derek.holloway
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63 lines
2.7 KiB
LLVM
63 lines
2.7 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
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; RUN: opt < %s -passes=simplifycfg -simplifycfg-require-and-preserve-domtree=1 --keep-loops="true" -S | FileCheck --check-prefix=NO-THREADING %s
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; Checks that we do not thread the control flow through the loop header loop_header as
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; that will introduce a non-canonical loop.
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; RUN: opt < %s -passes=simplifycfg -simplifycfg-require-and-preserve-domtree=1 --keep-loops="false" -S | FileCheck --check-prefix=THREADING %s
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; Checks that we thread the control flow through the loop header loop_header since we
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; do not request --keep-loops.
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define void @__start(i1 %cond) {
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; NO-THREADING-LABEL: define void @__start(
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; NO-THREADING-SAME: i1 [[COND:%.*]]) {
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; NO-THREADING-NEXT: [[ENTRY:.*:]]
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; NO-THREADING-NEXT: br label %[[LOOP_HEADER:.*]]
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; NO-THREADING: [[LOOP_HEADER]]:
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; NO-THREADING-NEXT: br i1 [[COND]], label %[[LOOP_BODY_1:.*]], label %[[LOOP_BODY_0:.*]]
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; NO-THREADING: [[LOOP_BODY_0]]:
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; NO-THREADING-NEXT: [[_0_:%.*]] = add i16 0, 0
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; NO-THREADING-NEXT: br label %[[LOOP_EXIT:.*]]
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; NO-THREADING: [[LOOP_BODY_1]]:
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; NO-THREADING-NEXT: [[_1_:%.*]] = add i32 0, 1
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; NO-THREADING-NEXT: br label %[[LOOP_EXIT]]
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; NO-THREADING: [[LOOP_EXIT]]:
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; NO-THREADING-NEXT: br i1 [[COND]], label %[[LOOP_HEADER]], label %[[EXIT:.*]]
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; NO-THREADING: [[EXIT]]:
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; NO-THREADING-NEXT: ret void
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;
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; THREADING-LABEL: define void @__start(
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; THREADING-SAME: i1 [[COND:%.*]]) {
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; THREADING-NEXT: [[ENTRY:.*:]]
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; THREADING-NEXT: br i1 [[COND]], label %[[LOOP_BODY_1:.*]], label %[[LOOP_BODY_0:.*]]
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; THREADING: [[LOOP_BODY_0]]:
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; THREADING-NEXT: [[_0_:%.*]] = add i16 0, 0
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; THREADING-NEXT: br label %[[LOOP_EXIT:.*]]
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; THREADING: [[LOOP_BODY_1]]:
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; THREADING-NEXT: [[_1_:%.*]] = add i32 0, 1
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; THREADING-NEXT: br label %[[LOOP_EXIT]]
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; THREADING: [[LOOP_EXIT]]:
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; THREADING-NEXT: br i1 [[COND]], label %[[LOOP_BODY_1]], label %[[EXIT:.*]]
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; THREADING: [[EXIT]]:
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; THREADING-NEXT: ret void
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;
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entry:
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br label %loop_header
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loop_header: ; preds = %loop_exit, %entry
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br i1 %cond, label %loop_body_1, label %loop_body_0
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loop_body_0: ; preds = %loop_header
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%_0_ = add i16 0, 0
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br label %loop_exit
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loop_body_1: ; preds = %loop_header
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%_1_ = add i32 0, 1
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br label %loop_exit
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loop_exit: ; preds = %loop_body_1, %loop_body_0
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br i1 %cond, label %loop_header, label %exit
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exit: ; preds = %loop_exit
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ret void
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}
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