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https://github.com/c64scene-ar/llvm-6502.git
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53eaf1e431
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2705 91177308-0d34-0410-b5e6-96231b3b80d8
40 lines
1.2 KiB
LLVM
40 lines
1.2 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: as < %s | opt -sccp -simplifycfg | dis | grep ret
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void "old_main"() {
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bb3: ;[#uses=1]
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br label %bb6
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bb6: ;[#uses=3]
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%reg403 = phi int [ %reg155, %bb14 ], [ 0, %bb3 ] ; <int> [#uses=2]
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%reg155 = add int %reg403, 1 ; <int> [#uses=3]
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br label %bb11
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bb11:
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%reg407 = phi int [ %reg408, %bb11 ], [ 0, %bb6 ] ; <int> [#uses=2]
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%reg408 = add int %reg407, 1 ; <int> [#uses=2]
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%cond550 = setle int %reg407, 1 ; <bool> [#uses=1]
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br bool %cond550, label %bb11, label %bb12
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bb12: ;[#uses=2]
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br label %bb13
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bb13: ;[#uses=3]
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%reg409 = phi int [ %reg410, %bb13 ], [ 0, %bb12 ] ; <int> [#uses=1]
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%reg410 = add int %reg409, 1 ; <int> [#uses=2]
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%cond552 = setle int %reg410, 2 ; <bool> [#uses=1]
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br bool %cond552, label %bb13, label %bb14
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bb14: ;[#uses=2]
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%cond553 = setle int %reg155, 31 ; <bool> [#uses=1]
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br bool %cond553, label %bb6, label %bb15
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bb15: ;[#uses=1]
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ret void
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}
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