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Possibly correct FLOAT16 unpack.

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This commit is contained in:
Ben Vanik
2014-06-10 21:35:50 -07:00
parent 574a04a853
commit 713cfcb429
3 changed files with 7 additions and 16 deletions
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21
src/alloy/backend/x64/x64_sequences.cc
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@@ -29,9 +29,6 @@
#include <alloy/hir/hir_builder.h>
#include <alloy/runtime/runtime.h>
// TODO(benvanik): reimplement packing functions
#include <DirectXPackedVector.h>
using namespace alloy;
using namespace alloy::backend;
using namespace alloy::backend::x64;
@@ -4820,13 +4817,6 @@ EMITTER(UNPACK, MATCH(I<OPCODE_UNPACK, V128<>, V128<>>)) {
// mult by 1/255
e.vmulps(i.dest, e.GetXmmConstPtr(XMMOneOver255));
}
static void Unpack_FLOAT16_2(void* raw_context, __m128& v) {
uint32_t src = v.m128_i32[3];
v.m128_f32[0] = DirectX::PackedVector::XMConvertHalfToFloat((uint16_t)src);
v.m128_f32[1] = DirectX::PackedVector::XMConvertHalfToFloat((uint16_t)(src >> 16));
v.m128_f32[2] = 0.0f;
v.m128_f32[3] = 1.0f;
}
static void EmitFLOAT16_2(X64Emitter& e, const EmitArgType& i) {
// 1 bit sign, 5 bit exponent, 10 bit mantissa
// D3D10 half float format
@@ -4844,14 +4834,13 @@ EMITTER(UNPACK, MATCH(I<OPCODE_UNPACK, V128<>, V128<>>)) {
// XMConvertHalfToFloat(sy),
// 0.0,
// 1.0 };
auto addr = e.StashXmm(i.src1);
e.lea(e.rdx, addr);
e.CallNative(Unpack_FLOAT16_2);
e.vmovaps(i.dest, addr);
e.vcvtph2ps(i.dest, i.src1);
e.vpshufd(i.dest, i.dest, B10100100);
e.vpor(i.dest, e.GetXmmConstPtr(XMM0001));
}
static void EmitFLOAT16_4(X64Emitter& e, const EmitArgType& i) {
// Could be shared with FLOAT16_2.
XEASSERTALWAYS();
// src = [(dest.x | dest.y), (dest.z | dest.w), 0, 0]
e.vcvtph2ps(i.dest, i.src1);
}
static void EmitSHORT_2(X64Emitter& e, const EmitArgType& i) {
// (VD.x) = 3.0 + (VB.x>>16)*2^-22