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clang-p2996/llvm/test/Transforms/SimplifyCFG/jump-threading.ll
Nikita Popov d727505e40 [SimplifyCFG] Remove one-use limitation in FoldCondBranchOnPHI() 
BlockIsSimpleEnoughToThreadThrough() already checks that the phi
(and all other instructions) are not used outside the block, so
this one-use check is not necessary for legality. I also don't
see any reason why it would be necessary for profitability (in
fact, those extra uses will be replaced with constants, which
should be generally profitable).
2022-04-20 15:56:20 +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: br label [[JOIN:%.*]]
; CHECK: else:
; CHECK-NEXT: call void @bar()
; CHECK-NEXT: br label [[JOIN]]
; CHECK: join:
; CHECK-NEXT: br i1 [[C]], label [[IF2:%.*]], label [[ELSE2:%.*]]
; CHECK: if2:
; CHECK-NEXT: call void @foo()
; CHECK-NEXT: br label [[JOIN2:%.*]]
; CHECK: else2:
; 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: br label [[JOIN:%.*]]
; CHECK: else:
; CHECK-NEXT: call void @bar()
; CHECK-NEXT: br label [[JOIN]]
; CHECK: join:
; CHECK-NEXT: call void @use.i1(i1 [[C]])
; CHECK-NEXT: br i1 [[C]], label [[IF2:%.*]], label [[ELSE2:%.*]]
; CHECK: if2:
; CHECK-NEXT: call void @foo()
; CHECK-NEXT: br label [[JOIN2:%.*]]
; CHECK: else2:
; 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: br label [[JOIN:%.*]]
; CHECK: else:
; CHECK-NEXT: call void @bar()
; CHECK-NEXT: br label [[JOIN]]
; CHECK: join:
; CHECK-NEXT: br i1 [[C]], label [[IF2:%.*]], label [[ELSE2:%.*]]
; CHECK: if2:
; CHECK-NEXT: call void @use.i1(i1 [[C]])
; CHECK-NEXT: call void @foo()
; CHECK-NEXT: br label [[JOIN2:%.*]]
; CHECK: else2:
; 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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