mirror of
https://github.com/golang/go
synced 2024-11-26 10:28:19 -07:00
0b2353edcb
Compiling expressions like:
s[s[s[s[s[s[s[s[s[s[s[s[i]]]]]]]]]]]]
make 5g and 6g run out of registers. Such expressions can arise
if a slice is used to represent a permutation and the user wants
to iterate it.
This is due to the usual problem of allocating registers before
going down the expression tree, instead of allocating them in a
postfix way.
The functions cgenr and agenr (that generate a value to a newly
allocated register instead of an existing location), are either
introduced or modified when they already existed to allocate
the new register as late as possible, and sudoaddable is disabled
for OINDEX nodes so that igen/agenr is used instead.
Update #4207.
R=dave, daniel.morsing, rsc
CC=golang-dev
https://golang.org/cl/6733055
337 lines
7.5 KiB
Go
337 lines
7.5 KiB
Go
// compile
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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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// Various tests for expressions with high complexity.
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package main
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// Concatenate 16 4-bit integers into a 64-bit number.
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func concat(s *[16]byte) uint64 {
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r := (((((((((((((((uint64(s[0])<<4|
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uint64(s[1]))<<4|
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uint64(s[2]))<<4|
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uint64(s[3]))<<4|
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uint64(s[4]))<<4|
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uint64(s[5]))<<4|
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uint64(s[6]))<<4|
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uint64(s[7]))<<4|
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uint64(s[8]))<<4|
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uint64(s[9]))<<4|
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uint64(s[10]))<<4|
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uint64(s[11]))<<4|
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uint64(s[12]))<<4|
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uint64(s[13]))<<4|
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uint64(s[14]))<<4 |
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uint64(s[15]))
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return r
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}
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// Compute the determinant of a 4x4-matrix by the sum
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// over all index permutations.
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func determinant(m [4][4]float64) float64 {
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return m[0][0]*m[1][1]*m[2][2]*m[3][3] -
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m[0][0]*m[1][1]*m[2][3]*m[3][2] -
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m[0][0]*m[1][2]*m[2][1]*m[3][3] +
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m[0][0]*m[1][2]*m[2][3]*m[3][1] +
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m[0][0]*m[1][3]*m[2][1]*m[3][2] -
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m[0][0]*m[1][3]*m[2][2]*m[3][1] -
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m[0][1]*m[1][0]*m[2][2]*m[3][3] +
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m[0][1]*m[1][0]*m[2][3]*m[3][2] +
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m[0][1]*m[1][2]*m[2][0]*m[3][3] -
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m[0][1]*m[1][2]*m[2][3]*m[3][0] -
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m[0][1]*m[1][3]*m[2][0]*m[3][2] +
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m[0][1]*m[1][3]*m[2][2]*m[3][0] +
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m[0][2]*m[1][0]*m[2][1]*m[3][3] -
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m[0][2]*m[1][0]*m[2][3]*m[3][1] -
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m[0][2]*m[1][1]*m[2][0]*m[3][3] +
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m[0][2]*m[1][1]*m[2][3]*m[3][0] +
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m[0][2]*m[1][3]*m[2][0]*m[3][1] -
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m[0][2]*m[1][3]*m[2][1]*m[3][0] -
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m[0][3]*m[1][0]*m[2][1]*m[3][2] +
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m[0][3]*m[1][0]*m[2][2]*m[3][1] +
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m[0][3]*m[1][1]*m[2][0]*m[3][2] -
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m[0][3]*m[1][1]*m[2][2]*m[3][0] -
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m[0][3]*m[1][2]*m[2][0]*m[3][1] +
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m[0][3]*m[1][2]*m[2][1]*m[3][0]
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}
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// Compute the determinant of a 4x4-matrix by the sum
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// over all index permutations.
