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Optimize EXTRACT_I32(0).

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This commit is contained in:
Ben Vanik
2014-06-10 21:38:17 -07:00
parent 4089f405af
commit 02709e0d65
1 changed files with 7 additions and 3 deletions
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10
src/alloy/backend/x64/x64_sequences.cc
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@@ -47,8 +47,8 @@ static std::unordered_multimap<uint32_t, SequenceSelectFn> sequence_table;
// Selects the right byte/word/etc from a vector. We need to flip logical // Selects the right byte/word/etc from a vector. We need to flip logical
// indices (0,1,2,3,4,5,6,7,...) = (3,2,1,0,7,6,5,4,...) // indices (0,1,2,3,4,5,6,7,...) = (3,2,1,0,7,6,5,4,...)
#define VEC128_B(n) ((n) & 0xC) | ((~(n)) & 0x3) #define VEC128_B(n) ((n) ^ 0x3)
#define VEC128_W(n) ((n) & 0x6) | ((~(n)) & 0x1) #define VEC128_W(n) ((n) ^ 0x1)
#define VEC128_D(n) (n) #define VEC128_D(n) (n)
#define VEC128_F(n) (n) #define VEC128_F(n) (n)
@@ -4413,7 +4413,11 @@ EMITTER(EXTRACT_I32, MATCH(I<OPCODE_EXTRACT, I32<>, V128<>, I8<>>)) {
vec128b(15, 14, 13, 12, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0), vec128b(15, 14, 13, 12, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0),
}; };
if (i.src2.is_constant) { if (i.src2.is_constant) {
e.vpextrd(i.dest, i.src1, VEC128_D(i.src2.constant())); if (i.src2.constant() == 0) {
e.vmovd(i.dest, i.src1);
} else {
e.vpextrd(i.dest, i.src1, VEC128_D(i.src2.constant()));
}
} else { } else {
// TODO(benvanik): try out hlide's version: // TODO(benvanik): try out hlide's version:
// e.mov(e.eax, 3); // e.mov(e.eax, 3);