forked from OSchip/llvm-project
34 lines
1.1 KiB
LLVM
34 lines
1.1 KiB
LLVM
; This test shows SCCP "proving" that the loop (from bb6 to 14) loops infinitely
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; this is in fact NOT the case, so the return should still be alive in the code
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; after sccp and CFG simplification have been performed.
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;
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; RUN: opt < %s -sccp -simplifycfg -S | \
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; RUN: grep ret
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define void @old_main() {
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bb3:
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br label %bb6
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bb6: ; preds = %bb14, %bb3
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%reg403 = phi i32 [ %reg155, %bb14 ], [ 0, %bb3 ] ; <i32> [#uses=1]
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%reg155 = add i32 %reg403, 1 ; <i32> [#uses=2]
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br label %bb11
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bb11: ; preds = %bb11, %bb6
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%reg407 = phi i32 [ %reg408, %bb11 ], [ 0, %bb6 ] ; <i32> [#uses=2]
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%reg408 = add i32 %reg407, 1 ; <i32> [#uses=1]
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%cond550 = icmp sle i32 %reg407, 1 ; <i1> [#uses=1]
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br i1 %cond550, label %bb11, label %bb12
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bb12: ; preds = %bb11
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br label %bb13
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bb13: ; preds = %bb13, %bb12
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%reg409 = phi i32 [ %reg410, %bb13 ], [ 0, %bb12 ] ; <i32> [#uses=1]
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%reg410 = add i32 %reg409, 1 ; <i32> [#uses=2]
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%cond552 = icmp sle i32 %reg410, 2 ; <i1> [#uses=1]
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br i1 %cond552, label %bb13, label %bb14
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bb14: ; preds = %bb13
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%cond553 = icmp sle i32 %reg155, 31 ; <i1> [#uses=1]
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br i1 %cond553, label %bb6, label %bb15
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bb15: ; preds = %bb14
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ret void
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}
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