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| ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -simplifycfg -S | FileCheck %s
define void @test1(i1 %C, i1* %BP) {
; CHECK-LABEL: @test1(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[TMP0:%.*]] = xor i1 [[C:%.*]], true
; CHECK-NEXT: call void @llvm.assume(i1 [[TMP0]])
; CHECK-NEXT: ret void
;
entry:
br i1 %C, label %T, label %F
T:
store i1 %C, i1* %BP
unreachable
F:
ret void
}
define void @test2() personality i32 (...)* @__gxx_personality_v0 {
; CHECK-LABEL: @test2(
; CHECK-NEXT: entry:
; CHECK-NEXT: call void @test2()
; CHECK-NEXT: ret void
;
entry:
invoke void @test2( )
to label %N unwind label %U
U:
%res = landingpad { i8* }
cleanup
unreachable
N:
ret void
}
declare i32 @__gxx_personality_v0(...)
define i32 @test3(i32 %v) {
; CHECK-LABEL: @test3(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[COND:%.*]] = icmp eq i32 [[V:%.*]], 2
; CHECK-NEXT: [[SPEC_SELECT:%.*]] = select i1 [[COND]], i32 2, i32 1
; CHECK-NEXT: ret i32 [[SPEC_SELECT]]
;
entry:
switch i32 %v, label %default [
i32 1, label %U
i32 2, label %T
]
default:
ret i32 1
U:
unreachable
T:
ret i32 2
}
;; We can either convert the following control-flow to a select or remove the
;; unreachable control flow because of the undef store of null. Make sure we do
;; the latter.
define void @test5(i1 %cond, i8* %ptr) {
; CHECK-LABEL: @test5(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[TMP0:%.*]] = xor i1 [[COND:%.*]], true
; CHECK-NEXT: call void @llvm.assume(i1 [[TMP0]])
; CHECK-NEXT: store i8 2, i8* [[PTR:%.*]], align 8
; CHECK-NEXT: ret void
;
entry:
br i1 %cond, label %bb1, label %bb3
bb3:
br label %bb2
bb1:
br label %bb2
bb2:
%ptr.2 = phi i8* [ %ptr, %bb3 ], [ null, %bb1 ]
store i8 2, i8* %ptr.2, align 8
ret void
}
define void @test5_no_null_opt(i1 %cond, i8* %ptr) #0 {
; CHECK-LABEL: @test5_no_null_opt(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[DOTPTR:%.*]] = select i1 [[COND:%.*]], i8* null, i8* [[PTR:%.*]]
; CHECK-NEXT: store i8 2, i8* [[DOTPTR]], align 8
; CHECK-NEXT: ret void
;
entry:
br i1 %cond, label %bb1, label %bb3
bb3:
br label %bb2
bb1:
br label %bb2
bb2:
%ptr.2 = phi i8* [ %ptr, %bb3 ], [ null, %bb1 ]
store i8 2, i8* %ptr.2, align 8
ret void
}
define void @test6(i1 %cond, i8* %ptr) {
; CHECK-LABEL: @test6(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[TMP0:%.*]] = xor i1 [[COND:%.*]], true
; CHECK-NEXT: call void @llvm.assume(i1 [[TMP0]])
; CHECK-NEXT: store i8 2, i8* [[PTR:%.*]], align 8
; CHECK-NEXT: ret void
;
entry:
br i1 %cond, label %bb1, label %bb2
bb1:
br label %bb2
bb2:
%ptr.2 = phi i8* [ %ptr, %entry ], [ null, %bb1 ]
store i8 2, i8* %ptr.2, align 8
ret void
}
define void @test6_no_null_opt(i1 %cond, i8* %ptr) #0 {
; CHECK-LABEL: @test6_no_null_opt(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[SPEC_SELECT:%.*]] = select i1 [[COND:%.*]], i8* null, i8* [[PTR:%.*]]
; CHECK-NEXT: store i8 2, i8* [[SPEC_SELECT]], align 8
; CHECK-NEXT: ret void
;
entry:
br i1 %cond, label %bb1, label %bb2
bb1:
br label %bb2
bb2:
%ptr.2 = phi i8* [ %ptr, %entry ], [ null, %bb1 ]
store i8 2, i8* %ptr.2, align 8
ret void
}
define i32 @test7(i1 %X) {
; CHECK-LABEL: @test7(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[TMP0:%.*]] = xor i1 [[X:%.*]], true
; CHECK-NEXT: call void @llvm.assume(i1 [[TMP0]])
; CHECK-NEXT: ret i32 0
;
entry:
br i1 %X, label %if, label %else
if:
call void undef()
br label %else
else:
%phi = phi i32 [ 0, %entry ], [ 1, %if ]
ret i32 %phi
}
define void @test8(i1 %X, void ()* %Y) {
; CHECK-LABEL: @test8(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[TMP0:%.*]] = xor i1 [[X:%.*]], true
; CHECK-NEXT: call void @llvm.assume(i1 [[TMP0]])
; CHECK-NEXT: call void [[Y:%.*]]()
; CHECK-NEXT: ret void
;
entry:
br i1 %X, label %if, label %else
if:
br label %else
else:
%phi = phi void ()* [ %Y, %entry ], [ null, %if ]
call void %phi()
ret void
}
define void @test8_no_null_opt(i1 %X, void ()* %Y) #0 {
; CHECK-LABEL: @test8_no_null_opt(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[SPEC_SELECT:%.*]] = select i1 [[X:%.*]], void ()* null, void ()* [[Y:%.*]]
; CHECK-NEXT: call void [[SPEC_SELECT]]()
; CHECK-NEXT: ret void
;
entry:
br i1 %X, label %if, label %else
if:
br label %else
else:
%phi = phi void ()* [ %Y, %entry ], [ null, %if ]
call void %phi()
ret void
}
attributes #0 = { "null-pointer-is-valid"="true" }
|