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timer: Fix type punning strict aliasing warning

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Fixes the warning from gcc in Qsqrt(). Verified that the generated assembly
code is the same as the original.
This commit is contained in:
Chris
2022-09-18 03:58:34 -04:00
parent c2ac620686
commit 23b2bb4660
1 changed files with 11 additions and 9 deletions
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20
cores/arduino/libcore/timer.c
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@@ -77,17 +77,19 @@ void Timer_ClockCmd(tmr_type* TIMx, bool Enable)
static float Qsqrt(float number)
{
long i;
float x2, y;
union {
long i;
float y;
} cast;
float x2;
const float threehalfs = 1.5f;
x2 = number * 0.5f;
y = number;
i = *(long*)&y;
i = 0x5f3759df - (i >> 1);
y = *(float*)&i;
y = y * (threehalfs - (x2 * y * y));
y = y * (threehalfs - (x2 * y * y));
return 1.0f / y;
cast.y = number;
cast.i = 0x5f3759df - (cast.i >> 1);
cast.y = cast.y * (threehalfs - (x2 * cast.y * cast.y));
cast.y = cast.y * (threehalfs - (x2 * cast.y * cast.y));
return 1.0f / cast.y;
}
/**