| Fixes Thumb2-related build failure |
| |
| Patch below comes from the Debian libmad package. |
| |
| Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> |
| |
| From: Dave Martin |
| Subject: "rsc" doesnt exist anymore in thumb2 |
| |
| diff --git a/fixed.h b/fixed.h |
| index 4b58abf..ba4bc26 100644 |
| --- a/fixed.h |
| +++ b/fixed.h |
| @@ -275,12 +275,25 @@ mad_fixed_t mad_f_mul_inline(mad_fixed_t x, mad_fixed_t y) |
| : "+r" (lo), "+r" (hi) \ |
| : "%r" (x), "r" (y)) |
| |
| +#ifdef __thumb__ |
| +/* In Thumb-2, the RSB-immediate instruction is only allowed with a zero |
| + operand. If needed this code can also support Thumb-1 |
| + (simply append "s" to the end of the second two instructions). */ |
| +# define MAD_F_MLN(hi, lo) \ |
| + asm ("rsbs %0, %0, #0\n\t" \ |
| + "sbc %1, %1, %1\n\t" \ |
| + "sub %1, %1, %2" \ |
| + : "+&r" (lo), "=&r" (hi) \ |
| + : "r" (hi) \ |
| + : "cc") |
| +#else /* ! __thumb__ */ |
| # define MAD_F_MLN(hi, lo) \ |
| asm ("rsbs %0, %2, #0\n\t" \ |
| "rsc %1, %3, #0" \ |
| - : "=r" (lo), "=r" (hi) \ |
| + : "=&r" (lo), "=r" (hi) \ |
| : "0" (lo), "1" (hi) \ |
| : "cc") |
| +#endif /* __thumb__ */ |
| |
| # define mad_f_scale64(hi, lo) \ |
| ({ mad_fixed_t __result; \ |
