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Damien George
cd527bb324
This allows it to be used only when the hardware supports VFP instructions, preventing compile errors.
12 lines
244 B
C
12 lines
244 B
C
// an implementation of sqrtf for Thumb using hardware VFP instructions
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#include <math.h>
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float sqrtf(float x) {
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asm volatile (
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"vsqrt.f32 %[r], %[x]\n"
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: [r] "=t" (x)
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: [x] "t" (x));
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return x;
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}
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