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fix tst instruction on arm to set overflow bit

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R=r
CC=golang-dev
https://golang.org/cl/4009041
This commit is contained in:
Ken Thompson 2011-01-13 20:05:08 -08:00
parent d9ffbc4b3d
commit a093f3d5a0
2 changed files with 5 additions and 5 deletions
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2
src/cmd/5g/cgen.c
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@ -832,7 +832,7 @@ gencmp0(Node *n, Type *t, int o, Prog *to)
} else
gins(ATST, &n1, N);
a = optoas(o, t);
patch(gbranch(optoas(o, t), t), to);
patch(gbranch(a, t), to);
regfree(&n1);
}

8
src/cmd/5l/asm.c
View File

@ -1559,11 +1559,9 @@ if(debug['G']) print("%ux: %s: arm %d %d %d\n", (uint32)(p->pc), p->from.sym->na
o1 |= (p->from.reg<<16);
o1 |= (p->to.reg<<12);
break;
case 90: /* tst reg */
o1 = oprrr(AMOVW, p->scond);
o1 |= p->from.reg | (p->from.reg<<12);
o1 |= 1 << 20; // SBIT
o1 = oprrr(ACMP+AEND, p->scond);
o1 |= p->from.reg<<16;
break;
}
@ -1716,6 +1714,8 @@ oprrr(int a, int sc)
return o | (0xe<<24) | (0x0<<20) | (0xb<<8) | (1<<4);
case AMOVFW+AEND: // copy FtoW
return o | (0xe<<24) | (0x1<<20) | (0xb<<8) | (1<<4);
case ACMP+AEND: // cmp imm
return o | (0x3<<24) | (0x5<<20);
}
diag("bad rrr %d", a);
prasm(curp);