Merging r259798, r259835:

[oota-llvm.git] / test / Transforms / Reassociate / subtest.ll

diff --git a/test/Transforms/Reassociate/subtest.ll b/test/Transforms/Reassociate/subtest.ll
index 38a887b56625fc7db02e3465923dd651fbb44a18..e6263d85522c9051f9fdf0a9219e7c9cc0772008 100644 (file)
--- a/test/Transforms/Reassociate/subtest.ll
+++ b/test/Transforms/Reassociate/subtest.ll
@@ -1,10 +1,26 @@
+; RUN: opt < %s -reassociate -instcombine -S | FileCheck %s
+
 ; With sub reassociation, constant folding can eliminate the 12 and -12 constants.
-;
-; RUN: as < %s | opt -reassociate -constprop -instcombine -die | dis | not grep 12
+define i32 @test1(i32 %A, i32 %B) {
+; CHECK-LABEL: @test1
+; CHECK-NEXT: %Z = sub i32 %A, %B
+; CHECK-NEXT: ret i32 %Z
+  %X = add i32 -12, %A
+  %Y = sub i32 %X, %B
+  %Z = add i32 %Y, 12
+  ret i32 %Z
+}
+
+; PR2047
+; With sub reassociation, constant folding can eliminate the uses of %a.
+define i32 @test2(i32 %a, i32 %b, i32 %c) nounwind  {
+; CHECK-LABEL: @test2
+; CHECK-NEXT: %sum = add i32 %c, %b
+; CHECK-NEXT: %tmp7 = sub i32 0, %sum
+; CHECK-NEXT: ret i32 %tmp7
 
-int "test"(int %A, int %B) {
-       %X = add int -12, %A
-       %Y = sub int %X, %B
-       %Z = add int %Y, 12
-       ret int %Z
+  %tmp3 = sub i32 %a, %b
+  %tmp5 = sub i32 %tmp3, %c
+  %tmp7 = sub i32 %tmp5, %a
+  ret i32 %tmp7
 }