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libmusepack: add ARMv7-M version of MPC_MULTIPLY_EX

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We can't use Operand2 with register based shifts on ARMv7-M as it
isn't supported in the Thumb encoding. Instead, perform the shift
separately.

Change-Id: Ie96aa0a565e98bbca724dffc2ffc6d64fdb5d7c3
This commit is contained in:
Aidan MacDonald 2025-01-16 11:58:54 +00:00
parent c249dea2b7
commit 94c7c908b3
1 changed files with 18 additions and 1 deletions
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19
lib/rbcodec/codecs/libmusepack/mpcdec_math.h
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@ -128,7 +128,23 @@
: [x]"r"(X), [y]"r"(Y)); \
lo; \
})
#if defined (CPU_ARM_MICRO)
/* Calculate: result = (X*Y)>>Z */
#define MPC_MULTIPLY_EX(X,Y,Z) \
({ \
MPC_SAMPLE_FORMAT lo; \
MPC_SAMPLE_FORMAT hi; \
asm volatile ( \
"smull %[lo], %[hi], %[x], %[y] \n\t" /* multiply */ \
"mov %[lo], %[lo], lsr %[shr] \n\t" /* lo >>= Z */ \
"lsl %[hi], %[hi], %[shl] \n\t" /* hi <<= 32 - Z */ \
"orr %[lo], %[lo], %[hi] \n\t" /* lo |= hi */ \
: [lo]"=&r"(lo), [hi]"=&r"(hi) \
: [x]"r"(X), [y]"r"(Y), [shr]"r"(Z), [shl]"r"(32-Z)); \
lo; \
})
#else
/* Calculate: result = (X*Y)>>Z */
#define MPC_MULTIPLY_EX(X,Y,Z) \
({ \
@ -142,6 +158,7 @@
: [x]"r"(X), [y]"r"(Y), [shr]"r"(Z), [shl]"r"(32-Z)); \
lo; \
})
#endif
#else /* libmusepack standard */
#define MPC_MULTIPLY_NOTRUNCATE(X,Y) \