lib/libm: Move Thumb-specific sqrtf function to separate file.

This allows it to be used only when the hardware supports VFP
instructions, preventing compile errors.
crypto-aes
Damien George 6 years ago
parent 828df54bfe
commit cd527bb324
  1. 13
      lib/libm/math.c
  2. 11
      lib/libm/thumb_vfp_sqrtf.c
  3. 1
      stmhal/Makefile

@ -86,19 +86,6 @@ double __aeabi_dmul(double x , double y) {
#endif // defined(__thumb__)
// TODO this needs a better way of testing for Thumb2 FP hardware
#if defined(__thumb2__)
float sqrtf(float x) {
asm volatile (
"vsqrt.f32 %[r], %[x]\n"
: [r] "=t" (x)
: [x] "t" (x));
return x;
}
#endif
#ifndef NDEBUG
float copysignf(float x, float y) {
float_s_t fx={.f = x};

@ -0,0 +1,11 @@
// an implementation of sqrtf for Thumb using hardware VFP instructions
#include <math.h>
float sqrtf(float x) {
asm volatile (
"vsqrt.f32 %[r], %[x]\n"
: [r] "=t" (x)
: [x] "t" (x));
return x;
}

@ -81,6 +81,7 @@ endif
SRC_LIB = $(addprefix lib/,\
libc/string0.c \
libm/math.c \
libm/thumb_vfp_sqrtf.c \
libm/asinfacosf.c \
libm/atanf.c \
libm/atan2f.c \

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