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clang-p2996/llvm/test/Transforms/SimplifyCFG/jump-threading.ll
Nikita Popov 884e9a877b [SimplifyCFG] Replace condition value when threading 
Replace the condition value with the known constant value on the
threaded edge. This happens implicitly with phi threading because
we replace with the incoming value, but not for non-phi threading.
2022-04-29 09:50:27 +02:00

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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -S -simplifycfg < %s | FileCheck %s
declare void @foo()
declare void @bar()
declare void @use.i1(i1)
define void @test_phi_simple(i1 %c) {
; CHECK-LABEL: @test_phi_simple(
; CHECK-NEXT: br i1 [[C:%.*]], label [[IF:%.*]], label [[ELSE:%.*]]
; CHECK: if:
; CHECK-NEXT: call void @foo()
; CHECK-NEXT: call void @foo()
; CHECK-NEXT: br label [[JOIN2:%.*]]
; CHECK: else:
; CHECK-NEXT: call void @bar()
; CHECK-NEXT: call void @bar()
; CHECK-NEXT: br label [[JOIN2]]
; CHECK: join2:
; CHECK-NEXT: ret void
;
br i1 %c, label %if, label %else
if:
call void @foo()
br label %join
else:
call void @bar()
br label %join
join:
%c2 = phi i1 [ true, %if ], [ false, %else ]
br i1 %c2, label %if2, label %else2
if2:
call void @foo()
br label %join2
else2:
call void @bar()
br label %join2
join2:
ret void
}
define void @test_phi_extra_use(i1 %c) {
; CHECK-LABEL: @test_phi_extra_use(
; CHECK-NEXT: br i1 [[C:%.*]], label [[IF:%.*]], label [[ELSE:%.*]]
; CHECK: if:
; CHECK-NEXT: call void @foo()
; CHECK-NEXT: call void @use.i1(i1 true)
; CHECK-NEXT: call void @foo()
; CHECK-NEXT: br label [[JOIN2:%.*]]
; CHECK: else:
; CHECK-NEXT: call void @bar()
; CHECK-NEXT: call void @use.i1(i1 false)
; CHECK-NEXT: call void @bar()
; CHECK-NEXT: br label [[JOIN2]]
; CHECK: join2:
; CHECK-NEXT: ret void
;
br i1 %c, label %if, label %else
if:
call void @foo()
br label %join
else:
call void @bar()
br label %join
join:
%c2 = phi i1 [ true, %if ], [ false, %else ]
call void @use.i1(i1 %c2)
br i1 %c2, label %if2, label %else2
if2:
call void @foo()
br label %join2
else2:
call void @bar()
br label %join2
join2:
ret void
}
define void @test_phi_extra_use_different_block(i1 %c) {
; CHECK-LABEL: @test_phi_extra_use_different_block(
; CHECK-NEXT: br i1 [[C:%.*]], label [[IF:%.*]], label [[ELSE:%.*]]
; CHECK: if:
; CHECK-NEXT: call void @foo()
; CHECK-NEXT: br label [[JOIN:%.*]]
; CHECK: else:
; CHECK-NEXT: call void @bar()
; CHECK-NEXT: br label [[JOIN]]
; CHECK: join:
; CHECK-NEXT: [[C2:%.*]] = phi i1 [ true, [[IF]] ], [ false, [[ELSE]] ]
; CHECK-NEXT: br i1 [[C2]], label [[IF2:%.*]], label [[ELSE2:%.*]]
; CHECK: if2:
; CHECK-NEXT: call void @use.i1(i1 [[C2]])
; CHECK-NEXT: call void @foo()
; CHECK-NEXT: br label [[JOIN2:%.*]]
; CHECK: else2:
; CHECK-NEXT: call void @use.i1(i1 [[C2]])
; CHECK-NEXT: call void @bar()
; CHECK-NEXT: br label [[JOIN2]]
; CHECK: join2:
; CHECK-NEXT: ret void
;
br i1 %c, label %if, label %else
if:
call void @foo()
br label %join
else:
call void @bar()
br label %join
join:
%c2 = phi i1 [ true, %if ], [ false, %else ]
br i1 %c2, label %if2, label %else2
if2:
call void @use.i1(i1 %c2)
call void @foo()
br label %join2
else2:
call void @use.i1(i1 %c2)
call void @bar()
br label %join2
join2:
ret void
}
define void @test_same_cond_simple(i1 %c) {
; CHECK-LABEL: @test_same_cond_simple(
; CHECK-NEXT: br i1 [[C:%.*]], label [[IF:%.*]], label [[ELSE:%.*]]
; CHECK: if:
; CHECK-NEXT: call void @foo()
; CHECK-NEXT: call void @foo()
; CHECK-NEXT: br label [[JOIN2:%.*]]
; CHECK: else:
; CHECK-NEXT: call void @bar()
; CHECK-NEXT: call void @bar()
; CHECK-NEXT: br label [[JOIN2]]
; CHECK: join2:
; CHECK-NEXT: ret void
;
br i1 %c, label %if, label %else
if:
call void @foo()
br label %join
else:
call void @bar()
br label %join
join:
br i1 %c, label %if2, label %else2
if2:
call void @foo()
br label %join2
else2:
call void @bar()
br label %join2
join2:
ret void
}
define void @test_same_cond_extra_use(i1 %c) {
; CHECK-LABEL: @test_same_cond_extra_use(
; CHECK-NEXT: br i1 [[C:%.*]], label [[IF:%.*]], label [[ELSE:%.*]]
; CHECK: if:
; CHECK-NEXT: call void @foo()
; CHECK-NEXT: call void @use.i1(i1 true)
; CHECK-NEXT: call void @foo()
; CHECK-NEXT: br label [[JOIN2:%.*]]
; CHECK: else:
; CHECK-NEXT: call void @bar()
; CHECK-NEXT: call void @use.i1(i1 false)
; CHECK-NEXT: call void @bar()
; CHECK-NEXT: br label [[JOIN2]]
; CHECK: join2:
; CHECK-NEXT: ret void
;
br i1 %c, label %if, label %else
if:
call void @foo()
br label %join
else:
call void @bar()
br label %join
join:
call void @use.i1(i1 %c)
br i1 %c, label %if2, label %else2
if2:
call void @foo()
br label %join2
else2:
call void @bar()
br label %join2
join2:
ret void
}
define void @test_same_cond_extra_use_different_block(i1 %c) {
; CHECK-LABEL: @test_same_cond_extra_use_different_block(
; CHECK-NEXT: br i1 [[C:%.*]], label [[IF:%.*]], label [[ELSE:%.*]]
; CHECK: if:
; CHECK-NEXT: call void @foo()
; CHECK-NEXT: call void @use.i1(i1 [[C]])
; CHECK-NEXT: call void @foo()
; CHECK-NEXT: br label [[JOIN2:%.*]]
; CHECK: else:
; CHECK-NEXT: call void @bar()
; CHECK-NEXT: call void @use.i1(i1 [[C]])
; CHECK-NEXT: call void @bar()
; CHECK-NEXT: br label [[JOIN2]]
; CHECK: join2:
; CHECK-NEXT: ret void
;
br i1 %c, label %if, label %else
if:
call void @foo()
br label %join
else:
call void @bar()
br label %join
join:
br i1 %c, label %if2, label %else2
if2:
call void @use.i1(i1 %c)
call void @foo()
br label %join2
else2:
call void @use.i1(i1 %c)
call void @bar()
br label %join2
join2:
ret void
}
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