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[a64] Fix OPCODE_CNTLZ

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8 and 16 bit CNTLZ needs its bit-count fixed to its original element-type
This commit is contained in:
Wunkolo
2024-06-23 14:00:25 -07:00
parent 264f37fea4
commit 91fdab4f89
1 changed files with 4 additions and 2 deletions
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a64_sequences.cc
+4 -2
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@@ -2740,16 +2740,18 @@ EMITTER_OPCODE_TABLE(OPCODE_BYTE_SWAP, BYTE_SWAP_I16, BYTE_SWAP_I32,
// ============================================================================
struct CNTLZ_I8 : Sequence<CNTLZ_I8, I<OPCODE_CNTLZ, I8Op, I8Op>> {
static void Emit(A64Emitter& e, const EmitArgType& i) {
// No 8bit lzcnt, so do 16 and sub 8.
// No 8bit lzcnt, so do 32 and sub 24.
e.UXTB(i.dest, i.src1);
e.CLZ(i.dest, i.dest);
e.SUB(i.dest.reg(), i.dest.reg(), 8);
e.SUB(i.dest.reg(), i.dest.reg(), 24);
}
};
struct CNTLZ_I16 : Sequence<CNTLZ_I16, I<OPCODE_CNTLZ, I8Op, I16Op>> {
static void Emit(A64Emitter& e, const EmitArgType& i) {
// No 16bit lzcnt, so do 32 and sub 16.
e.UXTH(i.dest, i.src1);
e.CLZ(i.dest, i.dest);
e.SUB(i.dest.reg(), i.dest.reg(), 16);
}
};
struct CNTLZ_I32 : Sequence<CNTLZ_I32, I<OPCODE_CNTLZ, I8Op, I32Op>> {