Relocation against a symbol, instead of against section. We had some …

…extreme

test cases where there were a lot of relocations applied relative to a large
rodata section. Gas would create a symbol for each of these whereas we would
be relative to the beginning of the rodata section. This change mimics what
gas does.

Patch by Jack Carter.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146468 91177308-0d34-0410-b5e6-96231b3b80d8

lib/MC/ELFObjectWriter.cpp

@@ -1851,7 +1851,8 @@ const MCSymbol *MipsELFObjectWriter::ExplicitRelSym(const MCAssembler &Asm,
   assert(Target.getSymA() && "SymA cannot be 0.");
   const MCSymbol &Sym = Target.getSymA()->getSymbol();
 
-  if (Sym.getSection().getKind().isMergeable1ByteCString())
+  if (Sym.getSection().getKind().isMergeableCString() ||
+      Sym.getSection().getKind().isMergeableConst())
     return &Sym;
 
   return NULL;
@@ -1914,4 +1915,3 @@ unsigned MipsELFObjectWriter::GetRelocType(const MCValue &Target,
 
   return Type;
 }
-

test/CodeGen/Mips/DO-relsym.ll

@@ -0,0 +1,29 @@
+; RUN: llc -filetype=obj -mtriple mipsel-unknown-linux %s -o - | elf-dump --dump-section-data  | FileCheck %s
+
+; Check that the appropriate symbols were created.
+
+; CHECK: (('st_name', 0x{{[0-9|a-f]+}}) # '$.str'
+; CHECK: (('st_name', 0x{{[0-9|a-f]+}}) # '$.str1'
+; CHECK: (('st_name', 0x{{[0-9|a-f]+}}) # '$CPI0_0'
+; CHECK: (('st_name', 0x{{[0-9|a-f]+}}) # '$CPI0_1'
+
+@.str = private unnamed_addr constant [6 x i8] c"abcde\00", align 1
+@gc1 = external global i8*
+@.str1 = private unnamed_addr constant [5 x i8] c"fghi\00", align 1
+@gc2 = external global i8*
+@gd1 = external global double
+@gd2 = external global double
+
+define void @foo1() nounwind {
+entry:
+  store i8* getelementptr inbounds ([6 x i8]* @.str, i32 0, i32 0), i8** @gc1, align 4
+  store i8* getelementptr inbounds ([5 x i8]* @.str1, i32 0, i32 0), i8** @gc2, align 4
+  %0 = load double* @gd1, align 8
+  %add = fadd double %0, 2.500000e+00
+  store double %add, double* @gd1, align 8
+  %1 = load double* @gd2, align 8
+  %add1 = fadd double %1, 4.500000e+00
+  store double %add1, double* @gd2, align 8
+  ret void
+}
+