1 files changed, 123 insertions, 0 deletions
diff --git a/test/Transforms/InstCombine/icmp.ll b/test/Transforms/InstCombine/icmp.ll
new file mode 100644
index 0000000..c2234a1
--- /dev/null
+++ b/test/Transforms/InstCombine/icmp.ll
@@ -0,0 +1,123 @@
+; RUN: opt < %s -instcombine -S | FileCheck %s
+
+define i32 @test1(i32 %X) {
+entry:
+        icmp slt i32 %X, 0              ; <i1>:0 [#uses=1]
+        zext i1 %0 to i32               ; <i32>:1 [#uses=1]
+        ret i32 %1
+; CHECK: @test1
+; CHECK: lshr i32 %X, 31
+; CHECK-NEXT: ret i32
+}
+
+define i32 @test2(i32 %X) {
+entry:
+        icmp ult i32 %X, -2147483648            ; <i1>:0 [#uses=1]
+        zext i1 %0 to i32               ; <i32>:1 [#uses=1]
+        ret i32 %1
+; CHECK: @test2
+; CHECK: lshr i32 %X, 31
+; CHECK-NEXT: xor i32
+; CHECK-NEXT: ret i32
+}
+
+define i32 @test3(i32 %X) {
+entry:
+        icmp slt i32 %X, 0              ; <i1>:0 [#uses=1]
+        sext i1 %0 to i32               ; <i32>:1 [#uses=1]
+        ret i32 %1
+; CHECK: @test3
+; CHECK: ashr i32 %X, 31
+; CHECK-NEXT: ret i32
+}
+
+define i32 @test4(i32 %X) {
+entry:
+        icmp ult i32 %X, -2147483648            ; <i1>:0 [#uses=1]
+        sext i1 %0 to i32               ; <i32>:1 [#uses=1]
+        ret i32 %1
+; CHECK: @test4
+; CHECK: ashr i32 %X, 31
+; CHECK-NEXT: xor i32
+; CHECK-NEXT: ret i32
+}
+
+; PR4837
+define <2 x i1> @test5(<2 x i64> %x) {
+entry:
+  %V = icmp eq <2 x i64> %x, undef
+  ret <2 x i1> %V
+; CHECK: @test5
+; CHECK: ret <2 x i1> undef
+}
+
+define i32 @test6(i32 %a, i32 %b) {
+        %c = icmp sle i32 %a, -1
+        %d = zext i1 %c to i32
+        %e = sub i32 0, %d
+        %f = and i32 %e, %b
+        ret i32 %f
+; CHECK: @test6
+; CHECK-NEXT: ashr i32 %a, 31
+; CHECK-NEXT: %f = and i32 %e, %b
+; CHECK-NEXT: ret i32 %f
+}
+
+
+define i1 @test7(i32 %x) {
+entry:
+  %a = add i32 %x, -1
+  %b = icmp ult i32 %a, %x
+  ret i1 %b
+; CHECK: @test7
+; CHECK: %b = icmp ne i32 %x, 0
+; CHECK: ret i1 %b
+}
+
+define i1 @test8(i32 %x){
+entry:
+  %a = add i32 %x, -1 
+  %b = icmp eq i32 %a, %x
+  ret i1 %b
+; CHECK: @test8
+; CHECK: ret i1 false
+}
+
+define i1 @test9(i32 %x)  {
+entry:
+  %a = add i32 %x, -2
+  %b = icmp ugt i32 %x, %a 
+  ret i1 %b
+; CHECK: @test9
+; CHECK: icmp ugt i32 %x, 1
+; CHECK: ret i1 %b
+}
+
+define i1 @test10(i32 %x){
+entry:
+  %a = add i32 %x, -1      
+  %b = icmp slt i32 %a, %x 
+  ret i1 %b
+  
+; CHECK: @test10
+; CHECK: %b = icmp ne i32 %x, -2147483648
+; CHECK: ret i1 %b
+}
+
+define i1 @test11(i32 %x) {
+  %a = add nsw i32 %x, 8
+  %b = icmp slt i32 %x, %a
+  ret i1 %b
+; CHECK: @test11  
+; CHECK: ret i1 true
+}
+
+; PR6195
+define i1 @test12(i1 %A) {
+  %S = select i1 %A, i64 -4294967295, i64 8589934591
+  %B = icmp ne i64 bitcast (<2 x i32> <i32 1, i32 -1> to i64), %S
+  ret i1 %B
+; CHECK: @test12
+; CHECK-NEXT: %B = select i1
+; CHECK-NEXT: ret i1 %B
+}