1 files changed, 41 insertions, 0 deletions
diff --git a/test/Transforms/InstCombine/cast-mul-select.ll b/test/Transforms/InstCombine/cast-mul-select.ll
new file mode 100644
index 0000000..f55423c
--- /dev/null
+++ b/test/Transforms/InstCombine/cast-mul-select.ll
@@ -0,0 +1,41 @@
+; RUN: opt < %s -instcombine -S | FileCheck %s
+
+target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32"
+
+define i32 @mul(i32 %x, i32 %y) {
+  %A = trunc i32 %x to i8
+  %B = trunc i32 %y to i8
+  %C = mul i8 %A, %B
+  %D = zext i8 %C to i32
+  ret i32 %D
+; CHECK: %C = mul i32 %x, %y
+; CHECK: %D = and i32 %C, 255
+; CHECK: ret i32 %D
+}
+
+define i32 @select1(i1 %cond, i32 %x, i32 %y, i32 %z) {
+  %A = trunc i32 %x to i8
+  %B = trunc i32 %y to i8
+  %C = trunc i32 %z to i8
+  %D = add i8 %A, %B
+  %E = select i1 %cond, i8 %C, i8 %D
+  %F = zext i8 %E to i32
+  ret i32 %F
+; CHECK: %D = add i32 %x, %y
+; CHECK: %E = select i1 %cond, i32 %z, i32 %D
+; CHECK: %F = and i32 %E, 255
+; CHECK: ret i32 %F
+}
+
+define i8 @select2(i1 %cond, i8 %x, i8 %y, i8 %z) {
+  %A = zext i8 %x to i32
+  %B = zext i8 %y to i32
+  %C = zext i8 %z to i32
+  %D = add i32 %A, %B
+  %E = select i1 %cond, i32 %C, i32 %D
+  %F = trunc i32 %E to i8
+  ret i8 %F
+; CHECK: %D = add i8 %x, %y
+; CHECK: %E = select i1 %cond, i8 %z, i8 %D
+; CHECK: ret i8 %E
+}