Simplify some code with no functionality change. Make the test a lot more

robust against smarter optimizations, using the power of FileCheck.

llvm-svn: 124081

1 files changed, 19 insertions, 15 deletions

diff --git a/llvm/test/Analysis/ScalarEvolution/fold.ll b/llvm/test/Analysis/ScalarEvolution/fold.ll
index 90012a38ac5..4e2adf187e8 100644
--- a/llvm/test/Analysis/ScalarEvolution/fold.ll
+++ b/llvm/test/Analysis/ScalarEvolution/fold.ll
@@ -23,36 +23,40 @@ define i8 @test3(i8 %x) {
   ret i8 %C
 }
 
-define void @test4(i32 %x) {
+define void @test4(i32 %x, i32 %y) {
 entry:
-  %0 = icmp sge i32 %x, 0
-  br i1 %0, label %loop, label %exit
+  %Y = and i32 %y, 3
+  br label %loop
 loop:
   %A = phi i32 [0, %entry], [%I, %loop]
-  %rand = icmp sgt i32 %A, 10
-  %Z = select i1 %rand, i32 %A, i32 10
-  %B = trunc i32 %Z to i16
+  %rand1 = icmp sgt i32 %A, %Y
+  %Z1 = select i1 %rand1, i32 %A, i32 %Y
+  %rand2 = icmp ugt i32 %A, %Z1
+  %Z2 = select i1 %rand2, i32 %A, i32 %Z1
+; CHECK: %Z2 =
+; CHECK-NEXT: -->  ([[EXPR:.*]]){{ +}}Exits: 20
+  %B = trunc i32 %Z2 to i16
   %C = sext i16 %B to i30
 ; CHECK: %C =
-; CHECK-NEXT: (trunc i32 (10 smax {0,+,1}<%loop>) to i30)
+; CHECK-NEXT: (trunc i32 ([[EXPR]]) to i30)
   %D = sext i16 %B to i32
 ; CHECK: %D =
-; CHECK-NEXT: (10 smax {0,+,1}<%loop>)
+; CHECK-NEXT: ([[EXPR]])
   %E = sext i16 %B to i34
 ; CHECK: %E =
-; CHECK-NEXT: (zext i32 (10 smax {0,+,1}<%loop>) to i34)
+; CHECK-NEXT: (zext i32 ([[EXPR]]) to i34)
   %F = zext i16 %B to i30
 ; CHECK: %F =
-; CHECK-NEXT: (trunc i32 (10 smax {0,+,1}<%loop>) to i30
+; CHECK-NEXT: (trunc i32 ([[EXPR]]) to i30
   %G = zext i16 %B to i32
 ; CHECK: %G =
-; CHECK-NEXT: (10 smax {0,+,1}<%loop>)
+; CHECK-NEXT: ([[EXPR]])
   %H = zext i16 %B to i34
 ; CHECK: %H =
-; CHECK-NEXT: (zext i32 (10 smax {0,+,1}<%loop>) to i34)
+; CHECK-NEXT: (zext i32 ([[EXPR]]) to i34)
   %I = add i32 %A, 1
-  %1 = icmp ne i32 %A, 20
-  br i1 %1, label %loop, label %exit
+  %0 = icmp ne i32 %A, 20
+  br i1 %0, label %loop, label %exit
 exit:
   ret void
-}
\ No newline at end of file
+}