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https://github.com/c64scene-ar/llvm-6502.git
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8979e5f372
This could probably be made a lot smarter, but this is a common case and doesn't require LVI to scan a lot of code. With this change CVP can optimize away the "shift == 0" case in Hashing.h that only gets hit when "shift" is in a range not containing 0. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@151919 91177308-0d34-0410-b5e6-96231b3b80d8
44 lines
742 B
LLVM
44 lines
742 B
LLVM
; RUN: opt -correlated-propagation -S < %s | FileCheck %s
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declare i32 @foo()
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define i32 @test1(i32 %a) nounwind {
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%a.off = add i32 %a, -8
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%cmp = icmp ult i32 %a.off, 8
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br i1 %cmp, label %then, label %else
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then:
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%dead = icmp eq i32 %a, 7
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br i1 %dead, label %end, label %else
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else:
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ret i32 1
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end:
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ret i32 2
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; CHECK: @test1
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; CHECK: then:
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; CHECK-NEXT: br i1 false, label %end, label %else
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}
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define i32 @test2(i32 %a) nounwind {
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%a.off = add i32 %a, -8
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%cmp = icmp ult i32 %a.off, 8
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br i1 %cmp, label %then, label %else
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then:
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%dead = icmp ugt i32 %a, 15
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br i1 %dead, label %end, label %else
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else:
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ret i32 1
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end:
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ret i32 2
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; CHECK: @test2
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; CHECK: then:
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; CHECK-NEXT: br i1 false, label %end, label %else
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}
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