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liblink: shorter encoding for zeroing register

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Encode MOV $0, %ax as XOR %eax, %eax instead of
XOR %rax, %rax. If an operand register does not
need REX.w bit (i.e. not one of R8-R15), it is
encoded in 2 bytes instead of 3 bytes.

LGTM=rsc
R=golang-codereviews, gobot, rsc
CC=golang-codereviews
https://golang.org/cl/115580044
This commit is contained in:
Rui Ueyama 2014-08-05 21:10:07 -07:00
parent 0da4b2dbc2
commit 24db881689
1 changed files with 1 additions and 0 deletions
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src/liblink/asm6.c
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@ -3066,6 +3066,7 @@ found:
break; break;
case Zclr: case Zclr:
ctxt->rexflag &= ~Pw;
*ctxt->andptr++ = op; *ctxt->andptr++ = op;
asmand(ctxt, &p->to, &p->to); asmand(ctxt, &p->to, &p->to);
break; break;