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a2d4395226
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
29 lines
770 B
LLVM
29 lines
770 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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@foo = external global i8, align 1, !absolute_symbol !0
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define void @bar(i8* %x) {
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entry:
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%0 = load i8, i8* %x, align 1
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%conv = sext i8 %0 to i32
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; CHECK: testb $foo, (%rdi)
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%and = and i32 %conv, sext (i8 ptrtoint (i8* @foo to i8) to i32)
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%tobool = icmp eq i32 %and, 0
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br i1 %tobool, label %if.end, label %if.then
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if.then: ; preds = %entry
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tail call void (...) @xf()
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br label %if.end
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if.end: ; preds = %entry, %if.then
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ret void
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}
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declare void @xf(...)
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!0 = !{i32 0, i32 256}
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