[llvm] r326661 - [InstCombine] add test for vectors with undef elts; NFC

[Sanjay Patel via llvm-commits]

Author: spatel
Date: Sat Mar  3 10:00:15 2018
New Revision: 326661

URL: http://llvm.org/viewvc/llvm-project?rev=326661&view=rev
Log:
[InstCombine] add test for vectors with undef elts; NFC

Modified:
    llvm/trunk/test/Transforms/InstCombine/sub.ll

Modified: llvm/trunk/test/Transforms/InstCombine/sub.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Transforms/InstCombine/sub.ll?rev=326661&r1=326660&r2=326661&view=diff
==============================================================================
--- llvm/trunk/test/Transforms/InstCombine/sub.ll (original)
+++ llvm/trunk/test/Transforms/InstCombine/sub.ll Sat Mar  3 10:00:15 2018
@@ -40,7 +40,6 @@ define i32 @test4(i32 %A, i32 %x) {
   ret i32 %C
 }
 
-; FIXME:
 ; (~X) - (~Y) --> Y - X
 ; Also, show that we can handle extra uses and vectors.
 
@@ -73,6 +72,20 @@ define <2 x i8> @notnotsub_vec(<2 x i8>
   %sub = sub <2 x i8> %nx, %ny
   ret <2 x i8> %sub
 }
+
+; FIXME:
+define <2 x i8> @notnotsub_vec_undef_elts(<2 x i8> %x, <2 x i8> %y) {
+; CHECK-LABEL: @notnotsub_vec_undef_elts(
+; CHECK-NEXT:    [[NX:%.*]] = xor <2 x i8> [[X:%.*]], <i8 undef, i8 -1>
+; CHECK-NEXT:    [[NY:%.*]] = xor <2 x i8> [[Y:%.*]], <i8 -1, i8 undef>
+; CHECK-NEXT:    [[SUB:%.*]] = sub <2 x i8> [[NX]], [[NY]]
+; CHECK-NEXT:    ret <2 x i8> [[SUB]]
+;
+  %nx = xor <2 x i8> %x, <i8 undef, i8 -1>
+  %ny = xor <2 x i8> %y, <i8 -1, i8 undef>
+  %sub = sub <2 x i8> %nx, %ny
+  ret <2 x i8> %sub
+}
 
 define i32 @test5(i32 %A, i32 %B, i32 %C) {
 ; CHECK-LABEL: @test5(