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authorArd Biesheuvel <ard.biesheuvel@linaro.org>2019-02-26 12:36:18 +0100
committerCatalin Marinas <catalin.marinas@arm.com>2019-02-28 17:48:23 +0000
commit335ebe3035b6fcb83c3f225bc5135300fc24c827 (patch)
tree2f6f093da8a34e9969b6cab3dff85ef090b1363c /lib
parent1ad3935b39da78a403e7df7a3813f866c731bc64 (diff)
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lib/raid6: arm: optimize away a mask operation in NEON recovery routine
The NEON recovery code was modeled after the x86 SIMD code, and for some reason, that code uses a 16 bit wide signed shift and a mask to perform what amounts to a 8 bit unsigned shift. So fold the ops together. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'lib')
-rw-r--r--lib/raid6/recov_neon_inner.c12
1 files changed, 6 insertions, 6 deletions
diff --git a/lib/raid6/recov_neon_inner.c b/lib/raid6/recov_neon_inner.c
index 7d00c31a6547..f13c07f82297 100644
--- a/lib/raid6/recov_neon_inner.c
+++ b/lib/raid6/recov_neon_inner.c
@@ -56,14 +56,14 @@ void __raid6_2data_recov_neon(int bytes, uint8_t *p, uint8_t *q, uint8_t *dp,
px = veorq_u8(vld1q_u8(p), vld1q_u8(dp));
vx = veorq_u8(vld1q_u8(q), vld1q_u8(dq));
- vy = (uint8x16_t)vshrq_n_s16((int16x8_t)vx, 4);
+ vy = vshrq_n_u8(vx, 4);
vx = vqtbl1q_u8(qm0, vandq_u8(vx, x0f));
- vy = vqtbl1q_u8(qm1, vandq_u8(vy, x0f));
+ vy = vqtbl1q_u8(qm1, vy);
qx = veorq_u8(vx, vy);
- vy = (uint8x16_t)vshrq_n_s16((int16x8_t)px, 4);
+ vy = vshrq_n_u8(px, 4);
vx = vqtbl1q_u8(pm0, vandq_u8(px, x0f));
- vy = vqtbl1q_u8(pm1, vandq_u8(vy, x0f));
+ vy = vqtbl1q_u8(pm1, vy);
vx = veorq_u8(vx, vy);
db = veorq_u8(vx, qx);
@@ -97,9 +97,9 @@ void __raid6_datap_recov_neon(int bytes, uint8_t *p, uint8_t *q, uint8_t *dq,
vx = veorq_u8(vld1q_u8(q), vld1q_u8(dq));
- vy = (uint8x16_t)vshrq_n_s16((int16x8_t)vx, 4);
+ vy = vshrq_n_u8(vx, 4);
vx = vqtbl1q_u8(qm0, vandq_u8(vx, x0f));
- vy = vqtbl1q_u8(qm1, vandq_u8(vy, x0f));
+ vy = vqtbl1q_u8(qm1, vy);
vx = veorq_u8(vx, vy);
vy = veorq_u8(vx, vld1q_u8(p));