1 files changed, 25 insertions, 0 deletions
diff --git a/llvm/test/Analysis/ScalarEvolution/trunc-simplify.ll b/llvm/test/Analysis/ScalarEvolution/trunc-simplify.ll
new file mode 100644
index 00000000000..cf37371939d
--- /dev/null
+++ b/llvm/test/Analysis/ScalarEvolution/trunc-simplify.ll
@@ -0,0 +1,25 @@
+; RUN: opt < %s -analyze -scalar-evolution | FileCheck %s
+
+; Check that we convert
+;   trunc(C * a) -> trunc(C) * trunc(a)
+; if C is a constant.
+; CHECK-LABEL: @trunc_of_mul
+define i8 @trunc_of_mul(i32 %a) {
+  %b = mul i32 %a, 100
+  ; CHECK: %c
+  ; CHECK-NEXT: --> (100 * (trunc i32 %a to i8))
+  %c = trunc i32 %b to i8
+  ret i8 %c
+}
+
+; Check that we convert
+;   trunc(C + a) -> trunc(C) + trunc(a)
+; if C is a constant.
+; CHECK-LABEL: @trunc_of_add
+define i8 @trunc_of_add(i32 %a) {
+  %b = add i32 %a, 100
+  ; CHECK: %c
+  ; CHECK-NEXT: --> (100 + (trunc i32 %a to i8))
+  %c = trunc i32 %b to i8
+  ret i8 %c
+}