Added simd_extract_lsbs intrinsic as well.

Equivalent to the simd_extract_msbs intrinsic, except it extracts the
least significant bit of each element instead.

1 files changed, 7 insertions, 3 deletions

diff --git a/src/llvm_backend_proc.cpp b/src/llvm_backend_proc.cpp
index eea0fe03e..b41f4723c 100644
--- a/src/llvm_backend_proc.cpp
+++ b/src/llvm_backend_proc.cpp
@@ -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, "");