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Merge pull request #298 from redstar/bitops

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Fix big-endian code generation for btc, btr and bts.
This commit is contained in:
David Nadlinger
2013-03-04 09:51:22 -08:00
parent 5a9336bf25 1ab2204e0b
commit 10bc3fd52b
1 changed files with 8 additions and 6 deletions
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14
gen/toir.cpp
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@@ -1096,12 +1096,14 @@ DValue* CallExp::toElem(IRState* p)
LLValue* ptr = exp1->toElem(p)->getRVal();
LLValue* bitnum = exp2->toElem(p)->getRVal();
// auto q = cast(ubyte*)ptr + (bitnum >> 3);
LLValue* q = DtoBitCast(ptr, DtoType(Type::tuns8->pointerTo()));
q = DtoGEP1(q, p->ir->CreateLShr(bitnum, 3), "bitop.q");
unsigned bitmask = DtoSize_t()->getBitWidth() - 1;
assert(bitmask == 31 || bitmask == 63);
// auto q = cast(size_t*)ptr + (bitnum >> (64bit ? 6 : 5));
LLValue* q = DtoBitCast(ptr, DtoSize_t()->getPointerTo());
q = DtoGEP1(q, p->ir->CreateLShr(bitnum, bitmask == 63 ? 6 : 5), "bitop.q");
// auto mask = 1 << (bitnum & 7);
LLValue* mask = p->ir->CreateAnd(bitnum, DtoConstSize_t(7), "bitop.tmp");
// auto mask = 1 << (bitnum & bitmask);
LLValue* mask = p->ir->CreateAnd(bitnum, DtoConstSize_t(bitmask), "bitop.tmp");
mask = p->ir->CreateShl(DtoConstSize_t(1), mask, "bitop.mask");
// auto result = (*q & mask) ? -1 : 0;
@@ -1127,7 +1129,7 @@ DValue* CallExp::toElem(IRState* p)
}
LLValue *newVal = p->ir->CreateBinOp(op, val, mask, "bitop.new_val");
newVal = p->ir->CreateTrunc(newVal, DtoType(Type::tuns8), "bitop.tmp");
newVal = p->ir->CreateTrunc(newVal, DtoSize_t(), "bitop.tmp");
DtoStore(newVal, q);
}