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Better sign extend, thanks to @inolen.

This commit is contained in:
Ben Vanik 2015-07-27 20:25:20 -07:00
parent 226b7ae83f
commit ad9472e60b
1 changed files with 6 additions and 18 deletions
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24
src/xenia/cpu/backend/x64/x64_sequences.cc
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@ -4151,9 +4151,7 @@ struct DIV_I16 : Sequence<DIV_I16, I<OPCODE_DIV, I16Op, I16Op, I16Op>> {
e.div(e.cx);
} else {
e.mov(e.ax, i.src1);
// Set dx to sign bit of src1 (dx:ax = dx:ax / src).
e.mov(e.dx, e.ax);
e.sar(e.dx, 15);
e.cwd(); // dx:ax = sign-extend ax
e.idiv(e.cx);
}
} else {
@ -4176,9 +4174,7 @@ struct DIV_I16 : Sequence<DIV_I16, I<OPCODE_DIV, I16Op, I16Op, I16Op>> {
} else {
e.mov(e.ax, i.src1);
}
// Set dx to sign bit of src1 (dx:ax = dx:ax / src).
e.mov(e.dx, e.ax);
e.sar(e.dx, 15);
e.cwd(); // dx:ax = sign-extend ax
e.idiv(i.src2);
}
}
@ -4210,9 +4206,7 @@ struct DIV_I32 : Sequence<DIV_I32, I<OPCODE_DIV, I32Op, I32Op, I32Op>> {
e.div(e.ecx);
} else {
e.mov(e.eax, i.src1);
// Set dx to sign bit of src1 (dx:ax = dx:ax / src).
e.mov(e.edx, e.eax);
e.sar(e.edx, 31);
e.cdq(); // edx:eax = sign-extend eax
e.idiv(e.ecx);
}
} else {
@ -4235,9 +4229,7 @@ struct DIV_I32 : Sequence<DIV_I32, I<OPCODE_DIV, I32Op, I32Op, I32Op>> {
} else {
e.mov(e.eax, i.src1);
}
// Set dx to sign bit of src1 (dx:ax = dx:ax / src).
e.mov(e.edx, e.eax);
e.sar(e.edx, 31);
e.cdq(); // edx:eax = sign-extend eax
e.idiv(i.src2);
}
}
@ -4269,9 +4261,7 @@ struct DIV_I64 : Sequence<DIV_I64, I<OPCODE_DIV, I64Op, I64Op, I64Op>> {
e.div(e.rcx);
} else {
e.mov(e.rax, i.src1);
// Set dx to sign bit of src1 (dx:ax = dx:ax / src).
e.mov(e.rdx, e.rax);
e.sar(e.rdx, 63);
e.cqo(); // rdx:rax = sign-extend rax
e.idiv(e.rcx);
}
} else {
@ -4294,9 +4284,7 @@ struct DIV_I64 : Sequence<DIV_I64, I<OPCODE_DIV, I64Op, I64Op, I64Op>> {
} else {
e.mov(e.rax, i.src1);
}
// Set dx to sign bit of src1 (dx:ax = dx:ax / src).
e.mov(e.rdx, e.rax);
e.sar(e.rdx, 63);
e.cqo(); // rdx:rax = sign-extend rax
e.idiv(i.src2);
}
}