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Switch to vector shifts instead of vector merge

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Jeffrey Walton 2018-08-10 04:27:49 -04:00
parent a2a520e5b9
commit 1c224c8798
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GPG Key ID: B36AB348921B1838
1 changed files with 4 additions and 4 deletions
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8
gcm-simd.cpp
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@ -760,16 +760,16 @@ void GCM_Xor16_ALTIVEC(byte *a, const byte *b, const byte *c)
uint64x2_p GCM_Reduce_VMULL(uint64x2_p c0, uint64x2_p c1, uint64x2_p c2, uint64x2_p r)
{
const uint64x2_p z = {0}, m1 = {1,1}, m63 = {63,63};
const uint64x2_p m1 = {1,1}, m63 = {63,63};
c1 = VectorXor(c1, vec_mergeh(z, c0));
c1 = VectorXor(c1, VectorShiftRight<8>(c0));
c1 = VectorXor(c1, VMULL_10(c0, r));
c0 = vec_mergel(c0, z);
c0 = VectorShiftLeft<8>(c0);
c0 = VectorXor(c0, c1);
c0 = vec_sl(c0, m1);
c0 = VMULL_00(c0, r);
c2 = VectorXor(c2, c0);
c2 = VectorXor(c2, vec_mergel(c1, z));
c2 = VectorXor(c2, VectorShiftLeft<8>(c1));
c1 = vec_sr(vec_mergeh(c1, c2), m63);
c2 = vec_sl(c2, m1);