runtime: don't use CMOV for 386

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 <[email protected]> Run-TryBot: Brad Fitzpatrick <[email protected]>
cloudflare · Jan 13, 2016 · 8c9ef9d · 8c9ef9d
1 parent 608ddc3
commit 8c9ef9d
Showing 1 changed file with 4 additions and 2 deletions.
diff --git a/src/runtime/asm_386.s b/src/runtime/asm_386.s
@@ -1439,7 +1439,8 @@ TEXT strings·IndexByte(SB),NOSPLIT,$0-16
 TEXT runtime·cmpbody(SB),NOSPLIT,$0-0
  MOVL DX, BP
  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
  JEQ allsame
  CMPL BP, $4
@@ -1558,7 +1559,8 @@ TEXT runtime·fastrand1(SB), NOSPLIT, $0-4
  ADDL DX, DX
  MOVL DX, BX
  XORL $0x88888eef, DX
- CMOVLMI BX, DX
+ JPL 2(PC)
+ MOVL BX, DX
  MOVL DX, m_fastrand(AX)
  MOVL DX, ret+0(FP)
  RET