
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return 206
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} else if x[3]&(1<<15) != 0 {
|
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return 207
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} else if x[3]&(1<<16) != 0 {
|
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return 208
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} else if x[3]&(1<<17) != 0 {
|
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return 209
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} else if x[3]&(1<<18) != 0 {
|
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return 210
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} else if x[3]&(1<<19) != 0 {
|
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return 211
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} else if x[3]&(1<<20) != 0 {
|
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return 212
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} else if x[3]&(1<<21) != 0 {
|
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return 213
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} else if x[3]&(1<<22) != 0 {
|
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return 214
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} else if x[3]&(1<<23) != 0 {
|
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return 215
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} else if x[3]&(1<<24) != 0 {
|
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return 216
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} else if x[3]&(1<<25) != 0 {
|
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return 217
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} else if x[3]&(1<<26) != 0 {
|
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return 218
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} else if x[3]&(1<<27) != 0 {
|
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return 219
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} else if x[3]&(1<<28) != 0 {
|
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return 220
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} else if x[3]&(1<<29) != 0 {
|
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return 221
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} else if x[3]&(1<<30) != 0 {
|
|
return 222
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} else if x[3]&(1<<31) != 0 {
|
|
return 223
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|
} else if x[3]&(1<<32) != 0 {
|
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return 224
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} else if x[3]&(1<<33) != 0 {
|
|
return 225
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} else if x[3]&(1<<34) != 0 {
|
|
return 226
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} else if x[3]&(1<<35) != 0 {
|
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return 227
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} else if x[3]&(1<<36) != 0 {
|
|
return 228
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} else if x[3]&(1<<37) != 0 {
|
|
return 229
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} else if x[3]&(1<<38) != 0 {
|
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return 230
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} else if x[3]&(1<<39) != 0 {
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return 231
|
|
} else if x[3]&(1<<40) != 0 {
|
|
return 232
|
|
} else if x[3]&(1<<41) != 0 {
|
|
return 233
|
|
} else if x[3]&(1<<42) != 0 {
|
|
return 234
|
|
} else if x[3]&(1<<43) != 0 {
|
|
return 235
|
|
} else if x[3]&(1<<44) != 0 {
|
|
return 236
|
|
} else if x[3]&(1<<45) != 0 {
|
|
return 237
|
|
} else if x[3]&(1<<46) != 0 {
|
|
return 238
|
|
} else if x[3]&(1<<47) != 0 {
|
|
return 239
|
|
} else if x[3]&(1<<48) != 0 {
|
|
return 240
|
|
} else if x[3]&(1<<49) != 0 {
|
|
return 241
|
|
} else if x[3]&(1<<50) != 0 {
|
|
return 242
|
|
} else if x[3]&(1<<51) != 0 {
|
|
return 243
|
|
} else if x[3]&(1<<52) != 0 {
|
|
return 244
|
|
} else if x[3]&(1<<53) != 0 {
|
|
return 245
|
|
} else if x[3]&(1<<54) != 0 {
|
|
return 246
|
|
} else if x[3]&(1<<55) != 0 {
|
|
return 247
|
|
} else if x[3]&(1<<56) != 0 {
|
|
return 248
|
|
} else if x[3]&(1<<57) != 0 {
|
|
return 249
|
|
} else if x[3]&(1<<58) != 0 {
|
|
return 250
|
|
} else if x[3]&(1<<59) != 0 {
|
|
return 251
|
|
} else if x[3]&(1<<60) != 0 {
|
|
return 252
|
|
} else if x[3]&(1<<61) != 0 {
|
|
return 253
|
|
} else if x[3]&(1<<62) != 0 {
|
|
return 254
|
|
} else if x[3]&(1<<63) != 0 {
|
|
return 255
|
|
}
|
|
return -1
|
|
}
|
|
|
|
func main() {
|
|
const ones = ^uint64(0)
|
|
for i := 0; i < 256; i++ {
|
|
bits := [4]uint64{ones, ones, ones, ones}
|
|
|
|
// clear bottom i bits
|
|
bits[i/64] ^= 1<<(uint(i)&63) - 1
|
|
for j := i/64 - 1; j >= 0; j-- {
|
|
bits[j] = 0
|
|
}
|
|
|
|
k := test(bits)
|
|
if k != i {
|
|
print("test(bits)=", k, " want ", i, "\n")
|
|
panic("failed")
|
|
}
|
|
}
|
|
}
|