derek.holloway
7502bf64a4
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57 lines
1.5 KiB
LLVM
57 lines
1.5 KiB
LLVM
; REQUIRES: asserts
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; RUN: opt -S -passes=dfa-jump-threading -dfa-max-path-length=3 %s \
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; RUN: 2>&1 -disable-output -debug-only=dfa-jump-threading | FileCheck %s
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; RUN: opt -S -passes=dfa-jump-threading -dfa-max-num-visited-paths=3 %s \
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; RUN: 2>&1 -disable-output -debug-only=dfa-jump-threading | FileCheck %s
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; Make the path
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; < case1 case1.1 case1.2 case1.3 case1.4 for.inc for.body > [ 3, case1 ]
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; too long so that it is not jump-threaded.
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define i32 @max_path_length(i32 %num) {
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; CHECK-NOT: 3, case1
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; CHECK: < case2, for.inc, for.body > [ 1, for.inc ]
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; CHECK-NEXT: < for.inc, for.body > [ 1, for.inc ]
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; CHECK-NEXT: < case2, sel.si.unfold.false, for.inc, for.body > [ 2, sel.si.unfold.false ]
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; CHECK-NEXT: DFA-JT: Renaming non-local uses of:
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entry:
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br label %for.body
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for.body:
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%count = phi i32 [ 0, %entry ], [ %inc, %for.inc ]
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%state = phi i32 [ 1, %entry ], [ %state.next, %for.inc ]
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switch i32 %state, label %for.inc [
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i32 1, label %case1
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i32 2, label %case2
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]
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case1:
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%case1.state.next = phi i32 [ 3, %for.body ]
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br label %case1.1
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case1.1:
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br label %case1.2
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case1.2:
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br label %case1.3
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case1.3:
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br label %case1.4
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case1.4:
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br label %for.inc
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case2:
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%cmp = icmp eq i32 %count, 50
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%sel = select i1 %cmp, i32 1, i32 2
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br label %for.inc
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for.inc:
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%state.next = phi i32 [ %sel, %case2 ], [ 1, %for.body ], [ %case1.state.next, %case1.4 ]
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%inc = add nsw i32 %count, 1
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%cmp.exit = icmp slt i32 %inc, %num
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br i1 %cmp.exit, label %for.body, label %for.end
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for.end:
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ret i32 0
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}
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