+; RUN: opt < %s -reassociate -constprop -instcombine -dce -S | FileCheck %s
+
; With sub reassociation, constant folding can eliminate all of the constants.
-;
-; RUN: as < %s | opt -reassociate -constprop -instcombine -dce | dis | 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
+
+ %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
-int %test(int %A, int %B) {
- %W = add int 5, %B
- %X = add int -7, %A
- %Y = sub int %X, %W
- %Z = add int %Y, 12
- ret int %Z
+ %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
}