From 0922c6b01bd50f0ce6e659f765c244f6a8f29eb3 Mon Sep 17 00:00:00 2001
From: James Almer <jamrial@gmail.com>
Date: Thu, 22 Sep 2022 17:10:37 -0300
Subject: [PATCH] x86/lpc: use fused negative multiply-add instructions where
useful
Signed-off-by: James Almer <jamrial@gmail.com>
---
libavcodec/x86/lpc.asm | 17 +++++++++++++++--
1 file changed, 15 insertions(+), 2 deletions(-)
diff --git a/libavcodec/x86/lpc.asm b/libavcodec/x86/lpc.asm
index 61a5796e5dc..a585c17ef58 100644
--- a/libavcodec/x86/lpc.asm
+++ b/libavcodec/x86/lpc.asm
@@ -79,11 +79,12 @@ cglobal lpc_apply_welch_window, 3, 5, 8, data, len, out, off1, off2
.loop_o:
movapd m1, m6
- mulpd m2, m0, m0
- subpd m1, m2
%if cpuflag(avx2)
+ fnmaddpd m1, m0, m0, m1
vpermpd m2, m1, q0123
%else
+ mulpd m2, m0, m0
+ subpd m1, m2
shufpd m2, m1, m1, 01b
%endif
@@ -116,8 +117,12 @@ cglobal lpc_apply_welch_window, 3, 5, 8, data, len, out, off1, off2
.loop_o_scalar:
movapd xm1, xm6
+%if cpuflag(avx2)
+ fnmaddpd xm1, xm0, xm0, xm1
+%else
mulpd xm2, xm0, xm0
subpd xm1, xm2
+%endif
cvtdq2pd xm3, [dataq + off1q]
cvtdq2pd xm4, [dataq + off2q]
@@ -174,8 +179,12 @@ cglobal lpc_apply_welch_window, 3, 5, 8, data, len, out, off1, off2
.loop_e:
movapd m1, m6
+%if cpuflag(avx2)
+ fnmaddpd m1, m0, m0, m1
+%else
mulpd m2, m0, m0
subpd m1, m2
+%endif
%if cpuflag(avx2)
vpermpd m2, m1, q0123
%else
@@ -210,8 +219,12 @@ cglobal lpc_apply_welch_window, 3, 5, 8, data, len, out, off1, off2
.loop_e_scalar:
movapd xm1, xm6
+%if cpuflag(avx2)
+ fnmaddpd xm1, xm0, xm0, xm1
+%else
mulpd xm2, xm0, xm0
subpd xm1, xm2
+%endif
cvtdq2pd xm3, [dataq + off1q]
cvtdq2pd xm4, [dataq + off2q]
--
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