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Add 'volatile' to hardclock()'s asm

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Prevents calls from being optimised away in timing_self_test().
(Should no be a problem for calls from other files.)
This commit is contained in:
Manuel Pégourié-Gonnard 2014-03-27 21:15:40 +01:00
parent 2be0b5225e
commit d6aebe108a
1 changed files with 10 additions and 10 deletions
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20
library/timing.c
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@ -83,7 +83,7 @@ unsigned long hardclock( void )
unsigned long hardclock( void ) unsigned long hardclock( void )
{ {
unsigned long lo, hi; unsigned long lo, hi;
asm( "rdtsc" : "=a" (lo), "=d" (hi) ); asm volatile( "rdtsc" : "=a" (lo), "=d" (hi) );
return( lo ); return( lo );
} }
#endif #endif
@ -96,7 +96,7 @@ unsigned long hardclock( void )
unsigned long hardclock( void ) unsigned long hardclock( void )
{ {
unsigned long lo, hi; unsigned long lo, hi;
asm( "rdtsc" : "=a" (lo), "=d" (hi) ); asm volatile( "rdtsc" : "=a" (lo), "=d" (hi) );
return( lo | (hi << 32) ); return( lo | (hi << 32) );
} }
#endif #endif
@ -112,9 +112,9 @@ unsigned long hardclock( void )
do do
{ {
asm( "mftbu %0" : "=r" (tbu0) ); asm volatile( "mftbu %0" : "=r" (tbu0) );
asm( "mftb %0" : "=r" (tbl ) ); asm volatile( "mftb %0" : "=r" (tbl ) );
asm( "mftbu %0" : "=r" (tbu1) ); asm volatile( "mftbu %0" : "=r" (tbu1) );
} }
while( tbu0 != tbu1 ); while( tbu0 != tbu1 );
@ -133,7 +133,7 @@ unsigned long hardclock( void )
unsigned long hardclock( void ) unsigned long hardclock( void )
{ {
unsigned long tick; unsigned long tick;
asm( "rdpr %%tick, %0;" : "=&r" (tick) ); asm volatile( "rdpr %%tick, %0;" : "=&r" (tick) );
return( tick ); return( tick );
} }
#endif #endif
@ -147,8 +147,8 @@ unsigned long hardclock( void )
unsigned long hardclock( void ) unsigned long hardclock( void )
{ {
unsigned long tick; unsigned long tick;
asm( ".byte 0x83, 0x41, 0x00, 0x00" ); asm volatile( ".byte 0x83, 0x41, 0x00, 0x00" );
asm( "mov %%g1, %0" : "=r" (tick) ); asm volatile( "mov %%g1, %0" : "=r" (tick) );
return( tick ); return( tick );
} }
#endif #endif
@ -161,7 +161,7 @@ unsigned long hardclock( void )
unsigned long hardclock( void ) unsigned long hardclock( void )
{ {
unsigned long cc; unsigned long cc;
asm( "rpcc %0" : "=r" (cc) ); asm volatile( "rpcc %0" : "=r" (cc) );
return( cc & 0xFFFFFFFF ); return( cc & 0xFFFFFFFF );
} }
#endif #endif
@ -174,7 +174,7 @@ unsigned long hardclock( void )
unsigned long hardclock( void ) unsigned long hardclock( void )
{ {
unsigned long itc; unsigned long itc;
asm( "mov %0 = ar.itc" : "=r" (itc) ); asm volatile( "mov %0 = ar.itc" : "=r" (itc) );
return( itc ); return( itc );
} }
#endif #endif