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[dev.power64] 6g: don't create variables for indirect addresses

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Previously, mkvar treated, for example, 0(AX) the same as AX.
As a result, a move to an indirect address would be marked as
*setting* the register, rather than just using it, resulting
in unnecessary register moves.  Fix this by not producing
variables for indirect addresses.

LGTM=rsc
R=rsc, dave
CC=golang-codereviews
https://golang.org/cl/164610043
This commit is contained in:
Austin Clements 2014-11-05 15:36:47 -05:00
parent fa32e922d5
commit 4f81684f86
1 changed files with 3 additions and 0 deletions
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3
src/cmd/6g/reg.c
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@ -621,6 +621,9 @@ mkvar(Reg *r, Adr *a)
if(r != R) if(r != R)
r->use1.b[0] |= doregbits(a->index); r->use1.b[0] |= doregbits(a->index);
if(t >= D_INDIR && t < 2*D_INDIR)
goto none;
switch(t) { switch(t) {
default: default:
regu = doregbits(t); regu = doregbits(t);