ardour/ardour
ardour/ardour
13
1
Fork 0
Code Pull Requests Releases Activity

meter computation must use absolute value of all samples (ignoring sign bit)

Browse Source
This commit is contained in:
Paul Davis 2015-05-12 21:27:33 -04:00
parent 8bb54f41c6
commit 0d78359d29
1 changed files with 13 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
libs/ardour/sse_avx_functions_64bit_win.s
View File

@ -494,6 +494,12 @@ x86_sse_avx_compute_peak:
cmp $0, %rdx
je .CP_END
#; create the "abs" mask in %xmm3
#; if will be used to discard sign bit
pushq $2147483647
movss (%rsp), %xmm3
addq $8, %rsp
#; Check for alignment
movq %rcx, %r8 #; buf => %rdx
andq $28, %r8 #; mask bits 1 & 2
@ -507,6 +513,7 @@ x86_sse_avx_compute_peak:
#; Load next value from the buffer
movss (%rcx), %xmm1
andps %xmm3, %xmm1 #; mask out sign bit
maxss %xmm1, %xmm0
#; increment buffer, decrement counter
@ -535,9 +542,14 @@ x86_sse_avx_compute_peak:
vshufps $0x00, %ymm0, %ymm0, %ymm0 #; spread single float value to the all 128 bits of xmm0 register
vperm2f128 $0x00, %ymm0, %ymm0, %ymm0 #; extend the first 128 bits of ymm0 register to higher 128 bits
#; broadcast sign mask to the whole ymm3 register
vshufps $0x00, %ymm3, %ymm3, %ymm3 #; spread single float value to the all 128 bits of xmm3 register
vperm2f128 $0x00, %ymm3, %ymm3, %ymm3 #; extend the first 128 bits of ymm3 register to higher 128 bits
.LP_AVX:
vmovaps (%rcx), %ymm1
vandps %ymm3, %ymm1, %ymm1 #; mask out sign bit
vmaxps %ymm1, %ymm0, %ymm0
addq $32, %rcx #; buf+=8
@ -569,6 +581,7 @@ x86_sse_avx_compute_peak:
.POST_START:
movss (%rcx), %xmm1
andps %xmm3, %xmm1 #; mask out sign bit
maxss %xmm1, %xmm0
addq $4, %rcx #; buf++;