Initial TOC support for PowerPC64 object creation
This patch adds initial PPC64 TOC MC object creation using the small mcmodel
(a single 64K TOC) adding the some TOC relocations (R_PPC64_TOC,
R_PPC64_TOC16, and R_PPC64_TOC16DS).
The addition of 'undefinedExplicitRelSym' hook on 'MCELFObjectTargetWriter'
is meant to avoid the creation of an unreferenced ".TOC." symbol (used in
the .odp creation) as well to set the R_PPC64_TOC relocation target as the
temporary ".TOC." symbol. On PPC64 ABI, the R_PPC64_TOC relocation should
not point to any symbol.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166677 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/PowerPC/PPCSubtarget.cpp b/lib/Target/PowerPC/PPCSubtarget.cpp
index 14b8534..9c8cb92 100644
--- a/lib/Target/PowerPC/PPCSubtarget.cpp
+++ b/lib/Target/PowerPC/PPCSubtarget.cpp
@@ -54,19 +54,26 @@
CPUName = sys::getHostCPUName();
#endif
- // Parse features string.
- ParseSubtargetFeatures(CPUName, FS);
-
// Initialize scheduling itinerary for the specified CPU.
InstrItins = getInstrItineraryForCPU(CPUName);
+ // Make sure 64-bit features are available when CPUname is generic
+ std::string FullFS = FS;
+
// If we are generating code for ppc64, verify that options make sense.
if (is64Bit) {
Has64BitSupport = true;
// Silently force 64-bit register use on ppc64.
Use64BitRegs = true;
+ if (!FullFS.empty())
+ FullFS = "+64bit," + FullFS;
+ else
+ FullFS = "+64bit";
}
+ // Parse features string.
+ ParseSubtargetFeatures(CPUName, FullFS);
+
// If the user requested use of 64-bit regs, but the cpu selected doesn't
// support it, ignore.
if (use64BitRegs() && !has64BitSupport())