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5c: dont substibute (destination) registers contained in MOVM reglist

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this fixes the miscompilation of 6l with 5c resulting in bogus
vlong -> long conversion at the top of asmandsz():

asmandsz 0x0000aec4	MOVW.W	R14,#-0x2c(R13)
asmandsz+0x4 0x0000aec8	MOVW	rex+8(FP),R5
asmandsz+0x8 0x0000aecc	MOVW	$andptr-SB(SB),R7
asmandsz+0xc 0x0000aed0	MOVW	R0,R6
asmandsz+0x10 0x0000aed4	AND	$#0x44,R5,R8
asmandsz+0x14 0x0000aed8	MOVW	R8,rex+8(FP)
asmandsz+0x18 0x0000aedc	MOVW	R0,R4
asmandsz+0x1c 0x0000aee0	MOVM.IA	(R0),[R1,R3] <- R1 used here
asmandsz+0x20 0x0000aee4	MOVW	R8,v-4(SP) <- substituted by R8
This commit is contained in:
cinap_lenrek 2019-03-29 06:35:41 +01:00
parent 99f79e390d
commit dea28126ae
1 changed files with 1 additions and 1 deletions
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2
sys/src/cmd/5c/peep.c
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@ -337,7 +337,7 @@ subprop(Reg *r0)
break;
case AMOVM:
t = 1<<v2->reg;
t = (1<<v1->reg) | (1<<v2->reg);
if((p->from.type == D_CONST && (p->from.offset&t)) ||
(p->to.type == D_CONST && (p->to.offset&t)))
return 0;