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Use vpminud to saturate rather than bitwise ops (shaves 6 instructions per 16 in 32 saturated pack)

This commit is contained in:
Dr. Chat 2016-07-23 19:19:40 -05:00
parent 2d55b12cc9
commit 8427acfada
1 changed files with 26 additions and 16 deletions
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30
src/xenia/cpu/backend/x64/x64_sequences.cc
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@ -588,6 +588,7 @@ struct Sequence {
e.LoadConstantXmm(e.xmm0, i.src1.constant());
fn(e, i.dest, e.xmm0, i.src2);
} else if (i.src2.is_constant) {
assert_true(!i.src1.is_constant);
e.LoadConstantXmm(e.xmm0, i.src2.constant());
fn(e, i.dest, i.src1, e.xmm0);
} else {
@ -7070,6 +7071,7 @@ struct PACK : Sequence<PACK, I<OPCODE_PACK, V128Op, V128Op, V128Op>> {
}
}
}
// Pack 2 32-bit vectors into a 16-bit vector.
static void Emit16_IN_32(X64Emitter& e, const EmitArgType& i,
uint32_t flags) {
// TODO(benvanik): handle src2 (or src1) being constant zero
@ -7077,26 +7079,34 @@ struct PACK : Sequence<PACK, I<OPCODE_PACK, V128Op, V128Op, V128Op>> {
if (IsPackOutUnsigned(flags)) {
if (IsPackOutSaturate(flags)) {
// unsigned -> unsigned + saturate
// Construct a saturation mask
e.mov(e.eax, ~0xFFFFu);
// Construct a saturation max value
e.mov(e.eax, 0xFFFFu);
e.vmovd(e.xmm0, e.eax);
e.vpshufd(e.xmm0, e.xmm0, 0b00000000);
e.vandps(e.xmm1, e.xmm0, i.src1); // src1 & 0xFFFF0000
e.vpcmpeqd(e.xmm1, e.xmm1, e.GetXmmConstPtr(XMMZero));
e.vpxor(e.xmm1, e.xmm1, e.GetXmmConstPtr(XMMFFFF));
e.vpor(e.xmm1, e.xmm1, i.src1); // Saturate src1
if (!i.src1.is_constant) {
e.vpminud(e.xmm1, i.src1, e.xmm0); // Saturate src1
e.vpshuflw(e.xmm1, e.xmm1, 0b00100010);
e.vpshufhw(e.xmm1, e.xmm1, 0b00100010);
e.vpshufd(e.xmm1, e.xmm1, 0b00001000);
} else {
// TODO(DrChat): Non-zero constants
assert_true(i.src1.constant().u64[0] == 0 &&
i.src1.constant().u64[1] == 0);
e.vpxor(e.xmm1, e.xmm1);
}
e.vandps(e.xmm0, e.xmm0, i.src2); // src2 & 0xFFFF0000
e.vpcmpeqd(e.xmm0, e.xmm0, e.GetXmmConstPtr(XMMZero));
e.vpxor(e.xmm0, e.xmm0, e.GetXmmConstPtr(XMMFFFF));
e.vpor(i.dest, e.xmm0, i.src2); // Saturate src2
if (!i.src2.is_constant) {
e.vpminud(i.dest, i.src2, e.xmm0); // Saturate src2
e.vpshuflw(i.dest, i.dest, 0b00100010);
e.vpshufhw(i.dest, i.dest, 0b00100010);
e.vpshufd(i.dest, i.dest, 0b10000000);
} else {
// TODO(DrChat): Non-zero constants
assert_true(i.src2.constant().u64[0] == 0 &&
i.src2.constant().u64[1] == 0);
e.vpxor(i.dest, i.dest);
}
e.vpblendw(i.dest, i.dest, e.xmm1, 0b00001111);
} else {