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r338599 | vlad.tsyrklevich | 2018-08-01 19:44:37 +0200 (Wed, 01 Aug 2018) | 16 lines
[X86] FastISel fall back on !absolute_symbol GVs
Summary:
D25878, which added support for !absolute_symbol for normal X86 ISel,
did not add support for materializing references to absolute symbols for
X86 FastISel. This causes build failures because FastISel generates
PC-relative relocations for absolute symbols. Fall back to normal ISel
for references to !absolute_symbol GVs. Fix for PR38200.
Reviewers: pcc, craig.topper
Reviewed By: pcc
Subscribers: hiraditya, llvm-commits, kcc
Differential Revision: https://reviews.llvm.org/D50116
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_70@338847
91177308-0d34-0410-b5e6-
96231b3b80d8
if (GV->isThreadLocal())
return false;
+ // Can't handle !absolute_symbol references yet.
+ if (GV->isAbsoluteSymbolRef())
+ return false;
+
// RIP-relative addresses can't have additional register operands, so if
// we've already folded stuff into the addressing mode, just force the
// global value into its own register, which we can use as the basereg.
--- /dev/null
+; RUN: llc < %s | FileCheck %s
+; RUN: llc -relocation-model=pic < %s | FileCheck %s
+
+; Regression test for PR38200
+
+target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-unknown-linux-gnu"
+
+@bit_mask8 = external hidden global i8, !absolute_symbol !0
+
+declare void @f()
+
+define void @foo8(i8* %ptr) noinline optnone {
+ %load = load i8, i8* %ptr
+ ; CHECK: movl $bit_mask8, %ecx
+ %and = and i8 %load, ptrtoint (i8* @bit_mask8 to i8)
+ %icmp = icmp eq i8 %and, 0
+ br i1 %icmp, label %t, label %f
+
+t:
+ call void @f()
+ ret void
+
+f:
+ ret void
+}
+
+!0 = !{i64 0, i64 256}