; RUN: opt < %s -correlated-propagation -S | FileCheck %s
; PR2581
-; CHECK: @test1
+; CHECK-LABEL: @test1(
define i32 @test1(i1 %C) nounwind {
br i1 %C, label %exit, label %body
; PR4420
declare i1 @ext()
-; CHECK: @test2
+; CHECK-LABEL: @test2(
define i1 @test2() {
entry:
%cond = tail call i1 @ext() ; <i1> [#uses=2]
; CHECK: ret i1 %res
ret i1 %res
}
+
+; PR4855
+@gv = internal constant i8 7
+; CHECK-LABEL: @test3(
+define i8 @test3(i8* %a) nounwind {
+entry:
+ %cond = icmp eq i8* %a, @gv
+ br i1 %cond, label %bb2, label %bb
+
+bb: ; preds = %entry
+ ret i8 0
+
+bb2: ; preds = %entry
+; CHECK: %should_be_const = load i8* @gv
+ %should_be_const = load i8* %a
+ ret i8 %should_be_const
+}
+
+; PR1757
+; CHECK-LABEL: @test4(
+define i32 @test4(i32) {
+EntryBlock:
+; CHECK: icmp sgt i32 %0, 2
+ %.demorgan = icmp sgt i32 %0, 2
+ br i1 %.demorgan, label %GreaterThanTwo, label %LessThanOrEqualToTwo
+
+GreaterThanTwo:
+; CHECK-NOT: icmp eq i32 %0, 2
+ icmp eq i32 %0, 2
+; CHECK: br i1 false
+ br i1 %1, label %Impossible, label %NotTwoAndGreaterThanTwo
+
+NotTwoAndGreaterThanTwo:
+ ret i32 2
+
+Impossible:
+ ret i32 1
+
+LessThanOrEqualToTwo:
+ ret i32 0
+}
+
+declare i32* @f(i32*)
+define void @test5(i32* %x, i32* %y) {
+; CHECK-LABEL: @test5(
+entry:
+ %pre = icmp eq i32* %x, null
+ br i1 %pre, label %return, label %loop
+
+loop:
+ %phi = phi i32* [ %sel, %loop ], [ %x, %entry ]
+; CHECK: %phi = phi i32* [ %f, %loop ], [ %x, %entry ]
+ %f = tail call i32* @f(i32* %phi)
+ %cmp1 = icmp ne i32* %f, %y
+ %sel = select i1 %cmp1, i32* %f, i32* null
+ %cmp2 = icmp eq i32* %sel, null
+ br i1 %cmp2, label %return, label %loop
+
+return:
+ ret void
+}
+
+define i32 @switch1(i32 %s) {
+; CHECK-LABEL: @switch1(
+entry:
+ %cmp = icmp slt i32 %s, 0
+ br i1 %cmp, label %negative, label %out
+
+negative:
+ switch i32 %s, label %out [
+; CHECK: switch i32 %s, label %out
+ i32 0, label %out
+; CHECK-NOT: i32 0
+ i32 1, label %out
+; CHECK-NOT: i32 1
+ i32 -1, label %next
+; CHECK: i32 -1, label %next
+ i32 -2, label %next
+; CHECK: i32 -2, label %next
+ i32 2, label %out
+; CHECK-NOT: i32 2
+ i32 3, label %out
+; CHECK-NOT: i32 3
+ ]
+
+out:
+ %p = phi i32 [ 1, %entry ], [ -1, %negative ], [ -1, %negative ], [ -1, %negative ], [ -1, %negative ], [ -1, %negative ]
+ ret i32 %p
+
+next:
+ %q = phi i32 [ 0, %negative ], [ 0, %negative ]
+ ret i32 %q
+}
+
+define i32 @switch2(i32 %s) {
+; CHECK-LABEL: @switch2(
+entry:
+ %cmp = icmp sgt i32 %s, 0
+ br i1 %cmp, label %positive, label %out
+
+positive:
+ switch i32 %s, label %out [
+ i32 0, label %out
+ i32 -1, label %next
+ i32 -2, label %next
+ ]
+; CHECK: br label %out
+
+out:
+ %p = phi i32 [ -1, %entry ], [ 1, %positive ], [ 1, %positive ]
+ ret i32 %p
+
+next:
+ %q = phi i32 [ 0, %positive ], [ 0, %positive ]
+ ret i32 %q
+}
+
+define i32 @switch3(i32 %s) {
+; CHECK-LABEL: @switch3(
+entry:
+ %cmp = icmp sgt i32 %s, 0
+ br i1 %cmp, label %positive, label %out
+
+positive:
+ switch i32 %s, label %out [
+ i32 -1, label %out
+ i32 -2, label %next
+ i32 -3, label %next
+ ]
+; CHECK: br label %out
+
+out:
+ %p = phi i32 [ -1, %entry ], [ 1, %positive ], [ 1, %positive ]
+ ret i32 %p
+
+next:
+ %q = phi i32 [ 0, %positive ], [ 0, %positive ]
+ ret i32 %q
+}
+
+define void @switch4(i32 %s) {
+; CHECK-LABEL: @switch4(
+entry:
+ %cmp = icmp eq i32 %s, 0
+ br i1 %cmp, label %zero, label %out
+
+zero:
+ switch i32 %s, label %out [
+ i32 0, label %next
+ i32 1, label %out
+ i32 -1, label %out
+ ]
+; CHECK: br label %next
+
+out:
+ ret void
+
+next:
+ ret void
+}