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Merge pull request #207 from DrChat/mul_8_fix 

Fix 8bit multiply instructions
This commit is contained in:
Rick Gibbed 2015-05-15 10:22:30 -05:00
parent 65ba9c84a1 dbdf3271fb
commit 7546cca936
1 changed files with 8 additions and 8 deletions
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16
src/xenia/cpu/backend/x64/x64_sequences.cc
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@ -3076,22 +3076,22 @@ EMITTER(MUL_I8, MATCH(I<OPCODE_MUL, I8<>, I8<>, I8<>>)) {
} }
} else { } else {
// x86 mul instruction // x86 mul instruction
// AX = AL * $1; // AH:AL = AL * $1;
if (i.src1.is_constant) { if (i.src1.is_constant) {
assert_true(!i.src2.is_constant); assert_true(!i.src2.is_constant);
e.mov(e.al, i.src1.constant()); e.mov(e.al, i.src1.constant());
e.mul(i.src2); e.mul(i.src2);
e.mov(i.dest, e.ax); e.mov(i.dest, e.al);
} else if (i.src2.is_constant) { } else if (i.src2.is_constant) {
assert_true(!i.src1.is_constant); assert_true(!i.src1.is_constant);
e.mov(e.al, i.src2.constant()); e.mov(e.al, i.src2.constant());
e.mul(i.src1); e.mul(i.src1);
e.mov(i.dest, e.ax); e.mov(i.dest, e.al);
} else { } else {
e.movzx(e.al, i.src1); e.movzx(e.al, i.src1);
e.mul(i.src2); e.mul(i.src2);
e.mov(i.dest, e.ax); e.mov(i.dest, e.al);
} }
} }
@ -3281,21 +3281,21 @@ EMITTER(MUL_HI_I8, MATCH(I<OPCODE_MUL_HI, I8<>, I8<>, I8<>>)) {
e.mulx(i.dest.reg().cvt32(), e.eax, i.src2.reg().cvt32()); e.mulx(i.dest.reg().cvt32(), e.eax, i.src2.reg().cvt32());
} else { } else {
// x86 mul instruction // x86 mul instruction
// AX = AL * $1; // AH:AL = AL * $1;
if (i.src1.is_constant) { if (i.src1.is_constant) {
assert_true(!i.src2.is_constant); // can't multiply 2 constants assert_true(!i.src2.is_constant); // can't multiply 2 constants
e.mov(e.al, i.src1.constant()); e.mov(e.al, i.src1.constant());
e.mul(i.src2); e.mul(i.src2);
e.mov(i.dest, e.ax); e.mov(i.dest, e.ah);
} else if (i.src2.is_constant) { } else if (i.src2.is_constant) {
assert_true(!i.src1.is_constant); // can't multiply 2 constants assert_true(!i.src1.is_constant); // can't multiply 2 constants
e.mov(e.al, i.src2.constant()); e.mov(e.al, i.src2.constant());
e.mul(i.src1); e.mul(i.src1);
e.mov(i.dest, e.ax); e.mov(i.dest, e.ah);
} else { } else {
e.mov(e.al, i.src1); e.mov(e.al, i.src1);
e.mul(i.src2); e.mul(i.src2);
e.mov(i.dest, e.ax); e.mov(i.dest, e.ah);
} }
} }
} else { } else {