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https://github.com/c64scene-ar/llvm-6502.git
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2210c0bea8
tail merging support to handle more cases. - Recognize several cases where tail merging is beneficial even when the tail size is smaller than the generic threshold. - Make use of MachineInstrDesc::isBarrier to help detect non-fallthrough blocks. - Check for and avoid disrupting fall-through edges in more cases. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86871 91177308-0d34-0410-b5e6-96231b3b80d8
33 lines
1.1 KiB
LLVM
33 lines
1.1 KiB
LLVM
; RUN: llc < %s -mtriple=thumbv7-apple-darwin | FileCheck %s
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; There shouldn't be a unconditional branch at end of bb52.
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; rdar://7184787
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@posed = external global i64 ; <i64*> [#uses=1]
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define i1 @ab_bb52(i64 %.reload78, i64* %.out, i64* %.out1) nounwind {
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newFuncRoot:
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br label %bb52
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bb52.bb55_crit_edge.exitStub: ; preds = %bb52
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store i64 %0, i64* %.out
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store i64 %2, i64* %.out1
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ret i1 true
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bb52.bb53_crit_edge.exitStub: ; preds = %bb52
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store i64 %0, i64* %.out
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store i64 %2, i64* %.out1
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ret i1 false
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bb52: ; preds = %newFuncRoot
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; CHECK: movne
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; CHECK: moveq
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; CHECK: pop
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; CHECK-NEXT: LBB1_1:
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%0 = load i64* @posed, align 4 ; <i64> [#uses=3]
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%1 = sub i64 %0, %.reload78 ; <i64> [#uses=1]
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%2 = ashr i64 %1, 1 ; <i64> [#uses=3]
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%3 = icmp eq i64 %2, 0 ; <i1> [#uses=1]
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br i1 %3, label %bb52.bb55_crit_edge.exitStub, label %bb52.bb53_crit_edge.exitStub
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}
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