-; RUN: opt < %s -jump-threading -S | FileCheck %s
+; RUN: opt -jump-threading -S < %s | FileCheck %s
declare i32 @f1()
declare i32 @f2()
declare void @f3()
define i32 @test1(i1 %cond) {
-; CHECK: @test1
+; CHECK-LABEL: @test1(
br i1 %cond, label %T1, label %F1
;; cond is known false on Entry -> F1 edge!
define i32 @test2(i1 %cond) {
-; CHECK: @test2
+; CHECK-LABEL: @test2(
Entry:
br i1 %cond, label %T1, label %F1
; Undef handling.
define i32 @test3(i1 %cond) {
-; CHECK: @test3
+; CHECK-LABEL: @test3(
; CHECK-NEXT: T1:
; CHECK-NEXT: ret i32 42
br i1 undef, label %T1, label %F1
}
define i32 @test4(i1 %cond, i1 %cond2) {
-; CHECK: @test4
+; CHECK-LABEL: @test4(
br i1 %cond, label %T1, label %F1
ret i32 %B
}
+
+;; This tests that the branch in 'merge' can be cloned up into T1.
+define i32 @test5(i1 %cond, i1 %cond2) {
+; CHECK-LABEL: @test5(
+
+ br i1 %cond, label %T1, label %F1
+
+T1:
+; CHECK: T1:
+; CHECK-NEXT: %v1 = call i32 @f1()
+; CHECK-NEXT: %cond3 = icmp eq i32 %v1, 412
+; CHECK-NEXT: br i1 %cond3, label %T2, label %F2
+
+ %v1 = call i32 @f1()
+ %cond3 = icmp eq i32 %v1, 412
+ br label %Merge
+
+F1:
+ %v2 = call i32 @f2()
+ br label %Merge
+
+Merge:
+ %A = phi i1 [%cond3, %T1], [%cond2, %F1]
+ %B = phi i32 [%v1, %T1], [%v2, %F1]
+ br i1 %A, label %T2, label %F2
+
+T2:
+ call void @f3()
+ ret i32 %B
+
+F2:
+ ret i32 %B
+}
+
+
+;; Lexically duplicated conditionals should be threaded.
+
+
+define i32 @test6(i32 %A) {
+; CHECK-LABEL: @test6(
+ %tmp455 = icmp eq i32 %A, 42
+ br i1 %tmp455, label %BB1, label %BB2
+
+; CHECK: call i32 @f2()
+; CHECK-NEXT: ret i32 3
+
+; CHECK: call i32 @f1()
+; CHECK-NOT: br
+; CHECK: call void @f3()
+; CHECK-NOT: br
+; CHECK: ret i32 4
+
+BB2:
+ call i32 @f1()
+ br label %BB1
+
+
+BB1:
+ %tmp459 = icmp eq i32 %A, 42
+ br i1 %tmp459, label %BB3, label %BB4
+
+BB3:
+ call i32 @f2()
+ ret i32 3
+
+BB4:
+ call void @f3()
+ ret i32 4
+}
+
+
+;; This tests that the branch in 'merge' can be cloned up into T1.
+;; rdar://7367025
+define i32 @test7(i1 %cond, i1 %cond2) {
+Entry:
+; CHECK-LABEL: @test7(
+ %v1 = call i32 @f1()
+ br i1 %cond, label %Merge, label %F1
+
+F1:
+ %v2 = call i32 @f2()
+ br label %Merge
+
+Merge:
+ %B = phi i32 [%v1, %Entry], [%v2, %F1]
+ %M = icmp ne i32 %B, %v1
+ %N = icmp eq i32 %B, 47
+ %O = and i1 %M, %N
+ br i1 %O, label %T2, label %F2
+
+; CHECK: Merge:
+; CHECK-NOT: phi
+; CHECK-NEXT: %v2 = call i32 @f2()
+
+T2:
+ call void @f3()
+ ret i32 %B
+
+F2:
+ ret i32 %B
+; CHECK: F2:
+; CHECK-NEXT: phi i32
+}
+
+
+declare i1 @test8a()
+
+define i32 @test8b(i1 %cond, i1 %cond2) {
+; CHECK-LABEL: @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-LABEL: @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-LABEL: @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-LABEL: @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-LABEL: @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-LABEL: @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-LABEL: @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-LABEL: @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: }
+}
+
+; In this test we check that block duplication is inhibited by the presence
+; of a function with the 'noduplicate' attribute.
+
+declare void @g()
+declare void @j()
+declare void @k()
+
+; CHECK: define void @h(i32 %p) {
+define void @h(i32 %p) {
+ %x = icmp ult i32 %p, 5
+ br i1 %x, label %l1, label %l2
+
+l1:
+ call void @j()
+ br label %l3
+
+l2:
+ call void @k()
+ br label %l3
+
+l3:
+; CHECK: call void @g() [[NOD:#[0-9]+]]
+; CHECK-NOT: call void @g() [[NOD]]
+ call void @g() noduplicate
+ %y = icmp ult i32 %p, 5
+ br i1 %y, label %l4, label %l5
+
+l4:
+ call void @j()
+ ret void
+
+l5:
+ call void @k()
+ ret void
+; CHECK: }
+}
+
+; CHECK: attributes [[NOD]] = { noduplicate }
projects / oota-llvm.git / blobdiff