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runtime: don't use CMOV for 386

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CMOVs were not introduced until P6.  We need 386 to run on
Pentium MMX.

Fixes #13923

Change-Id: Iee9572cd83e64c3a1336bc1e6b300b048fbcc996
Reviewed-on: https://go-review.googlesource.com/18621
Reviewed-by: Minux Ma <minux@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
This commit is contained in:
Keith Randall 2016-01-13 13:09:46 -08:00
parent 608ddc38bd
commit 8c9ef9dd0a
1 changed files with 4 additions and 2 deletions
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6
src/runtime/asm_386.s
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@ -1439,7 +1439,8 @@ TEXT strings·IndexByte(SB),NOSPLIT,$0-16
TEXT runtime·cmpbody(SB),NOSPLIT,$0-0 TEXT runtime·cmpbody(SB),NOSPLIT,$0-0
MOVL DX, BP MOVL DX, BP
SUBL BX, DX // DX = blen-alen SUBL BX, DX // DX = blen-alen
CMOVLGT BX, BP // BP = min(alen, blen) JLE 2(PC)
MOVL BX, BP // BP = min(alen, blen)
CMPL SI, DI CMPL SI, DI
JEQ allsame JEQ allsame
CMPL BP, $4 CMPL BP, $4
@ -1558,7 +1559,8 @@ TEXT runtime·fastrand1(SB), NOSPLIT, $0-4
ADDL DX, DX ADDL DX, DX
MOVL DX, BX MOVL DX, BX
XORL $0x88888eef, DX XORL $0x88888eef, DX
CMOVLMI BX, DX JPL 2(PC)
MOVL BX, DX
MOVL DX, m_fastrand(AX) MOVL DX, m_fastrand(AX)
MOVL DX, ret+0(FP) MOVL DX, ret+0(FP)
RET RET