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| author | Thiago Macieira <thiago.macieira@nokia.com> | 2010-09-08 11:20:47 (GMT) |
|---|---|---|
| committer | Thiago Macieira <thiago.macieira@nokia.com> | 2010-09-08 17:32:10 (GMT) |
| commit | 4c0e59e6ad6b697a28f7c57540fb2eb0042d04d0 (patch) | |
| tree | ad7f652e5f9c6fa3a27b00b402f3aebadeb54ea3 /src/corelib/tools/qsimd.cpp | |
| parent | 13192187f96554277ffdae40f5117682041b3556 (diff) | |
| download | Qt-4c0e59e6ad6b697a28f7c57540fb2eb0042d04d0.zip Qt-4c0e59e6ad6b697a28f7c57540fb2eb0042d04d0.tar.gz Qt-4c0e59e6ad6b697a28f7c57540fb2eb0042d04d0.tar.bz2 | |
Work around a compiler bug on 64-bit.
Some GCC versions seem to think that the EBX register is the PIC
register even on 64-bit. So instead of telling GCC that we clobbered
it, save it instead on a temporary register.
Reviewed-by: Trust Me
Diffstat (limited to 'src/corelib/tools/qsimd.cpp')
| -rw-r--r-- | src/corelib/tools/qsimd.cpp | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/src/corelib/tools/qsimd.cpp b/src/corelib/tools/qsimd.cpp index a9c33f1..7babf3a 100644 --- a/src/corelib/tools/qsimd.cpp +++ b/src/corelib/tools/qsimd.cpp @@ -286,10 +286,13 @@ static inline uint detectProcessorFeatures() uint feature_result = 0; #if defined(Q_CC_GNU) - asm ("cpuid" - : "=c" (feature_result) + long tmp; + asm ("xchg %%rbx, %1\n" + "cpuid\n" + "xchg %%rbx, %1\n" + : "=c" (feature_result), "=&r" (tmp) : "a" (1) - : "%ebx", "%edx" + : "%edx" ); #elif defined (Q_OS_WIN64) { |