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Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
This commit is contained in:
Dave Rodgman 2023-05-25 08:10:33 +01:00
parent 5c5a6dece6
commit 92e8a88390
1 changed files with 8 additions and 6 deletions
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14
library/bn_mul.h
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@ -660,7 +660,7 @@
/*
* There is a fairly complex matrix of supported options for Thumb / Thumb2 / Arm
* assembly. Choosing the correct code path depends on the target, the compiler,
* assembly. Choosing the correct codepath depends on the target, the compiler,
* and the optimisation level.
*
* Note, gcc -O0 by default uses r7 for the frame pointer, so it complains about
@ -672,7 +672,7 @@
*/
#if defined(__thumb__) && !defined(__thumb2__) // Thumb 1 (not Thumb 2) ISA
// Only supported by gcc, when optimisation is enabled; only option A works
// Only supported by gcc, when optimisation is enabled; only Thumb 1 codepath works
#if defined(__OPTIMIZE__) && !defined(__ARMCC_VERSION)
#define ARM_THUMB_1
#endif
@ -680,24 +680,26 @@
#elif defined(__thumb2__) // Thumb 2 ISA
#if !defined(__ARMCC_VERSION) && !defined(__OPTIMIZE__)
// gcc -O0: only option B builds
// gcc -O0: only V6+DSP codepath builds
#if (__ARM_ARCH >= 6) && defined (__ARM_FEATURE_DSP) && (__ARM_FEATURE_DSP == 1)
#define ARM_V6_DSP
#endif
#else
// gcc with optimisation, or armclang: any option builds
// gcc with optimisation, or armclang: any codepath builds
#define ARM_V6_DSP_OR_THUMB_2
#endif
#elif defined(__arm__) // Arm ISA
// any option builds. A does not seem to work; B is about 2x faster than C (under emulation).
// any option builds. Thumb 1 codepath does not seem to work.
#define ARM_V6_DSP_OR_THUMB_2
#endif /* Arm ISA selection */
#if defined(ARM_V6_DSP_OR_THUMB_2)
// Prefer B, if we have the right features for it
// Prefer V6+DSP codepath, if we have the right features for it; otherwise
// fall back to generic Thumb 2 / Arm codepath
// V6+DSP codepath is about 2x faster than Thumb 2 (under emulation).
#if (__ARM_ARCH >= 6) && defined (__ARM_FEATURE_DSP) && (__ARM_FEATURE_DSP == 1)
#define ARM_V6_DSP
#else