1 files changed, 62 insertions, 0 deletions
diff --git a/test/Analysis/ScalarEvolution/fold.ll b/test/Analysis/ScalarEvolution/fold.ll
new file mode 100644
index 0000000..4e2adf1
--- /dev/null
+++ b/test/Analysis/ScalarEvolution/fold.ll
@@ -0,0 +1,62 @@
+; RUN: opt -analyze -scalar-evolution %s -S | FileCheck %s
+
+define i16 @test1(i8 %x) {
+  %A = zext i8 %x to i12
+  %B = sext i12 %A to i16
+; CHECK: zext i8 %x to i16
+  ret i16 %B
+}
+
+define i8 @test2(i8 %x) {
+  %A = zext i8 %x to i16
+  %B = add i16 %A, 1025
+  %C = trunc i16 %B to i8
+; CHECK: (1 + %x)
+  ret i8 %C
+}
+
+define i8 @test3(i8 %x) {
+  %A = zext i8 %x to i16
+  %B = mul i16 %A, 1027
+  %C = trunc i16 %B to i8
+; CHECK: (3 * %x)
+  ret i8 %C
+}
+
+define void @test4(i32 %x, i32 %y) {
+entry:
+  %Y = and i32 %y, 3
+  br label %loop
+loop:
+  %A = phi i32 [0, %entry], [%I, %loop]
+  %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 ([[EXPR]]) to i30)
+  %D = sext i16 %B to i32
+; CHECK: %D =
+; CHECK-NEXT: ([[EXPR]])
+  %E = sext i16 %B to i34
+; CHECK: %E =
+; CHECK-NEXT: (zext i32 ([[EXPR]]) to i34)
+  %F = zext i16 %B to i30
+; CHECK: %F =
+; CHECK-NEXT: (trunc i32 ([[EXPR]]) to i30
+  %G = zext i16 %B to i32
+; CHECK: %G =
+; CHECK-NEXT: ([[EXPR]])
+  %H = zext i16 %B to i34
+; CHECK: %H =
+; CHECK-NEXT: (zext i32 ([[EXPR]]) to i34)
+  %I = add i32 %A, 1
+  %0 = icmp ne i32 %A, 20
+  br i1 %0, label %loop, label %exit
+exit:
+  ret void
+}