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cmd/internal/obj/x86: fix doubled REX byte in POPCNT, others 

Tests for this and many other instructions are in a separate followup CL.

For #14068.

Change-Id: I6955315996a34d7fb79369b9d9a0119d11745e85
Reviewed-on: https://go-review.googlesource.com/18849
Reviewed-by: Rob Pike <r@golang.org>
This commit is contained in:
Russ Cox 2016-01-22 15:50:01 -05:00
parent f844b0be18
commit d3ff40fb1f
1 changed files with 4 additions and 8 deletions
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12
src/cmd/internal/obj/x86/asm6.go
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@ -3189,12 +3189,10 @@ func doasm(ctxt *obj.Link, p *obj.Prog) {
ctxt.Andptr[0] = Pm
ctxt.Andptr = ctxt.Andptr[1:]
case Pq3: /* 16 bit escape, Rex.w, and opcode escape */
case Pq3: /* 16 bit escape and opcode escape + REX.W */
ctxt.Rexflag |= Pw
ctxt.Andptr[0] = Pe
ctxt.Andptr = ctxt.Andptr[1:]
ctxt.Andptr[0] = Pw
ctxt.Andptr = ctxt.Andptr[1:]
ctxt.Andptr[0] = Pm
ctxt.Andptr = ctxt.Andptr[1:]
@ -3206,12 +3204,10 @@ func doasm(ctxt *obj.Link, p *obj.Prog) {
ctxt.Andptr[0] = Pm
ctxt.Andptr = ctxt.Andptr[1:]
case Pfw: /* first escape, Rex.w, and second escape */
case Pfw: /* xmm opcode escape + REX.W */
ctxt.Rexflag |= Pw
ctxt.Andptr[0] = Pf3
ctxt.Andptr = ctxt.Andptr[1:]
ctxt.Andptr[0] = Pw
ctxt.Andptr = ctxt.Andptr[1:]
ctxt.Andptr[0] = Pm
ctxt.Andptr = ctxt.Andptr[1:]