235c275b20
Summary: Attaching !absolute_symbol to a global variable does two things: 1) Marks it as an absolute symbol reference. 2) Specifies the value range of that symbol's address. Teach the X86 backend to allow absolute symbols to appear in place of immediates by extending the relocImm and mov64imm32 matchers. Start using relocImm in more places where it is legal. As previously proposed on llvm-dev: http://lists.llvm.org/pipermail/llvm-dev/2016-October/105800.html Differential Revision: https://reviews.llvm.org/D25878 llvm-svn: 289087
28 lines
641 B
LLVM
28 lines
641 B
LLVM
; RUN: llc < %s | FileCheck %s
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; RUN: llc -relocation-model=pic < %s | FileCheck %s
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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@align = external hidden global i8, !absolute_symbol !0
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declare void @f()
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define void @foo(i64 %val) {
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%shr = lshr i64 %val, zext (i8 ptrtoint (i8* @align to i8) to i64)
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%shl = shl i64 %val, zext (i8 sub (i8 64, i8 ptrtoint (i8* @align to i8)) to i64)
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; CHECK: rorq $align, %rdi
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%ror = or i64 %shr, %shl
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%cmp = icmp ult i64 %ror, 109
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br i1 %cmp, label %t, label %f
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t:
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call void @f()
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ret void
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f:
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ret void
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}
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!0 = !{i64 0, i64 256}
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