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[MIPS] Fix instable BogoMIPS on multi-issue processors. 

Increase alignment of BogoMIPS loop to 8 bytes.  Having the delay loop
overlap cache line boundaries may cause instable delays.
    
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
hifive-unleashed-5.1
Ralf Baechle 2006-05-23 16:37:32 +01:00
parent f3bf07b9a3
commit 5ee823507b
1 changed files with 12 additions and 10 deletions
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22
include/asm-mips/delay.h
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@ -19,20 +19,22 @@ static inline void __delay(unsigned long loops)
{
if (sizeof(long) == 4)
__asm__ __volatile__ (
".set\tnoreorder\n"
"1:\tbnez\t%0,1b\n\t"
"subu\t%0,1\n\t"
".set\treorder"
" .set noreorder \n"
" .align 3 \n"
"1: bnez %0, 1b \n"
" subu %0, 1 \n"
" .set reorder \n"
: "=r" (loops)
: "0" (loops));
else if (sizeof(long) == 8)
__asm__ __volatile__ (
".set\tnoreorder\n"
"1:\tbnez\t%0,1b\n\t"
"dsubu\t%0,1\n\t"
".set\treorder"
:"=r" (loops)
:"0" (loops));
" .set noreorder \n"
" .align 3 \n"
"1: bnez %0, 1b \n"
" dsubu %0, 1 \n"
" .set reorder \n"
: "=r" (loops)
: "0" (loops));
}