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Disable bignum assembly for certain Arm M-class CPUs

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Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
This commit is contained in:
Dave Rodgman 2023-05-24 12:06:48 +01:00
parent 2b22834357
commit 4489c8dcef
1 changed files with 16 additions and 0 deletions
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16
library/bn_mul.h
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@ -673,6 +673,22 @@
#define MULADDC_CANNOT_USE_R7
#endif
/*
* Similarly, we need to disable the assembly below if:
* - compiler is armclang
* - optimisation is not -O0
* - target is Thumb
* - target cpu is one of cortex-m0, cortex-m0plus, cortex-m1, cortex-m23, sc000
*
* Checking for __ARM_ARCH_6M__ or __ARM_ARCH_8M_BASE__ seems to identify exactly these
* cpus and no others (tested against all values for -mcpu known to armclang 6.20).
*/
#if defined(__ARMCC_VERSION) && defined(__OPTIMIZE__) && defined(__thumb__)
#if defined(__ARM_ARCH_8M_BASE__) || defined(__ARM_ARCH_6M__)
#define MULADDC_CANNOT_USE_R7
#endif
#endif
#if defined(__arm__) && !defined(MULADDC_CANNOT_USE_R7)
#if defined(__thumb__) && !defined(__thumb2__)