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Add unvectorized fallback in case FP exceptions are not masked

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If an application enables FP exceptions our FP-based unpremul will
raise the INVALID exception. Since disabling them locally might be slow
just take a slow path when detected.

Fixes: QTBUG-75592
Change-Id: Ie22a032a4f62229f68ad21ede359c62291adc9bf
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
This commit is contained in:
Allan Sandfeld Jensen 2019-05-06 12:35:05 +02:00
parent 2a1651cc16
commit 4d2ee7f358
1 changed files with 18 additions and 0 deletions
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18
src/gui/painting/qdrawhelper_sse4.cpp
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@ -107,6 +107,17 @@ template<bool RGBA, bool RGBx>
static inline void convertARGBFromARGB32PM_sse4(uint *buffer, const uint *src, int count)
{
int i = 0;
if ((_MM_GET_EXCEPTION_MASK() & _MM_MASK_INVALID) == 0) {
for (; i < count; ++i) {
uint v = qUnpremultiply(src[i]);
if (RGBx)
v = 0xff000000 | v;
if (RGBA)
v = ARGB2RGBA(v);
buffer[i] = v;
}
return;
}
const __m128i alphaMask = _mm_set1_epi32(0xff000000);
const __m128i rgbaMask = _mm_setr_epi8(2, 1, 0, 3, 6, 5, 4, 7, 10, 9, 8, 11, 14, 13, 12, 15);
const __m128i zero = _mm_setzero_si128();
@ -174,6 +185,13 @@ template<bool RGBA>
static inline void convertARGBFromRGBA64PM_sse4(uint *buffer, const QRgba64 *src, int count)
{
int i = 0;
if ((_MM_GET_EXCEPTION_MASK() & _MM_MASK_INVALID) == 0) {
for (; i < count; ++i) {
const QRgba64 v = src[i].unpremultiplied();
buffer[i] = RGBA ? toRgba8888(v) : toArgb32(v);
}
return;
}
const __m128i alphaMask = _mm_set1_epi64x(qint64(Q_UINT64_C(0xffff) << 48));
const __m128i alphaMask32 = _mm_set1_epi32(0xff000000);
const __m128i rgbaMask = _mm_setr_epi8(2, 1, 0, 3, 6, 5, 4, 7, 10, 9, 8, 11, 14, 13, 12, 15);