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cmd/compile: repair MININT conversion bug in arm softfloat

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Negative-case conversion code was wrong for minimum int32,
used negate-then-widen instead of widen-then-negate.

Test already exists; this fixes the failure.

Fixes #15563.

Change-Id: I4b0b3ae8f2c9714bdcc405d4d0b1502ccfba2b40
Reviewed-on: https://go-review.googlesource.com/22830
Run-TryBot: David Chase <drchase@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
David Chase 2016-05-05 13:35:10 -07:00
parent 5f83bf6053
commit 6db98a3c51
1 changed files with 2 additions and 2 deletions
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4
src/runtime/softfloat_arm.go
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@ -530,7 +530,7 @@ execute:
case 0xeeb80ac0: // D[regd] = S[regm] (MOVWF)
cmp := int32(m.freglo[regm])
if cmp < 0 {
fputf(regd, f64to32(fintto64(int64(-cmp))))
fputf(regd, f64to32(fintto64(-int64(cmp))))
m.freglo[regd] ^= 0x80000000
} else {
fputf(regd, f64to32(fintto64(int64(cmp))))
@ -552,7 +552,7 @@ execute:
case 0xeeb80bc0: // D[regd] = S[regm] (MOVWD)
cmp := int32(m.freglo[regm])
if cmp < 0 {
fputd(regd, fintto64(int64(-cmp)))
fputd(regd, fintto64(-int64(cmp)))
m.freghi[regd] ^= 0x80000000
} else {
fputd(regd, fintto64(int64(cmp)))