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Hacking in PACK 8_IN_16 UUS

This commit is contained in:
Ben Vanik 2015-02-17 17:23:19 -08:00
parent 29bc8d8620
commit c4aeedd0a3
1 changed files with 23 additions and 1 deletions
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24
src/alloy/backend/x64/x64_sequences.cc
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@ -5345,13 +5345,35 @@ EMITTER(PACK, MATCH(I<OPCODE_PACK, V128<>, V128<>, V128<>>)) {
// Pack.
e.vpshufb(i.dest, i.dest, e.GetXmmConstPtr(XMMPackSHORT_2));
}
static __m128i EmulatePack8_IN_16_UN_UN_SAT(void*, __m128i src1,
__m128i src2) {
alignas(16) uint16_t a[8];
alignas(16) uint16_t b[8];
alignas(16) uint8_t c[16];
_mm_store_si128(reinterpret_cast<__m128i*>(a), src1);
_mm_store_si128(reinterpret_cast<__m128i*>(b), src2);
for (int i = 0; i < 8; ++i) {
c[i] = uint8_t(std::max(uint16_t(0), std::min(uint16_t(255), a[i])));
c[i + 8] = uint8_t(std::max(uint16_t(0), std::min(uint16_t(255), b[i])));
}
return _mm_load_si128(reinterpret_cast<__m128i*>(c));
}
static void Emit8_IN_16(X64Emitter& e, const EmitArgType& i, uint32_t flags) {
// TODO(benvanik): handle src2 (or src1) being constant zero
if (IsPackInUnsigned(flags)) {
if (IsPackOutUnsigned(flags)) {
if (IsPackOutSaturate(flags)) {
// unsigned -> unsigned + saturate
assert_always();
if (i.src2.is_constant) {
e.LoadConstantXmm(e.xmm0, i.src2.constant());
e.lea(e.r9, e.StashXmm(1, e.xmm0));
} else {
e.lea(e.r9, e.StashXmm(1, i.src2));
}
e.lea(e.r8, e.StashXmm(0, i.src1));
e.CallNativeSafe(
reinterpret_cast<void*>(EmulatePack8_IN_16_UN_UN_SAT));
e.vmovaps(i.dest, e.xmm0);
} else {
// unsigned -> unsigned
assert_always();