Imported Upstream version 5.18.0.246

Former-commit-id: 0c7ce5b1a7851e13f22acfd379b7f9fb304e4833

external/llvm/test/Transforms/InstCombine/setcc-strength-reduce.ll

@@ -0,0 +1,37 @@
+; This test ensures that "strength reduction" of conditional expressions are
+; working.  Basically this boils down to converting setlt,gt,le,ge instructions
+; into equivalent setne,eq instructions.
+;
+; RUN: opt < %s -instcombine -S | \
+; RUN:    grep -v "icmp eq" | grep -v "icmp ne" | not grep icmp
+; END.
+
+define i1 @test1(i32 %A) {
+        ; setne %A, 0
+        %B = icmp uge i32 %A, 1         ; <i1> [#uses=1]
+        ret i1 %B
+}
+
+define i1 @test2(i32 %A) {
+       ; setne %A, 0
+        %B = icmp ugt i32 %A, 0         ; <i1> [#uses=1]
+        ret i1 %B
+}
+
+define i1 @test3(i8 %A) {
+        ; setne %A, -128
+        %B = icmp sge i8 %A, -127               ; <i1> [#uses=1]
+        ret i1 %B
+}
+
+define i1 @test4(i8 %A) {
+        ; setne %A, 127 
+        %B = icmp sle i8 %A, 126                ; <i1> [#uses=1]
+        ret i1 %B
+}
+
+define i1 @test5(i8 %A) {
+        ; setne %A, 127
+        %B = icmp slt i8 %A, 127                ; <i1> [#uses=1]
+        ret i1 %B
+}