Author: joerg Date: Wed Dec 14 18:02:57 2016 New Revision: 289744 URL: http://llvm.org/viewvc/llvm-project?rev=289744&view=rev Log: Use PIC relocation mode by default for PowerPC64 ELF
Most of the PowerPC64 code generation already creates PIC access. This changes to a full PIC default, similar to what GCC is doing. Overall, a monolithic clang binary shrinks by 600KB (about 1%). This can be a slight regression for TLS access and will use the TOC more aggressively instead of synthesizing immediates. It is expected to be performance neutral. Differential Revision: https://reviews.llvm.org/D26564 Modified: cfe/trunk/lib/Driver/ToolChains.cpp cfe/trunk/test/Driver/ppc-abi.c Modified: cfe/trunk/lib/Driver/ToolChains.cpp URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Driver/ToolChains.cpp?rev=289744&r1=289743&r2=289744&view=diff ============================================================================== --- cfe/trunk/lib/Driver/ToolChains.cpp (original) +++ cfe/trunk/lib/Driver/ToolChains.cpp Wed Dec 14 18:02:57 2016 @@ -2879,7 +2879,15 @@ bool Generic_GCC::IsUnwindTablesDefault( } bool Generic_GCC::isPICDefault() const { - return getArch() == llvm::Triple::x86_64 && getTriple().isOSWindows(); + switch (getArch()) { + case llvm::Triple::x86_64: + return getTriple().isOSWindows(); + case llvm::Triple::ppc64: + case llvm::Triple::ppc64le: + return !getTriple().isOSBinFormatMachO() && !getTriple().isMacOSX(); + default: + return false; + } } bool Generic_GCC::isPIEDefault() const { return false; } Modified: cfe/trunk/test/Driver/ppc-abi.c URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/Driver/ppc-abi.c?rev=289744&r1=289743&r2=289744&view=diff ============================================================================== --- cfe/trunk/test/Driver/ppc-abi.c (original) +++ cfe/trunk/test/Driver/ppc-abi.c Wed Dec 14 18:02:57 2016 @@ -24,7 +24,10 @@ // RUN: %clang -target powerpc64le-unknown-linux-gnu %s -### -o %t.o 2>&1 \ // RUN: -mabi=altivec | FileCheck -check-prefix=CHECK-ELFv2 %s +// CHECK-ELFv1: "-mrelocation-model" "pic" "-pic-level" "2" // CHECK-ELFv1: "-target-abi" "elfv1" +// CHECK-ELFv1-QPX: "-mrelocation-model" "pic" "-pic-level" "2" // CHECK-ELFv1-QPX: "-target-abi" "elfv1-qpx" +// CHECK-ELFv2: "-mrelocation-model" "pic" "-pic-level" "2" // CHECK-ELFv2: "-target-abi" "elfv2" _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org http://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
