+; RUN: opt < %s -sccp -S | FileCheck %s
+
+; This is a basic sanity check for constant propagation. The add instruction
+; should be eliminated.
+
+define i32 @test1(i1 %B) {
+ br i1 %B, label %BB1, label %BB2
+BB1: ; preds = %0
+ %Val = add i32 0, 0 ; <i32> [#uses=1]
+ br label %BB3
+BB2: ; preds = %0
+ br label %BB3
+BB3: ; preds = %BB2, %BB1
+ %Ret = phi i32 [ %Val, %BB1 ], [ 1, %BB2 ] ; <i32> [#uses=1]
+ ret i32 %Ret
+
+; CHECK-LABEL: @test1(
+; CHECK: %Ret = phi i32 [ 0, %BB1 ], [ 1, %BB2 ]
+}
+
; This is the test case taken from appel's book that illustrates a hard case
-; that SCCP gets right. BB3 should be completely eliminated.
+; that SCCP gets right.
;
-; RUN: if as < %s | opt -sccp -constprop -dce -cfgsimplify | dis | grep BB3
-; RUN: then exit 1
-; RUN: else exit 0
-; RUN: fi
-
-int "test function"(int %i0, int %j0)
-begin
+define i32 @test2(i32 %i0, i32 %j0) {
+; CHECK-LABEL: @test2(
BB1:
br label %BB2
BB2:
- %j2 = phi int [%j4, %BB7], [1, %BB1]
- %k2 = phi int [%k4, %BB7], [0, %BB1]
- %kcond = setlt int %k2, 100
- br bool %kcond, label %BB3, label %BB4
-
+ %j2 = phi i32 [ %j4, %BB7 ], [ 1, %BB1 ]
+ %k2 = phi i32 [ %k4, %BB7 ], [ 0, %BB1 ]
+ %kcond = icmp slt i32 %k2, 100
+ br i1 %kcond, label %BB3, label %BB4
BB3:
- %jcond = setlt int %j2, 20
- br bool %jcond, label %BB5, label %BB6
-
+ %jcond = icmp slt i32 %j2, 20
+ br i1 %jcond, label %BB5, label %BB6
+; CHECK: BB3:
+; CHECK-NEXT: br i1 true, label %BB5, label %BB6
BB4:
- ret int %j2
-
+ ret i32 %j2
+; CHECK: BB4:
+; CHECK-NEXT: ret i32 1
BB5:
- %k3 = add int %k2, 1
+ %k3 = add i32 %k2, 1
br label %BB7
-
BB6:
- %k5 = add int %k2, 1
+ %k5 = add i32 %k2, 1
br label %BB7
-
+; CHECK: BB6:
+; CHECK-NEXT: br label %BB7
BB7:
- %j4 = phi int [1, %BB5], [%k2, %BB6]
- %k4 = phi int [%k3, %BB5], [%k5, %BB6]
+ %j4 = phi i32 [ 1, %BB5 ], [ %k2, %BB6 ]
+ %k4 = phi i32 [ %k3, %BB5 ], [ %k5, %BB6 ]
br label %BB2
-end
+; CHECK: BB7:
+; CHECK-NEXT: %k4 = phi i32 [ %k3, %BB5 ], [ undef, %BB6 ]
+; CHECK-NEXT: br label %BB2
+}