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libspc: Temporarily disable problematic armv4 asm optimization

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asm volatile (
    "mov    %[t0], %[out], asr #11  \n"
    "mul    %[out], %[t0], %[envx]  \n"
    : [out]"+r"(output), [t0]"=&r"(t0)
    : [envx]"r"((int) voice->envx));

This is resulting in "Rd and Rm should be different in mul" error,
because the compiler is putting [out] and [t0] into the same
register.

After some poking there doesn't appear to be a sane way to change
the constraints, so just disable it for now.

Change-Id: I7827713c8aadb27f0bf4a6f4a3e1d910c6193686
This commit is contained in:
Solomon Peachy 2025-09-21 15:33:55 -04:00
parent bb251ba603
commit caaea275eb
1 changed files with 3 additions and 1 deletions
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2
lib/rbcodec/codecs/libspc/cpu/spc_dsp_armv4.c
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@ -50,6 +50,7 @@ static inline int gaussian_fast_interp( int16_t const* samples,
return output;
}
#if 0 // first asm block generates "Rd and Rm should be different in mul" error
#define SPC_GAUSSIAN_FAST_AMP
static inline int gaussian_fast_amp( struct voice_t* voice, int output,
int* amp_0, int* amp_1 )
@ -73,6 +74,7 @@ static inline int gaussian_fast_amp( struct voice_t* voice, int output,
return output;
}
#endif
#define SPC_GAUSSIAN_SLOW_INTERP
static inline int gaussian_slow_interp( int16_t const* samples,