Merging r259798, r259835:

[oota-llvm.git] / test / Transforms / Reassociate / 2002-05-15-SubReassociate.ll

diff --git a/test/Transforms/Reassociate/2002-05-15-SubReassociate.ll b/test/Transforms/Reassociate/2002-05-15-SubReassociate.ll
index c18af5e07efdd8c119b043f2743564ebdcdc29ef..29c178ffec3ec9c9b85351eface88fdd865043bd 100644 (file)
--- a/test/Transforms/Reassociate/2002-05-15-SubReassociate.ll
+++ b/test/Transforms/Reassociate/2002-05-15-SubReassociate.ll
@@ -1,12 +1,30 @@
+; RUN: opt < %s -reassociate -constprop -instcombine -dce -S | FileCheck %s
+
 ; With sub reassociation, constant folding can eliminate all of the constants.
-;
-; RUN: opt < %s -reassociate -constprop -instcombine -dce -S | not grep add
+define i32 @test1(i32 %A, i32 %B) {
+; CHECK-LABEL: test1
+; CHECK-NEXT: %Z = sub i32 %A, %B
+; CHECK-NEXT: ret i32 %Z
 
-define i32 @test(i32 %A, i32 %B) {
-       %W = add i32 5, %B              ; <i32> [#uses=1]
-       %X = add i32 -7, %A             ; <i32> [#uses=1]
-       %Y = sub i32 %X, %W             ; <i32> [#uses=1]
-       %Z = add i32 %Y, 12             ; <i32> [#uses=1]
-       ret i32 %Z
+  %W = add i32 5, %B
+  %X = add i32 -7, %A
+  %Y = sub i32 %X, %W
+  %Z = add i32 %Y, 12
+  ret i32 %Z
 }
+ 
+; With sub reassociation, constant folding can eliminate the two 12 constants.
+define i32 @test2(i32 %A, i32 %B, i32 %C, i32 %D) {
+; CHECK-LABEL: test2
+; CHECK-NEXT: %sum = add i32 %B, %A
+; CHECK-NEXT: %sum1 = add i32 %sum, %C
+; CHECK-NEXT: %Q = sub i32 %D, %sum1
+; CHECK-NEXT: ret i32 %Q
 
+  %M = add i32 %A, 12
+  %N = add i32 %M, %B
+  %O = add i32 %N, %C
+  %P = sub i32 %D, %O
+  %Q = add i32 %P, 12
+  ret i32 %Q
+}