-; RUN: opt < %s -jump-threading -S | FileCheck %s
+; RUN: opt %s -jump-threading -S | FileCheck %s
declare i32 @f1()
declare i32 @f2()
; CHECK: @test6
%tmp455 = icmp eq i32 %A, 42
br i1 %tmp455, label %BB1, label %BB2
-
-BB2:
+
+; CHECK: call i32 @f2()
+; CHECK-NEXT: ret i32 3
+
; CHECK: call i32 @f1()
-; CHECK-NEXT: call void @f3()
-; CHECK-NEXT: ret i32 4
+; CHECK-NOT: br
+; CHECK: call void @f3()
+; CHECK-NOT: br
+; CHECK: ret i32 4
+
+BB2:
call i32 @f1()
br label %BB1
; CHECK-NEXT: phi i32
}
+
+declare i1 @test8a()
+
+define i32 @test8b(i1 %cond, i1 %cond2) {
+; CHECK: @test8b
+T0:
+ %A = call i1 @test8a()
+ br i1 %A, label %T1, label %F1
+
+; CHECK: T0:
+; CHECK-NEXT: call
+; CHECK-NEXT: br i1 %A, label %T1, label %Y
+
+T1:
+ %B = call i1 @test8a()
+ br i1 %B, label %T2, label %F1
+
+; CHECK: T1:
+; CHECK-NEXT: call
+; CHECK-NEXT: br i1 %B, label %T2, label %Y
+T2:
+ %C = call i1 @test8a()
+ br i1 %cond, label %T3, label %F1
+
+; CHECK: T2:
+; CHECK-NEXT: call
+; CHECK-NEXT: br i1 %cond, label %T3, label %Y
+T3:
+ ret i32 0
+
+F1:
+ %D = phi i32 [0, %T0], [0, %T1], [1, %T2]
+ %E = icmp eq i32 %D, 1
+ %F = and i1 %E, %cond
+ br i1 %F, label %X, label %Y
+X:
+ call i1 @test8a()
+ ret i32 1
+Y:
+ ret i32 2
+}
+
+
+;;; Verify that we can handle constraint propagation through "xor x, 1".
+define i32 @test9(i1 %cond, i1 %cond2) {
+Entry:
+; CHECK: @test9
+ %v1 = call i32 @f1()
+ br i1 %cond, label %Merge, label %F1
+
+; CHECK: Entry:
+; CHECK-NEXT: %v1 = call i32 @f1()
+; CHECK-NEXT: br i1 %cond, label %F2, label %Merge
+
+F1:
+ %v2 = call i32 @f2()
+ br label %Merge
+
+Merge:
+ %B = phi i32 [%v1, %Entry], [%v2, %F1]
+ %M = icmp eq i32 %B, %v1
+ %M1 = xor i1 %M, 1
+ %N = icmp eq i32 %B, 47
+ %O = and i1 %M1, %N
+ br i1 %O, label %T2, label %F2
+
+; CHECK: Merge:
+; CHECK-NOT: phi
+; CHECK-NEXT: %v2 = call i32 @f2()
+
+T2:
+ %Q = zext i1 %M to i32
+ ret i32 %Q
+
+F2:
+ ret i32 %B
+; CHECK: F2:
+; CHECK-NEXT: phi i32
+}
+
+
+
+; CHECK: @test10
+declare i32 @test10f1()
+declare i32 @test10f2()
+declare void @test10f3()
+
+;; Non-local condition threading.
+define i32 @test10g(i1 %cond) {
+; CHECK: @test10g
+; CHECK-NEXT: br i1 %cond, label %T2, label %F2
+ br i1 %cond, label %T1, label %F1
+
+T1:
+ %v1 = call i32 @test10f1()
+ br label %Merge
+
+; CHECK: %v1 = call i32 @test10f1()
+; CHECK-NEXT: call void @f3()
+; CHECK-NEXT: ret i32 %v1
+
+F1:
+ %v2 = call i32 @test10f2()
+ br label %Merge
+
+Merge:
+ %B = phi i32 [%v1, %T1], [%v2, %F1]
+ br i1 %cond, label %T2, label %F2
+
+T2:
+ call void @f3()
+ ret i32 %B
+
+F2:
+ ret i32 %B
+}
+
+
+; Impossible conditional constraints should get threaded. BB3 is dead here.
