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SubjectRe: [PATCH V2 2/5] powerpc, perf: Add basic assembly code to read BHRB entries on POWER8
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> +/* r3 = n  (where n = [0-1023])
> + * The maximum number of BHRB entries supported with PPC_MFBHRBE
> instruction
> + * is 1024. We have limited number of table entries here as POWER8
> implements
> + * 32 BHRB entries.
> + */
> +
> +/* .global read_bhrb */
> +_GLOBAL(read_bhrb)
> + cmpldi r3,1023

This should be 31, since that is the last entry in the table below.

> + bgt 1f
> + ld r4,bhrb_table@got(r2)
> + sldi r3,r3,3
> + add r3,r4,r3
> + mtctr r3
> + bctr
> +1: li r3,0
> + blr
> +
> +#define MFBHRB_TABLE1(n) PPC_MFBHRBE(R3,n); blr
> +#define MFBHRB_TABLE2(n) MFBHRB_TABLE1(n); MFBHRB_TABLE1(n+1)
> +#define MFBHRB_TABLE4(n) MFBHRB_TABLE2(n); MFBHRB_TABLE2(n+2)
> +#define MFBHRB_TABLE8(n) MFBHRB_TABLE4(n); MFBHRB_TABLE4(n+4)
> +#define MFBHRB_TABLE16(n) MFBHRB_TABLE8(n); MFBHRB_TABLE8(n+8)
> +#define MFBHRB_TABLE32(n) MFBHRB_TABLE16(n); MFBHRB_TABLE16(n+16)
> +
> +bhrb_table:
> + MFBHRB_TABLE32(0)


Segher



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