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stop the 5c optimizer from clobbering extern static registers.

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R=rsc, ken2
CC=golang-dev
https://golang.org/cl/204064
This commit is contained in:
Kai Backman 2010-02-10 22:42:05 -08:00
parent 22a7f2a14d
commit 494bcc80e4
1 changed files with 6 additions and 2 deletions
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8
src/cmd/5c/reg.c
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@ -79,6 +79,10 @@ regopt(Prog *p)
Reg* p;
} log5[6], *lp;
// TODO(kaib): optimizer disabled because it smashes R8 when running out of registers
// the disable is unconventionally here because the call is in common code shared by 5c/6c/8c
return;
firstr = R;
lastr = R;
nvar = 0;
@ -1147,7 +1151,7 @@ int32
RtoB(int r)
{
if(r < 2 || r >= REGTMP)
if(r < 2 || r >= REGTMP-2) // excluded R9 and R10 for m and g
return 0;
return 1L << r;
}
@ -1155,7 +1159,7 @@ RtoB(int r)
int
BtoR(int32 b)
{
b &= 0x07fcL;
b &= 0x01fcL; // excluded R9 and R10 for m and g
if(b == 0)
return 0;
return bitno(b);