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fix optimized build with -mcmodel=medium

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INFO: From Compiling src/dsp/cpu.c:
src/dsp/cpu.c: In function 'x86CPUInfo':
src/dsp/cpu.c:36:3: inconsistent operand constraints in an 'asm'

With PIC and mcmodel=medium, the %rbx register must be saved and
restored which causes this problem.  This was also solved in GCC-4.9 with
this patch:
https://gcc.gnu.org/ml/gcc-patches/2012-12/msg01484.html

Tested:
Builds fine with this change.

Change-Id: Icca8eea7bf5af3ef9f17f6ae2886e3430143febf
This commit is contained in:
Sriraman Tallam 2015-09-04 03:23:05 +00:00 committed by James Zern
parent 038a060dfc
commit b275e598b5
1 changed files with 12 additions and 0 deletions
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12
src/dsp/cpu.c
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@ -31,6 +31,18 @@ static WEBP_INLINE void GetCPUInfo(int cpu_info[4], int info_type) {
: "=a"(cpu_info[0]), "=D"(cpu_info[1]), "=c"(cpu_info[2]), "=d"(cpu_info[3])
: "a"(info_type), "c"(0));
}
#elif defined(__x86_64__) && \
(defined(__code_model_medium__) || defined(__code_model_large__)) && \
defined(__PIC__)
static WEBP_INLINE void GetCPUInfo(int cpu_info[4], int info_type) {
__asm__ volatile (
"xchg{q}\t{%%rbx}, %q1\n"
"cpuid\n"
"xchg{q}\t{%%rbx}, %q1\n"
: "=a"(cpu_info[0]), "=&r"(cpu_info[1]), "=c"(cpu_info[2]),
"=d"(cpu_info[3])
: "a"(info_type), "c"(0));
}
#elif defined(__i386__) || defined(__x86_64__)
static WEBP_INLINE void GetCPUInfo(int cpu_info[4], int info_type) {
__asm__ volatile (