fabi/Xenia-Canary
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

[x64] Add BMI1-based acceleration for AndNot

Browse Source 
In the case of having two register operands for `AndNot`, the `andn` instruction can be used when the host supports `BMI1`. `andn` only supports 32-bit and 64-bit operands, so some register up-casting is needed.
This commit is contained in:
Wunkolo
2022-01-02 16:56:04 -08:00
committed by Rick Gibbed
parent 3ab43d480d
commit 24d4e1e0e5
1 changed files with 16 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
src/xenia/cpu/backend/x64/x64_sequences.cc
View File

@@ -2656,6 +2656,15 @@ void EmitAndNotXX(X64Emitter& e, const ARGS& i) {
} }
} else { } else {
// neither are constant // neither are constant
if (e.IsFeatureEnabled(kX64EmitBMI1)) {
if (i.dest.reg().getBit() == 64) {
e.andn(i.dest.reg().cvt64(), i.src2.reg().cvt64(),
i.src1.reg().cvt64());
} else {
e.andn(i.dest.reg().cvt32(), i.src2.reg().cvt32(),
i.src1.reg().cvt32());
}
} else {
if (i.dest == i.src2) { if (i.dest == i.src2) {
e.not_(i.dest); e.not_(i.dest);
e.and_(i.dest, i.src1); e.and_(i.dest, i.src1);
@@ -2666,6 +2675,7 @@ void EmitAndNotXX(X64Emitter& e, const ARGS& i) {
} }
} }
} }
}
struct AND_NOT_I8 : Sequence<AND_NOT_I8, I<OPCODE_AND_NOT, I8Op, I8Op, I8Op>> { struct AND_NOT_I8 : Sequence<AND_NOT_I8, I<OPCODE_AND_NOT, I8Op, I8Op, I8Op>> {
static void Emit(X64Emitter& e, const EmitArgType& i) { static void Emit(X64Emitter& e, const EmitArgType& i) {
EmitAndNotXX<AND_NOT_I8, Reg8>(e, i); EmitAndNotXX<AND_NOT_I8, Reg8>(e, i);