mirror of
https://github.com/c64scene-ar/llvm-6502.git
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ee28e0fdd1
This patch extends FoldBranchToCommonDest to fold unconditional branches. For unconditional branches, we fold them if it is easy to update the phi nodes in the common successors. rdar://10554090 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@158392 91177308-0d34-0410-b5e6-96231b3b80d8
53 lines
1.2 KiB
LLVM
53 lines
1.2 KiB
LLVM
; RUN: opt < %s -simplifycfg -S | FileCheck %s
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define void @test(i32* %P, i32* %Q, i1 %A, i1 %B) {
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; CHECK: test
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; CHECK: br i1
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; CHECK-NOT: br i1
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; CHECK: ret
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; CHECK: ret
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entry:
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br i1 %A, label %a, label %b
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a:
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br i1 %B, label %b, label %c
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b:
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store i32 123, i32* %P
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ret void
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c:
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ret void
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}
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; rdar://10554090
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define zeroext i1 @test2(i64 %i0, i64 %i1) nounwind uwtable readonly ssp {
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entry:
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; CHECK: test2
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; CHECK: br i1
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%and.i.i = and i64 %i0, 281474976710655
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%and.i11.i = and i64 %i1, 281474976710655
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%or.cond = icmp eq i64 %and.i.i, %and.i11.i
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br i1 %or.cond, label %c, label %a
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a:
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; CHECK: br
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%shr.i4.i = lshr i64 %i0, 48
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%and.i5.i = and i64 %shr.i4.i, 32767
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%shr.i.i = lshr i64 %i1, 48
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%and.i2.i = and i64 %shr.i.i, 32767
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%cmp9.i = icmp ult i64 %and.i5.i, %and.i2.i
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br i1 %cmp9.i, label %c, label %b
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b:
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; CHECK-NOT: br
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%shr.i13.i9 = lshr i64 %i1, 48
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%and.i14.i10 = and i64 %shr.i13.i9, 32767
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%shr.i.i11 = lshr i64 %i0, 48
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%and.i11.i12 = and i64 %shr.i.i11, 32767
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%phitmp = icmp uge i64 %and.i14.i10, %and.i11.i12
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br label %c
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c:
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%o2 = phi i1 [ false, %a ], [ %phitmp, %b ], [ false, %entry ]
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ret i1 %o2
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}
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