Move some rem transforms out of instcombine and into instsimplify.
This automagically provides a transform noticed by my super-optimizer
as occurring quite often: "rem x, (select cond, x, 1)" -> 0.
llvm-svn: 130694
diff --git a/llvm/test/Transforms/InstSimplify/rem.ll b/llvm/test/Transforms/InstSimplify/rem.ll
new file mode 100644
index 0000000..4c8f87c
--- /dev/null
+++ b/llvm/test/Transforms/InstSimplify/rem.ll
@@ -0,0 +1,17 @@
+; RUN: opt < %s -instsimplify -S | FileCheck %s
+
+define i32 @select1(i32 %x, i1 %b) {
+; CHECK: @select1
+ %rhs = select i1 %b, i32 %x, i32 1
+ %rem = srem i32 %x, %rhs
+ ret i32 %rem
+; CHECK: ret i32 0
+}
+
+define i32 @select2(i32 %x, i1 %b) {
+; CHECK: @select2
+ %rhs = select i1 %b, i32 %x, i32 1
+ %rem = urem i32 %x, %rhs
+ ret i32 %rem
+; CHECK: ret i32 0
+}