[X86] Add add/sub saturation undef tests.
llvm-svn: 351066
diff --git a/llvm/test/CodeGen/X86/combine-add-usat.ll b/llvm/test/CodeGen/X86/combine-add-usat.ll
index b69bdd5..260d6ba 100644
--- a/llvm/test/CodeGen/X86/combine-add-usat.ll
+++ b/llvm/test/CodeGen/X86/combine-add-usat.ll
@@ -11,6 +11,32 @@
declare i64 @llvm.uadd.sat.i64 (i64, i64)
declare <8 x i16> @llvm.uadd.sat.v8i16(<8 x i16>, <8 x i16>)
+; fold (uadd_sat x, undef) -> -1
+define i32 @combine_undef_i32(i32 %a0) {
+; CHECK-LABEL: combine_undef_i32:
+; CHECK: # %bb.0:
+; CHECK-NEXT: addl %eax, %edi
+; CHECK-NEXT: movl $-1, %eax
+; CHECK-NEXT: cmovael %edi, %eax
+; CHECK-NEXT: retq
+ %res = call i32 @llvm.uadd.sat.i32(i32 %a0, i32 undef)
+ ret i32 %res
+}
+
+define <8 x i16> @combine_undef_v8i16(<8 x i16> %a0) {
+; SSE-LABEL: combine_undef_v8i16:
+; SSE: # %bb.0:
+; SSE-NEXT: paddusw %xmm0, %xmm0
+; SSE-NEXT: retq
+;
+; AVX-LABEL: combine_undef_v8i16:
+; AVX: # %bb.0:
+; AVX-NEXT: vpaddusw %xmm0, %xmm0, %xmm0
+; AVX-NEXT: retq
+ %res = call <8 x i16> @llvm.uadd.sat.v8i16(<8 x i16> undef, <8 x i16> %a0)
+ ret <8 x i16> %res
+}
+
; fold (uadd_sat c1, c2) -> c3
define i32 @combine_constfold_i32() {
; CHECK-LABEL: combine_constfold_i32: