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Simplify ifdefs

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Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
This commit is contained in:
Dave Rodgman 2023-05-25 12:53:41 +01:00
parent b047bf64e2
commit 12b14b2c97
1 changed files with 15 additions and 38 deletions
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53
library/bn_mul.h
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@ -658,42 +658,14 @@
#endif /* TriCore */
#if defined(__arm__)
#if defined(__thumb__) && !defined(__thumb2__) && !defined(__ARMCC_VERSION)
/*
* There is a fairly complex matrix of supported options for Thumb / Thumb2 / Arm
* assembly. Choosing the correct codepath depends on the target, the compiler,
* and the optimisation level.
* Thumb 1 ISA. This code path does not work on armclang.
*/
#if defined(__thumb__) && !defined(__thumb2__) // Thumb 1 (not Thumb 2) ISA
// Only supported by gcc, when optimisation is enabled; only Thumb 1 codepath works
#define ARM_THUMB_1
#elif defined(__thumb2__) // Thumb 2 ISA
// Any codepath builds.
#define ARM_V6_DSP_OR_THUMB_2
#elif defined(__arm__) // Arm ISA
// 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 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
#define ARM_THUMB_2
#endif
#endif /* defined(ARM_V6_DSP_OR_THUMB_2) */
#if defined(ARM_THUMB_1)
#if defined(__OPTIMIZE__) && defined(__GNUC__)
#if !defined(__OPTIMIZE__) && defined(__GNUC__)
/*
* Note, gcc -O0 by default uses r7 for the frame pointer, so it complains about
* our use of r7 below, unless -fomit-frame-pointer is passed.
@ -710,12 +682,12 @@
#define MULADDC_PRESERVE_R1 "mov r10, r1 \n\t"
#define MULADDC_RESTORE_R1 "mov r1, r10 \n\t"
#define MULADDC_SCRATCH_CLOBBER "r10"
#else
#else /* !defined(__OPTIMIZE__) && defined(__GNUC__) */
#define MULADDC_SCRATCH "RS .req r7 \n\t"
#define MULADDC_PRESERVE_R1 ""
#define MULADDC_RESTORE_R1 ""
#define MULADDC_SCRATCH_CLOBBER "r7"
#endif
#endif /* !defined(__OPTIMIZE__) && defined(__GNUC__) */
#define MULADDC_X1_INIT \
asm( \
@ -774,7 +746,9 @@
"r6", MULADDC_SCRATCH_CLOBBER, "r8", "r9", "cc" \
);
#elif defined(ARM_V6_DSP)
#elif (__ARM_ARCH >= 6) && \
defined (__ARM_FEATURE_DSP) && (__ARM_FEATURE_DSP == 1)
/* Armv6-M with DSP Instruction Set Extensions */
#define MULADDC_X1_INIT \
{ \
@ -839,7 +813,8 @@
); \
}
#elif defined(ARM_THUMB_2)
#elif defined(__thumb2__) || !defined(__thumb__)
/* Thumb 2 or Arm ISA, without DSP extensions */
#define MULADDC_X1_INIT \
asm( \
@ -867,7 +842,9 @@
"r6", "cc" \
);
#endif /* Arm */
#endif /* ISA codepath selection */
#endif /* defined(__arm__) */
#if defined(__alpha__)