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func determinantInt(m [4][4]int) int {
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return m[0][0]*m[1][1]*m[2][2]*m[3][3] -
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m[0][0]*m[1][1]*m[2][3]*m[3][2] -
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m[0][0]*m[1][2]*m[2][1]*m[3][3] +
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m[0][0]*m[1][2]*m[2][3]*m[3][1] +
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m[0][0]*m[1][3]*m[2][1]*m[3][2] -
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m[0][0]*m[1][3]*m[2][2]*m[3][1] -
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m[0][1]*m[1][0]*m[2][2]*m[3][3] +
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m[0][1]*m[1][0]*m[2][3]*m[3][2] +
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m[0][1]*m[1][2]*m[2][0]*m[3][3] -
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m[0][1]*m[1][2]*m[2][3]*m[3][0] -
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m[0][1]*m[1][3]*m[2][0]*m[3][2] +
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m[0][1]*m[1][3]*m[2][2]*m[3][0] +
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m[0][2]*m[1][0]*m[2][1]*m[3][3] -
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m[0][2]*m[1][0]*m[2][3]*m[3][1] -
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m[0][2]*m[1][1]*m[2][0]*m[3][3] +
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m[0][2]*m[1][1]*m[2][3]*m[3][0] +
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m[0][2]*m[1][3]*m[2][0]*m[3][1] -
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m[0][2]*m[1][3]*m[2][1]*m[3][0] -
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m[0][3]*m[1][0]*m[2][1]*m[3][2] +
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m[0][3]*m[1][0]*m[2][2]*m[3][1] +
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m[0][3]*m[1][1]*m[2][0]*m[3][2] -
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m[0][3]*m[1][1]*m[2][2]*m[3][0] -
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m[0][3]*m[1][2]*m[2][0]*m[3][1] +
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m[0][3]*m[1][2]*m[2][1]*m[3][0]
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}
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// Compute the determinant of a 4x4-matrix by the sum
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// over all index permutations.
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func determinantByte(m [4][4]byte) byte {
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return m[0][0]*m[1][1]*m[2][2]*m[3][3] -
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m[0][0]*m[1][1]*m[2][3]*m[3][2] -
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m[0][0]*m[1][2]*m[2][1]*m[3][3] +
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m[0][0]*m[1][2]*m[2][3]*m[3][1] +
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m[0][0]*m[1][3]*m[2][1]*m[3][2] -
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m[0][0]*m[1][3]*m[2][2]*m[3][1] -
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m[0][1]*m[1][0]*m[2][2]*m[3][3] +
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m[0][1]*m[1][0]*m[2][3]*m[3][2] +
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m[0][1]*m[1][2]*m[2][0]*m[3][3] -
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m[0][1]*m[1][2]*m[2][3]*m[3][0] -
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m[0][1]*m[1][3]*m[2][0]*m[3][2] +
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m[0][1]*m[1][3]*m[2][2]*m[3][0] +
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m[0][2]*m[1][0]*m[2][1]*m[3][3] -
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m[0][2]*m[1][0]*m[2][3]*m[3][1] -
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m[0][2]*m[1][1]*m[2][0]*m[3][3] +
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m[0][2]*m[1][1]*m[2][3]*m[3][0] +
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m[0][2]*m[1][3]*m[2][0]*m[3][1] -
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m[0][2]*m[1][3]*m[2][1]*m[3][0] -
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m[0][3]*m[1][0]*m[2][1]*m[3][2] +
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m[0][3]*m[1][0]*m[2][2]*m[3][1] +
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m[0][3]*m[1][1]*m[2][0]*m[3][2] -
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m[0][3]*m[1][1]*m[2][2]*m[3][0] -
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m[0][3]*m[1][2]*m[2][0]*m[3][1] +
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m[0][3]*m[1][2]*m[2][1]*m[3][0]
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}
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type A []A
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// A sequence of constant indexings.
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func IndexChain1(s A) A {
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return s[0][0][0][0][0][0][0][0][0][0][0][0][0][0][0][0]
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}
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// A sequence of non-constant indexings.
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func IndexChain2(s A, i int) A {
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return s[i][i][i][i][i][i][i][i][i][i][i][i][i][i][i][i]
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}
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// Another sequence of indexings.
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func IndexChain3(s []int) int {
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return s[s[s[s[s[s[s[s[s[s[s[s[s[s[s[s[s[s[s[s[s[0]]]]]]]]]]]]]]]]]]]]]
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}
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// A right-leaning tree of byte multiplications.
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func righttree(a, b, c, d uint8) uint8 {
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return a * (b * (c * (d *
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(a * (b * (c * (d *
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(a * (b * (c * (d *
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(a * (b * (c * (d *
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(a * (b * (c * (d *
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a * (b * (c * d)))))))))))))))))))))
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}
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// A left-leaning tree of byte multiplications.
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func lefttree(a, b, c, d uint8) uint8 {
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return ((((((((((((((((((a * b) * c) * d *
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a) * b) * c) * d *
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a) * b) * c) * d *
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a) * b) * c) * d *
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a) * b) * c) * d *
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a) * b) * c) * d)
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}
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type T struct {
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Next I
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}
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type I interface{}
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// A chains of type assertions.
