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dec_neon: add ConvertU8ToS16

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Change-Id: Ifc4fb8e7f862e72154d2f2739811b1022d2b9416
This commit is contained in:
James Zern 2014-02-20 15:35:33 -08:00
parent 77a8f91981
commit 2ff0aae2fe
1 changed files with 9 additions and 8 deletions
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17
src/dsp/dec_neon.c
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@ -89,6 +89,11 @@
"vst2.8 {" #c1"[6], " #c2"[6]}," #p "," #stride " \n" \
"vst2.8 {" #c1"[7], " #c2"[7]}," #p "," #stride " \n"
// Treats 'v' as an uint8x8_t and zero extends to an int16x8_t.
static WEBP_INLINE int16x8_t ConvertU8ToS16(uint32x2_t v) {
return vreinterpretq_s16_u16(vmovl_u8(vreinterpret_u8_u32(v)));
}
// Performs unsigned 8b saturation on 'dst01' and 'dst23' storing the result
// to the corresponding rows of 'dst'.
static WEBP_INLINE void SaturateAndStore4x4(uint8_t* const dst,
@ -342,10 +347,8 @@ static void TransformDC(const int16_t* in, uint8_t* dst) {
{
// Convert to 16b.
int16x8_t dst01_s16 =
vreinterpretq_s16_u16(vmovl_u8(vreinterpret_u8_u32(dst01)));
int16x8_t dst23_s16 =
vreinterpretq_s16_u16(vmovl_u8(vreinterpret_u8_u32(dst23)));
int16x8_t dst01_s16 = ConvertU8ToS16(dst01);
int16x8_t dst23_s16 = ConvertU8ToS16(dst23);
// Add the inverse transform.
dst01_s16 = vaddq_s16(dst01_s16, DC);
@ -448,10 +451,8 @@ static void TransformAC3(const int16_t* in, uint8_t* dst) {
{
// Convert to 16b.
int16x8_t dst01_s16 =
vreinterpretq_s16_u16(vmovl_u8(vreinterpret_u8_u32(dst01)));
int16x8_t dst23_s16 =
vreinterpretq_s16_u16(vmovl_u8(vreinterpret_u8_u32(dst23)));
int16x8_t dst01_s16 = ConvertU8ToS16(dst01);
int16x8_t dst23_s16 = ConvertU8ToS16(dst23);
// Add the inverse transform.
dst01_s16 = vsraq_n_s16(dst01_s16, m0_m1, 3);