Add 'volatile' to hardclock()'s asm
Prevents calls from being optimised away in timing_self_test().
(Should no be a problem for calls from other files.)
diff --git a/library/timing.c b/library/timing.c
index c8fa653..9a6129b 100644
--- a/library/timing.c
+++ b/library/timing.c
@@ -83,7 +83,7 @@
unsigned long hardclock( void )
{
unsigned long lo, hi;
- asm( "rdtsc" : "=a" (lo), "=d" (hi) );
+ asm volatile( "rdtsc" : "=a" (lo), "=d" (hi) );
return( lo );
}
#endif
@@ -96,7 +96,7 @@
unsigned long hardclock( void )
{
unsigned long lo, hi;
- asm( "rdtsc" : "=a" (lo), "=d" (hi) );
+ asm volatile( "rdtsc" : "=a" (lo), "=d" (hi) );
return( lo | (hi << 32) );
}
#endif
@@ -112,9 +112,9 @@
do
{
- asm( "mftbu %0" : "=r" (tbu0) );
- asm( "mftb %0" : "=r" (tbl ) );
- asm( "mftbu %0" : "=r" (tbu1) );
+ asm volatile( "mftbu %0" : "=r" (tbu0) );
+ asm volatile( "mftb %0" : "=r" (tbl ) );
+ asm volatile( "mftbu %0" : "=r" (tbu1) );
}
while( tbu0 != tbu1 );
@@ -133,7 +133,7 @@
unsigned long hardclock( void )
{
unsigned long tick;
- asm( "rdpr %%tick, %0;" : "=&r" (tick) );
+ asm volatile( "rdpr %%tick, %0;" : "=&r" (tick) );
return( tick );
}
#endif
@@ -147,8 +147,8 @@
unsigned long hardclock( void )
{
unsigned long tick;
- asm( ".byte 0x83, 0x41, 0x00, 0x00" );
- asm( "mov %%g1, %0" : "=r" (tick) );
+ asm volatile( ".byte 0x83, 0x41, 0x00, 0x00" );
+ asm volatile( "mov %%g1, %0" : "=r" (tick) );
return( tick );
}
#endif
@@ -161,7 +161,7 @@
unsigned long hardclock( void )
{
unsigned long cc;
- asm( "rpcc %0" : "=r" (cc) );
+ asm volatile( "rpcc %0" : "=r" (cc) );
return( cc & 0xFFFFFFFF );
}
#endif
@@ -174,7 +174,7 @@
unsigned long hardclock( void )
{
unsigned long itc;
- asm( "mov %0 = ar.itc" : "=r" (itc) );
+ asm volatile( "mov %0 = ar.itc" : "=r" (itc) );
return( itc );
}
#endif