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llvm-project/llvm/test/CodeGen/X86/compare-global.ll

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Re-apply r286384, "X86: Introduce the "relocImm" ComplexPattern, which represents a relocatable immediate.", with a fix for 32-bit x86. Teach X86InstrInfo::analyzeCompare() not to crash on CMP and SUB instructions that take a global address operand. llvm-svn: 286420
2016-11-10 07:53:43 +08:00
; RUN: llc -o - %s | FileCheck %s
target datalayout = "e-m:x-p:32:32-i64:64-f80:32-n8:16:32-a:0:32-S32"
target triple = "i686-pc-windows-msvc18.0.0"
@foo = external global i8
define void @f(i8* %c) {
entry:
X86: Teach X86InstrInfo::analyzeCompare to recognize compares of symbols. This requires that we communicate to X86InstrInfo::optimizeCompareInstr that the second operand is neither a register nor an immediate. The way we do that is by setting CmpMask to zero. Note that there were already instructions where the second operand was not a register nor an immediate, namely X86::SUB*rm, so also set CmpMask to zero for those instructions. This seems like a latent bug, but I was unable to trigger it. Differential Revision: https://reviews.llvm.org/D28621 llvm-svn: 294634
2017-02-10 05:58:24 +08:00
; CHECK: cmpl $_foo, 4(%esp)
Re-apply r286384, "X86: Introduce the "relocImm" ComplexPattern, which represents a relocatable immediate.", with a fix for 32-bit x86. Teach X86InstrInfo::analyzeCompare() not to crash on CMP and SUB instructions that take a global address operand. llvm-svn: 286420
2016-11-10 07:53:43 +08:00
%cmp = icmp eq i8* %c, @foo
br i1 %cmp, label %if.then, label %if.end
if.then:
tail call void @g()
br label %if.end
if.end:
ret void
}
declare void @g()