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test: add 'volatile' to rdtsc() and friends (fix for modern clang).

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Change-Id: I82d531f66b1aa44c173485d1955611ed46767998
This commit is contained in:
Leo Yuriev 2017-07-03 05:11:52 +03:00
parent 229514c93e
commit 283eb0aff0
1 changed files with 13 additions and 9 deletions
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22
test/utils.cc
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@ -110,35 +110,35 @@ uint64_t entropy_ticks(void) {
#if defined(__GNUC__) || defined(__clang__) #if defined(__GNUC__) || defined(__clang__)
#if defined(__ia64__) #if defined(__ia64__)
uint64_t ticks; uint64_t ticks;
__asm("mov %0=ar.itc" : "=r"(ticks)); __asm __volatile("mov %0=ar.itc" : "=r"(ticks));
return ticks; return ticks;
#elif defined(__hppa__) #elif defined(__hppa__)
uint64_t ticks; uint64_t ticks;
__asm("mfctl 16, %0" : "=r"(ticks)); __asm __volatile("mfctl 16, %0" : "=r"(ticks));
return ticks; return ticks;
#elif defined(__s390__) #elif defined(__s390__)
uint64_t ticks; uint64_t ticks;
__asm("stck 0(%0)" : : "a"(&(ticks)) : "memory", "cc"); __asm __volatile("stck 0(%0)" : : "a"(&(ticks)) : "memory", "cc");
return ticks; return ticks;
#elif defined(__alpha__) #elif defined(__alpha__)
uint64_t ticks; uint64_t ticks;
__asm("rpcc %0" : "=r"(ticks)); __asm __volatile("rpcc %0" : "=r"(ticks));
return ticks; return ticks;
#elif defined(__sparc_v9__) #elif defined(__sparc_v9__)
uint64_t ticks; uint64_t ticks;
__asm("rd %%tick, %0" : "=r"(ticks)); __asm __volatile("rd %%tick, %0" : "=r"(ticks));
return ticks; return ticks;
#elif defined(__powerpc64__) || defined(__ppc64__) #elif defined(__powerpc64__) || defined(__ppc64__)
uint64_t ticks; uint64_t ticks;
__asm("mfspr %0, 268" : "=r"(ticks)); __asm __volatile("mfspr %0, 268" : "=r"(ticks));
return ticks; return ticks;
#elif defined(__ppc__) || defined(__powerpc__) #elif defined(__ppc__) || defined(__powerpc__)
unsigned tbl, tbu; unsigned tbl, tbu;
/* LY: Here not a problem if a high-part (tbu) /* LY: Here not a problem if a high-part (tbu)
* would been updated during reading. */ * would been updated during reading. */
__asm("mftb %0" : "=r"(tbl)); __asm __volatile("mftb %0" : "=r"(tbl));
__asm("mftbu %0" : "=r"(tbu)); __asm __volatile("mftbu %0" : "=r"(tbu));
return (((uin64_t)tbu0) << 32) | tbl; return (((uin64_t)tbu0) << 32) | tbl;
#elif defined(__mips__) #elif defined(__mips__)
@ -153,12 +153,16 @@ uint64_t entropy_ticks(void) {
return *mips_tsc_addr; return *mips_tsc_addr;
} }
#elif defined(__x86_64__) || defined(__i386__) #elif defined(__x86_64__) || defined(__i386__)
#if __GNUC_PREREQ(4, 7) || __has_builtin(__builtin_ia32_rdtsc)
return __builtin_ia32_rdtsc();
#else
unsigned lo, hi; unsigned lo, hi;
/* LY: Using the "a" and "d" constraints is important for correct code. */ /* LY: Using the "a" and "d" constraints is important for correct code. */
__asm("rdtsc" : "=a"(lo), "=d"(hi)); __asm __volatile("rdtsc" : "=a"(lo), "=d"(hi));
return (((uint64_t)hi) << 32) + lo; return (((uint64_t)hi) << 32) + lo;
#endif
#endif /* arch selector */ #endif /* arch selector */
#elif defined(_M_IX86) || defined(_M_X64) #elif defined(_M_IX86) || defined(_M_X64)