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Fix CNTLZ with 0.

This commit is contained in:
Ben Vanik 2014-02-01 00:05:53 -08:00
parent 50cb12634e
commit 6eef76374d
1 changed files with 4 additions and 4 deletions
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8
src/alloy/backend/x64/lowering/lowering_sequences.cc
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@ -2459,7 +2459,7 @@ table->AddSequence(OPCODE_CNTLZ, [](X64Emitter& e, Instr*& i) {
i->src1.value, src, 0);
e.bsr(dest.cvt16(), src.cvt16());
// ZF = 1 if zero
e.mov(e.eax, 16);
e.mov(e.eax, 16 ^ 0x7);
e.cmovz(dest.cvt32(), e.eax);
e.sub(dest, 8);
e.xor(dest, 0x7);
@ -2471,7 +2471,7 @@ table->AddSequence(OPCODE_CNTLZ, [](X64Emitter& e, Instr*& i) {
i->src1.value, src, 0);
e.bsr(dest.cvt16(), src);
// ZF = 1 if zero
e.mov(e.eax, 16);
e.mov(e.eax, 16 ^ 0xF);
e.cmovz(dest.cvt32(), e.eax);
e.xor(dest, 0xF);
e.EndOp(dest, src);
@ -2482,7 +2482,7 @@ table->AddSequence(OPCODE_CNTLZ, [](X64Emitter& e, Instr*& i) {
i->src1.value, src, 0);
e.bsr(dest.cvt32(), src);
// ZF = 1 if zero
e.mov(e.eax, 32);
e.mov(e.eax, 32 ^ 0x1F);
e.cmovz(dest.cvt32(), e.eax);
e.xor(dest, 0x1F);
e.EndOp(dest, src);
@ -2493,7 +2493,7 @@ table->AddSequence(OPCODE_CNTLZ, [](X64Emitter& e, Instr*& i) {
i->src1.value, src, 0);
e.bsr(dest, src);
// ZF = 1 if zero
e.mov(e.eax, 64);
e.mov(e.eax, 64 ^ 0x3F);
e.cmovz(dest.cvt32(), e.eax);
e.xor(dest, 0x3F);
e.EndOp(dest, src);