Blame SOURCES/Provide-Thumb-2-alternative-code-for-MAD_F_MLN.diff
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From: Dave Martin
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Subject: "rsc" doesnt exist anymore in thumb2
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diff --git a/fixed.h b/fixed.h
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index 4b58abf..ba4bc26 100644
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--- a/fixed.h
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+++ b/fixed.h
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@@ -275,12 +275,25 @@ mad_fixed_t mad_f_mul_inline(mad_fixed_t x, mad_fixed_t y)
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: "+r" (lo), "+r" (hi) \
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: "%r" (x), "r" (y))
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+#ifdef __thumb__
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+/* In Thumb-2, the RSB-immediate instruction is only allowed with a zero
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+ operand. If needed this code can also support Thumb-1
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+ (simply append "s" to the end of the second two instructions). */
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+# define MAD_F_MLN(hi, lo) \
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+ asm ("rsbs %0, %0, #0\n\t" \
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+ "sbc %1, %1, %1\n\t" \
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+ "sub %1, %1, %2" \
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+ : "+&r" (lo), "=&r" (hi) \
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+ : "r" (hi) \
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+ : "cc")
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+#else /* ! __thumb__ */
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# define MAD_F_MLN(hi, lo) \
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asm ("rsbs %0, %2, #0\n\t" \
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"rsc %1, %3, #0" \
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- : "=r" (lo), "=r" (hi) \
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+ : "=&r" (lo), "=r" (hi) \
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: "0" (lo), "1" (hi) \
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: "cc")
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+#endif /* __thumb__ */
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# define mad_f_scale64(hi, lo) \
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({ mad_fixed_t __result; \
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