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| author | Riku Voipio <riku.voipio@linaro.org> | 2014-01-29 10:54:29 +0200 |
|---|---|---|
| committer | Riku Voipio <riku.voipio@linaro.org> | 2014-02-05 16:35:49 +0200 |
| commit | e8fe990fa06e337a07059c55adc6ed2a0888de95 (patch) | |
| tree | 3efc0ee5c49277dcab4985c0d6cd5e11d520cbdd /src/base/atomicops.h | |
| parent | fa4b1c401da1ac381d4d72172825231b3d5518d9 (diff) | |
| download | gperftools-e8fe990fa06e337a07059c55adc6ed2a0888de95.tar.gz | |
implement atomics with gcc intrinsics
Gcc after 4.7 provides atomic builtins[1]. Use these instead of adding
yet-another-assembly port for Aarch64 (64-bit ARM). This patch enables
succesfully building and running atomicops unittest on Aarch64.
This patch enables using gcc builtins only when no assembly
implementation is provided. But as a quick check, atomicops_unittest
and rest of testsuite passes with atomicops-internals-gcc also
ARMv7 and X86_64 if the ifdef in atomicops is adjusted to prefer
the generic implementation.
[1] http://gcc.gnu.org/onlinedocs/gcc/_005f_005fatomic-Builtins.html
Diffstat (limited to 'src/base/atomicops.h')
| -rw-r--r-- | src/base/atomicops.h | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/src/base/atomicops.h b/src/base/atomicops.h index f3cf1ad..30c819c 100644 --- a/src/base/atomicops.h +++ b/src/base/atomicops.h @@ -98,6 +98,9 @@ // ------------------------------------------------------------------------ #include "base/arm_instruction_set_select.h" +#define GCC_VERSION (__GNUC__ * 10000 \ + + __GNUC_MINOR__ * 100 \ + + __GNUC_PATCHLEVEL__) // TODO(csilvers): match piii, not just __i386. Also, match k8 #if defined(__MACH__) && defined(__APPLE__) @@ -114,12 +117,13 @@ #include "base/atomicops-internals-linuxppc.h" #elif defined(__GNUC__) && defined(__mips__) #include "base/atomicops-internals-mips.h" +#elif defined(__GNUC__) && GCC_VERSION >= 40700 +#include "base/atomicops-internals-gcc.h" #else // Assume x86 for now. If you need to support a new architecture and // don't know how to implement atomic ops, you can probably get away // with using pthreads, since atomicops is only used by spinlock.h/cc -//#error You need to implement atomic operations for this architecture -#include "base/atomicops-internals-x86.h" +#error You need to implement atomic operations for this architecture #endif // Signed type that can hold a pointer and supports the atomic ops below, as |