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x86_64: fix @bitCast when the operand dies

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This commit is contained in:
Jacob Young 2023-05-18 20:47:00 -04:00
parent 79bdd2bd63
commit 47405b1a1c
1 changed files with 12 additions and 8 deletions
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20
src/arch/x86_64/CodeGen.zig
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@ -10154,18 +10154,22 @@ fn airBitCast(self: *Self, inst: Air.Inst.Index) !void {
const dst_rc = regClassForType(dst_ty);
const src_rc = regClassForType(src_ty);
const src_mcv = try self.resolveInst(ty_op.operand);
if (dst_rc.supersetOf(src_rc) and self.reuseOperand(inst, ty_op.operand, 0, src_mcv))
break :result src_mcv;
const src_lock = if (src_mcv.getReg()) |reg| self.register_manager.lockReg(reg) else null;
defer if (src_lock) |lock| self.register_manager.unlockReg(lock);
const dst_mcv = try self.allocRegOrMem(inst, true);
try self.genCopy(
if (!dst_mcv.isMemory() or src_mcv.isMemory()) dst_ty else src_ty,
dst_mcv,
src_mcv,
);
const dst_mcv = if (dst_rc.supersetOf(src_rc) and
self.reuseOperand(inst, ty_op.operand, 0, src_mcv))
src_mcv
else dst: {
const dst_mcv = try self.allocRegOrMem(inst, true);
try self.genCopy(
if (!dst_mcv.isMemory() or src_mcv.isMemory()) dst_ty else src_ty,
dst_mcv,
src_mcv,
);
break :dst dst_mcv;
};
const dst_signedness =
if (dst_ty.isAbiInt()) dst_ty.intInfo(self.target.*).signedness else .unsigned;