+define i32 @test11(i32 %A) {
+; CHECK: @test11
+; CHECK-NEXT: icmp
+; CHECK-NEXT: br i1 %tmp455, label %BB4, label %BB2
+ %tmp455 = icmp eq i32 %A, 42
+ br i1 %tmp455, label %BB1, label %BB2
+
+BB2:
+; CHECK: call i32 @f1()
+; CHECK-NEXT: ret i32 %C
+ %C = call i32 @f1()
+ ret i32 %C
+
+
+BB1:
+ %tmp459 = icmp eq i32 %A, 43
+ br i1 %tmp459, label %BB3, label %BB4
+
+BB3:
+ call i32 @f2()
+ ret i32 3
+
+BB4:
+ call void @f3()
+ ret i32 4
+}
+
+;; Correlated value through boolean expression. GCC PR18046.
+define void @test12(i32 %A) {
+; CHECK: @test12
+entry:
+ %cond = icmp eq i32 %A, 0
+ br i1 %cond, label %bb, label %bb1
+; Should branch to the return block instead of through BB1.
+; CHECK: entry:
+; CHECK-NEXT: %cond = icmp eq i32 %A, 0
+; CHECK-NEXT: br i1 %cond, label %bb1, label %return
+
+bb:
+ %B = call i32 @test10f2()
+ br label %bb1
+
+bb1:
+ %C = phi i32 [ %A, %entry ], [ %B, %bb ]
+ %cond4 = icmp eq i32 %C, 0
+ br i1 %cond4, label %bb2, label %return
+
+; CHECK: bb1:
+; CHECK-NEXT: %B = call i32 @test10f2()
+; CHECK-NEXT: %cond4 = icmp eq i32 %B, 0
+; CHECK-NEXT: br i1 %cond4, label %bb2, label %return
+
+bb2:
+ %D = call i32 @test10f2()
+ ret void
+
+return:
+ ret void
+}
+
+
+;; Duplicate condition to avoid xor of cond.
+;; rdar://7391699
+define i32 @test13(i1 %cond, i1 %cond2) {
+Entry:
+; CHECK: @test13
+ %v1 = call i32 @f1()
+ br i1 %cond, label %Merge, label %F1
+
+F1:
+ br label %Merge
+
+Merge:
+ %B = phi i1 [true, %Entry], [%cond2, %F1]
+ %C = phi i32 [192, %Entry], [%v1, %F1]
+ %M = icmp eq i32 %C, 192
+ %N = xor i1 %B, %M
+ br i1 %N, label %T2, label %F2
+
+T2:
+ ret i32 123
+
+F2:
+ ret i32 %v1
+
+; CHECK: br i1 %cond, label %F2, label %Merge
+
+; CHECK: Merge:
+; CHECK-NEXT: %M = icmp eq i32 %v1, 192
+; CHECK-NEXT: %N = xor i1 %cond2, %M
+; CHECK-NEXT: br i1 %N, label %T2, label %F2
+}
+
+; CHECK: @test14
+define i32 @test14(i32 %in) {
+entry:
+ %A = icmp eq i32 %in, 0
+; CHECK: br i1 %A, label %right_ret, label %merge
+ br i1 %A, label %left, label %right
+
+; CHECK-NOT: left:
+left:
+ br label %merge
+
+; CHECK-NOT: right:
+right:
+ %B = call i32 @f1()
+ br label %merge
+
+merge:
+; CHECK-NOT: %C = phi i32 [%in, %left], [%B, %right]
+ %C = phi i32 [%in, %left], [%B, %right]
+ %D = add i32 %C, 1
+ %E = icmp eq i32 %D, 2
+ br i1 %E, label %left_ret, label %right_ret
+
+; CHECK: left_ret:
+left_ret:
+ ret i32 0
+
+right_ret:
+ ret i32 1
+}
+
+; PR5652
+; CHECK: @test15
+define i32 @test15(i32 %len) {
+entry:
+; CHECK: icmp ult i32 %len, 13
+ %tmp = icmp ult i32 %len, 13
+ br i1 %tmp, label %check, label %exit0
+
+exit0:
+ ret i32 0
+
+check:
+ %tmp9 = icmp ult i32 %len, 21
+ br i1 %tmp9, label %exit1, label %exit2
+
+exit2:
+; CHECK-NOT: ret i32 2
+ ret i32 2
+
+exit1:
+ ret i32 1
+; CHECK: }
+}
+
projects / oota-llvm.git / blobdiff