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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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12
library/bn_mul.h
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@ -672,7 +672,7 @@
*/ */
#if defined(__thumb__) && !defined(__thumb2__) // Thumb 1 (not Thumb 2) ISA #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) #if defined(__OPTIMIZE__) && !defined(__ARMCC_VERSION)
#define ARM_THUMB_1 #define ARM_THUMB_1
#endif #endif
@ -680,24 +680,26 @@
#elif defined(__thumb2__) // Thumb 2 ISA #elif defined(__thumb2__) // Thumb 2 ISA
#if !defined(__ARMCC_VERSION) && !defined(__OPTIMIZE__) #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) #if (__ARM_ARCH >= 6) && defined (__ARM_FEATURE_DSP) && (__ARM_FEATURE_DSP == 1)
#define ARM_V6_DSP #define ARM_V6_DSP
#endif #endif
#else #else
// gcc with optimisation, or armclang: any option builds // gcc with optimisation, or armclang: any codepath builds
#define ARM_V6_DSP_OR_THUMB_2 #define ARM_V6_DSP_OR_THUMB_2
#endif #endif
#elif defined(__arm__) // Arm ISA #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 #define ARM_V6_DSP_OR_THUMB_2
#endif /* Arm ISA selection */ #endif /* Arm ISA selection */
#if defined(ARM_V6_DSP_OR_THUMB_2) #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) #if (__ARM_ARCH >= 6) && defined (__ARM_FEATURE_DSP) && (__ARM_FEATURE_DSP == 1)
#define ARM_V6_DSP #define ARM_V6_DSP
#else #else