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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

llvm-svn: 289744
This commit is contained in:
Joerg Sonnenberger 2016-12-15 00:02:57 +00:00
parent 400e7b7811
commit abedf7a0c0
2 changed files with 12 additions and 1 deletions
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10
clang/lib/Driver/ToolChains.cpp
View File

@ -2879,7 +2879,15 @@ bool Generic_GCC::IsUnwindTablesDefault() const {
}
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; }

3
clang/test/Driver/ppc-abi.c
View File

@ -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"