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func ChainT(t *T) *T {
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return t.
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Next.(*T).
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Next.(*T).
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Next.(*T).
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Next.(*T).
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Next.(*T).
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Next.(*T).
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Next.(*T).
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Next.(*T).
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Next.(*T).
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Next.(*T).
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Next.(*T).
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Next.(*T).
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Next.(*T).
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Next.(*T).
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Next.(*T).
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Next.(*T).
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Next.(*T).
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Next.(*T).
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Next.(*T).
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Next.(*T)
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}
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type U struct {
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Children []J
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}
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func (u *U) Child(n int) J { return u.Children[n] }
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type J interface {
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Child(n int) J
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}
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func ChainUAssert(u *U) *U {
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return u.Child(0).(*U).
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Child(0).(*U).
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Child(0).(*U).
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Child(0).(*U).
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Child(0).(*U).
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Child(0).(*U).
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Child(0).(*U).
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Child(0).(*U).
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Child(0).(*U).
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Child(0).(*U).
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Child(0).(*U).
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Child(0).(*U).
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Child(0).(*U).
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Child(0).(*U).
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Child(0).(*U).
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Child(0).(*U).
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Child(0).(*U).
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Child(0).(*U).
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Child(0).(*U).
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Child(0).(*U).
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Child(0).(*U).
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Child(0).(*U)
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}
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func ChainUNoAssert(u *U) *U {
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return u.Child(0).
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Child(0).
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Child(0).
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Child(0).
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Child(0).
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Child(0).
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Child(0).
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Child(0).
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Child(0).
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Child(0).
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Child(0).
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Child(0).
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Child(0).
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Child(0).
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Child(0).
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Child(0).
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Child(0).
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Child(0).
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Child(0).
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Child(0).
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Child(0).
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Child(0).(*U)
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}
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// Type assertions and slice indexing. See issue 4207.
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func ChainAssertIndex(u *U) J {
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return u.
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Children[0].(*U).
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Children[0].(*U).
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Children[0].(*U).
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Children[0].(*U).
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Children[0].(*U).
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Children[0].(*U).
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Children[0].(*U).
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Children[0].(*U).
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Children[0].(*U).
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Children[0].(*U).
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Children[0].(*U).
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Children[0].(*U).
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Children[0].(*U).
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Children[0]
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}
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type UArr struct {
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Children [2]J
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}
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func (u *UArr) Child(n int) J { return u.Children[n] }
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func ChainAssertArrayIndex(u *UArr) J {
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return u.
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Children[0].(*UArr).
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Children[0].(*UArr).
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Children[0].(*UArr).
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Children[0].(*UArr).
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Children[0].(*UArr).
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Children[0].(*UArr).
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Children[0].(*UArr).
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// Children[0].(*UArr).
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// Children[0].(*UArr).
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// Children[0].(*UArr).
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// Children[0].(*UArr).
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// Children[0].(*UArr).
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// Children[0].(*UArr).
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Children[0]
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}
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type UArrPtr struct {
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Children *[2]J
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}
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func (u *UArrPtr) Child(n int) J { return u.Children[n] }
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func ChainAssertArrayptrIndex(u *UArrPtr) J {
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// TODO: don't crash on longer chains.
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return u.
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Children[0].(*UArrPtr).
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Children[0].(*UArrPtr).
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Children[0].(*UArrPtr).
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Children[0].(*UArrPtr).
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// Children[0].(*UArrPtr).
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// Children[0].(*UArrPtr).
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// Children[0].(*UArrPtr).
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// Children[0].(*UArrPtr).
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// Children[0].(*UArrPtr).
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// Children[0].(*UArrPtr).
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// Children[0].(*UArrPtr).
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// Children[0].(*UArrPtr).
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// Children[0].(*UArrPtr).
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Children[0]
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}
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// Chains of divisions. See issue 4201.
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func ChainDiv(a, b int) int {
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return a / b / a / b / a / b / a / b /
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a / b / a / b / a / b / a / b /
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a / b / a / b / a / b / a / b
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}
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func ChainDivRight(a, b int) int {
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return a / (b / (a / (b /
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(a / (b / (a / (b /
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(a / (b / (a / (b /
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(a / (b / (a / (b /
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(a / (b / (a / b))))))))))))))))))
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}
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func ChainDivConst(a int) int {
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return a / 17 / 17 / 17 /
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17 / 17 / 17 / 17 /
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17 / 17 / 17 / 17
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}
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