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Cleaned up AArch64 RAPass to not shadow variables in _rewrite() (Fixes #359)

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kobalicek
2022-04-01 00:41:54 +02:00
parent 7342f7d78d
commit e41f1c0fd7
1 changed files with 36 additions and 34 deletions
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40
src/asmjit/arm/a64rapass.cpp
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@@ -713,40 +713,45 @@ ASMJIT_FAVOR_SPEED Error ARMRAPass::_rewrite(BaseNode* first, BaseNode* stop) no
mem.clearRegHome();
mem.addOffsetLo32(offset);
}
}
}
// Rewrite `loadAddressOf()` construct.
if (node->type() == NodeType::kInst) {
InstNode* inst = node->as<InstNode>();
if (inst->realId() == Inst::kIdAdr && inst->opCount() == 2) {
if (inst->realId() == Inst::kIdAdr && inst->opCount() == 2 && inst->op(1).isMem()) {
BaseMem mem = inst->op(1).as<BaseMem>();
int64_t offset = mem.offset();
if (!mem.hasBase()) {
if (!mem.hasBaseOrIndex()) {
inst->setId(Inst::kIdMov);
inst->setOp(1, Imm(offset));
}
else {
InstId op = offset < 0 ? Inst::kIdSub : Inst::kIdAdd;
uint64_t val = offset < 0 ? Support::neg(uint64_t(offset)) : uint64_t(offset);
if (mem.hasIndex())
return DebugUtils::errored(kErrorInvalidAddressIndex);
GpX base = GpX(mem.baseId());
GpX dst(inst->op(0).as<Gp>().id());
GpX base(mem.baseId());
inst->setId(op);
InstId arithInstId = offset < 0 ? Inst::kIdSub : Inst::kIdAdd;
uint64_t absOffset = offset < 0 ? Support::neg(uint64_t(offset)) : uint64_t(offset);
inst->setId(arithInstId);
inst->setOpCount(3);
inst->setOp(1, base);
inst->setOp(2, Imm(val));
inst->setOp(2, Imm(absOffset));
if (val > 0xFFFu && (val & ~uint64_t(0xFFF000u)) != 0) {
const Operand_& dst = inst->op(0);
// Use two operations if the stack address is greater than 4095.
if (val <= 0xFFFFFFu) {
// Use two operations if the offset cannot be encoded with ADD/SUB.
if (absOffset > 0xFFFu && (absOffset & ~uint64_t(0xFFF000u)) != 0) {
if (absOffset <= 0xFFFFFFu) {
cc()->_setCursor(inst->prev());
cc()->_emitI(op, dst, base, Imm(val & 0xFFFu));
ASMJIT_PROPAGATE(cc()->emit(arithInstId, dst, base, Imm(absOffset & 0xFFFu)));
inst->setOp(1, dst);
inst->setOp(2, Imm(val & 0xFFF000u));
inst->setOp(2, Imm(absOffset & 0xFFF000u));
}
else {
cc()->_setCursor(inst->prev());
cc()->_emitI(Inst::kIdMov, inst->op(0), Imm(val));
ASMJIT_PROPAGATE(cc()->emit(Inst::kIdMov, inst->op(0), Imm(absOffset)));
inst->setOp(1, base);
inst->setOp(2, dst);
@@ -755,9 +760,6 @@ ASMJIT_FAVOR_SPEED Error ARMRAPass::_rewrite(BaseNode* first, BaseNode* stop) no
}
}
}
}
}
}
node = next;
}