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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
52 lines
1.1 KiB
LLVM
52 lines
1.1 KiB
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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@bit_mask8 = external hidden global i8, !absolute_symbol !0
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@bit_mask32 = external hidden global i8, !absolute_symbol !1
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@bit_mask64 = external hidden global i8, !absolute_symbol !2
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declare void @f()
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define void @foo32(i32* %ptr) {
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%load = load i32, i32* %ptr
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%and = and i32 %load, 31
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%shl = shl i32 1, %and
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%and2 = and i32 %shl, ptrtoint (i8* @bit_mask32 to i32)
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; CHECK: movl $bit_mask32, %eax
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; CHECK: btl %ecx, %eax
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%icmp = icmp eq i32 %and2, 0
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br i1 %icmp, 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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define void @foo64(i64* %ptr) {
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%load = load i64, i64* %ptr
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%and = and i64 %load, 63
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%shl = shl i64 1, %and
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%and2 = and i64 %shl, ptrtoint (i8* @bit_mask64 to i64)
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; CHECK: movabsq $bit_mask64, %rax
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; CHECK: btq %rcx, %rax
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%icmp = icmp eq i64 %and2, 0
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br i1 %icmp, 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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!1 = !{i64 0, i64 4294967296}
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!2 = !{i64 -1, i64 -1}
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