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emit_x64_data_processing: Detect overflow on division

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This commit is contained in:
Merry 2022-11-29 14:15:03 +00:00
parent 905d822810
commit 038b728797
3 changed files with 52 additions and 5 deletions
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17
src/dynarmic/backend/x64/emit_x64_data_processing.cpp
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@ -1189,16 +1189,17 @@ void EmitX64::EmitSignedDiv32(EmitContext& ctx, IR::Inst* inst) {
ctx.reg_alloc.ScratchGpr(HostLoc::RAX);
ctx.reg_alloc.ScratchGpr(HostLoc::RDX);
const Xbyak::Reg32 dividend = ctx.reg_alloc.UseGpr(args[0]).cvt32();
const Xbyak::Reg32 divisor = ctx.reg_alloc.UseGpr(args[1]).cvt32();
const Xbyak::Reg32 divisor = ctx.reg_alloc.UseScratchGpr(args[1]).cvt32();
Xbyak::Label end;
code.xor_(eax, eax);
code.test(divisor, divisor);
code.jz(end);
code.mov(eax, dividend);
code.cdq();
code.idiv(divisor);
code.movsxd(rax, dividend);
code.movsxd(divisor.cvt64(), divisor);
code.cqo();
code.idiv(divisor.cvt64());
code.L(end);
ctx.reg_alloc.DefineValue(inst, eax);
@ -1212,11 +1213,17 @@ void EmitX64::EmitSignedDiv64(EmitContext& ctx, IR::Inst* inst) {
const Xbyak::Reg64 dividend = ctx.reg_alloc.UseGpr(args[0]);
const Xbyak::Reg64 divisor = ctx.reg_alloc.UseGpr(args[1]);
Xbyak::Label end;
Xbyak::Label end, ok;
code.xor_(eax, eax);
code.test(divisor, divisor);
code.jz(end);
code.cmp(divisor, -1);
code.jne(ok);
code.mov(rax, 0x8000000000000000);
code.cmp(dividend, rax);
code.je(end);
code.L(ok);
code.mov(rax, dividend);
code.cqo();
code.idiv(divisor);