The comparision "max(x,y)==x" is equivalent to "x>=y". Since the max is
often expressed as "x >= y ? x : y", there is a good chance we can extract
the existing "x >= y" from it and use that as a replacement for "max(x,y)==x".
llvm-svn: 131049
diff --git a/llvm/test/Transforms/InstSimplify/maxmin.ll b/llvm/test/Transforms/InstSimplify/maxmin.ll
index 707422c..e921214 100644
--- a/llvm/test/Transforms/InstSimplify/maxmin.ll
+++ b/llvm/test/Transforms/InstSimplify/maxmin.ll
@@ -231,3 +231,39 @@
ret i1 %c
; CHECK: ret i1 false
}
+
+define i1 @eqcmp1(i32 %x, i32 %y) {
+; CHECK: @eqcmp1
+ %c = icmp sge i32 %x, %y
+ %max = select i1 %c, i32 %x, i32 %y
+ %r = icmp eq i32 %max, %x
+ ret i1 %r
+; CHECK: ret i1 %c
+}
+
+define i1 @eqcmp2(i32 %x, i32 %y) {
+; CHECK: @eqcmp2
+ %c = icmp sge i32 %x, %y
+ %max = select i1 %c, i32 %x, i32 %y
+ %r = icmp eq i32 %x, %max
+ ret i1 %r
+; CHECK: ret i1 %c
+}
+
+define i1 @eqcmp3(i32 %x, i32 %y) {
+; CHECK: @eqcmp3
+ %c = icmp uge i32 %x, %y
+ %max = select i1 %c, i32 %x, i32 %y
+ %r = icmp eq i32 %max, %x
+ ret i1 %r
+; CHECK: ret i1 %c
+}
+
+define i1 @eqcmp4(i32 %x, i32 %y) {
+; CHECK: @eqcmp4
+ %c = icmp uge i32 %x, %y
+ %max = select i1 %c, i32 %x, i32 %y
+ %r = icmp eq i32 %x, %max
+ ret i1 %r
+; CHECK: ret i1 %c
+}