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Added simd_extract_lsbs intrinsic as well.

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Equivalent to the simd_extract_msbs intrinsic, except it extracts the
least significant bit of each element instead.
This commit is contained in:
Barinzaya
2025-02-24 08:49:57 -05:00
parent 33a3aab791
commit 4afedbc051
5 changed files with 12 additions and 3 deletions
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src/llvm_backend_proc.cpp
+7 -3
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@@ -1564,6 +1564,7 @@ gb_internal lbValue lb_build_builtin_simd_proc(lbProcedure *p, Ast *expr, TypeAn
return res;
}
case BuiltinProc_simd_extract_lsbs:
case BuiltinProc_simd_extract_msbs:
{
Type *vt = arg0.type;
@@ -1572,9 +1573,12 @@ gb_internal lbValue lb_build_builtin_simd_proc(lbProcedure *p, Ast *expr, TypeAn
i64 elem_bits = 8*type_size_of(elem);
i64 num_elems = get_array_type_count(vt);
LLVMTypeRef word_type = lb_type(m, elem);
LLVMValueRef shift_value = llvm_splat_int(num_elems, word_type, elem_bits - 1);
LLVMValueRef broadcast_value = LLVMBuildAShr(p->builder, arg0.value, shift_value, "");
LLVMValueRef broadcast_value = arg0.value;
if (builtin_id == BuiltinProc_simd_extract_msbs) {
LLVMTypeRef word_type = lb_type(m, elem);
LLVMValueRef shift_value = llvm_splat_int(num_elems, word_type, elem_bits - 1);
broadcast_value = LLVMBuildAShr(p->builder, broadcast_value, shift_value, "");
}
LLVMTypeRef bitvec_type = LLVMVectorType(LLVMInt1TypeInContext(m->ctx), (unsigned)num_elems);
LLVMValueRef bitvec_value = LLVMBuildTrunc(p->builder, broadcast_value, bitvec_type, "");