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https://github.com/c64scene-ar/llvm-6502.git
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d138a7bb3f
Materializing full 64-bit constants on PPC64 can be expensive, requiring up to 5 instructions depending on the locations of the non-zero bits. Sometimes materializing the bit-reversed constant, and then flipping the bits, requires fewer instructions than the direct method. If so, do that instead. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225132 91177308-0d34-0410-b5e6-96231b3b80d8
21 lines
457 B
LLVM
21 lines
457 B
LLVM
; RUN: llc -mcpu=ppc64 < %s | FileCheck %s
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target datalayout = "E-m:e-i64:64-n32:64"
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target triple = "powerpc64-unknown-linux-gnu"
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; Function Attrs: nounwind readnone
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define i64 @cn1() #0 {
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entry:
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ret i64 281474976710655
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; CHECK-LABEL: @cn1
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; CHECK: li [[REG1:[0-9]+]], 0
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; CHECK: ori [[REG2:[0-9]+]], [[REG1]], 65535
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; CHECK: sldi [[REG3:[0-9]+]], [[REG2]], 48
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; CHECK: nor 3, [[REG3]], [[REG3]]
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; CHECK: blr
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}
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attributes #0 = { nounwind readnone }
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