From: Jan Vesely <jan.vesely@rutgers.edu>
Date: Sat, 25 Jun 2016 18:24:16 +0000 (+0000)
Subject: AMDGPU/R600: Fix GlobalValue regressions.
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=d207fc4c12d5a4a2660fb925858811544119a07a;p=llvm

AMDGPU/R600: Fix GlobalValue regressions.

Don't cast GV expression to MCSymbolRefExpr. r272705 changed GV to binary
expressions by including offset even if the offset it 0
(we haven't hit this sooner since tested workloads don't include static offsets)
We don't really care about the type of expression, so set it directly.
Fixes: r272705

Consider section relative relocations. Since all const as data is in one boffer section relative is equivalent to abs32.
Fixes: r273166

Differential Revision: http://reviews.llvm.org/D21633

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@273785 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Target/AMDGPU/MCTargetDesc/AMDGPUELFObjectWriter.cpp b/lib/Target/AMDGPU/MCTargetDesc/AMDGPUELFObjectWriter.cpp
index 6031522b0d6..b4e3b8e896b 100644
--- a/lib/Target/AMDGPU/MCTargetDesc/AMDGPUELFObjectWriter.cpp
+++ b/lib/Target/AMDGPU/MCTargetDesc/AMDGPUELFObjectWriter.cpp
@@ -56,6 +56,8 @@ unsigned AMDGPUELFObjectWriter::getRelocType(MCContext &Ctx,
   default: break;
   case FK_PCRel_4:
     return ELF::R_AMDGPU_REL32;
+  case FK_SecRel_4:
+    return ELF::R_AMDGPU_ABS32;
   }
 
   llvm_unreachable("unhandled relocation type");
diff --git a/lib/Target/AMDGPU/MCTargetDesc/R600MCCodeEmitter.cpp b/lib/Target/AMDGPU/MCTargetDesc/R600MCCodeEmitter.cpp
index 381ef011cac..5e8e6ceb7ca 100644
--- a/lib/Target/AMDGPU/MCTargetDesc/R600MCCodeEmitter.cpp
+++ b/lib/Target/AMDGPU/MCTargetDesc/R600MCCodeEmitter.cpp
@@ -163,7 +163,6 @@ uint64_t R600MCCodeEmitter::getMachineOpValue(const MCInst &MI,
   }
 
   if (MO.isExpr()) {
-    const MCSymbolRefExpr *Expr = cast<MCSymbolRefExpr>(MO.getExpr());
     // We put rodata at the end of code section, then map the entire
     // code secetion as vtx buf. Thus the section relative address is the
     // correct one.
@@ -171,7 +170,7 @@ uint64_t R600MCCodeEmitter::getMachineOpValue(const MCInst &MI,
     // We can't easily get the order of the current one, so compare against
     // the first one and adjust offset.
     const unsigned offset = (&MO == &MI.getOperand(0)) ? 0 : 4;
-    Fixups.push_back(MCFixup::create(offset, Expr, FK_SecRel_4, MI.getLoc()));
+    Fixups.push_back(MCFixup::create(offset, MO.getExpr(), FK_SecRel_4, MI.getLoc()));
     return 0;
   }
 
diff --git a/test/CodeGen/AMDGPU/no-initializer-constant-addrspace.ll b/test/CodeGen/AMDGPU/no-initializer-constant-addrspace.ll
index 9a814b579de..9dd99efd997 100644
--- a/test/CodeGen/AMDGPU/no-initializer-constant-addrspace.ll
+++ b/test/CodeGen/AMDGPU/no-initializer-constant-addrspace.ll
@@ -1,19 +1,24 @@
-; RUN: llc -march=amdgcn -mcpu=SI -o /dev/null %s
-; RUN: llc -march=amdgcn -mcpu=tonga -o /dev/null %s
-; RUN: llc -march=r600 -mcpu=cypress -o /dev/null %s
+; RUN: llc -march=amdgcn -mcpu=SI -filetype=obj < %s | llvm-readobj -relocations -symbols | FileCheck %s -check-prefix=GCN
+; RUN: llc -march=amdgcn -mcpu=tonga -filetype=obj < %s | llvm-readobj -relocations -symbols | FileCheck %s -check-prefix=GCN
+; RUN: llc -march=r600 -mcpu=cypress -filetype=obj < %s | llvm-readobj -relocations -symbols | FileCheck %s -check-prefix=EG
 
+; GCN: R_AMDGPU_REL32 extern_const_addrspace
+; EG: R_AMDGPU_ABS32 extern_const_addrspace
+
+; CHECK-DAG: Name: extern_const_addrspace
 @extern_const_addrspace = external unnamed_addr addrspace(2) constant [5 x i32], align 4
 
-; FUNC-LABEL: {{^}}load_extern_const_init:
+; CHECK-DAG: Name: load_extern_const_init
 define void @load_extern_const_init(i32 addrspace(1)* %out) nounwind {
   %val = load i32, i32 addrspace(2)* getelementptr ([5 x i32], [5 x i32] addrspace(2)* @extern_const_addrspace, i64 0, i64 3), align 4
   store i32 %val, i32 addrspace(1)* %out, align 4
   ret void
 }
 
+; CHECK-DAG: Name: undef_const_addrspace
 @undef_const_addrspace = unnamed_addr addrspace(2) constant [5 x i32] undef, align 4
 
-; FUNC-LABEL: {{^}}load_undef_const_init:
+; CHECK-DAG: Name: undef_const_addrspace
 define void @load_undef_const_init(i32 addrspace(1)* %out) nounwind {
   %val = load i32, i32 addrspace(2)* getelementptr ([5 x i32], [5 x i32] addrspace(2)* @undef_const_addrspace, i64 0, i64 3), align 4
   store i32 %val, i32 addrspace(1)* %out, align 4