diff options
| author | Paul Davis <paul@linuxaudiosystems.com> | 2015-05-12 21:27:33 -0400 |
|---|---|---|
| committer | Paul Davis <paul@linuxaudiosystems.com> | 2015-06-29 14:18:13 -0400 |
| commit | 0d78359d297a1cffb498f2d104e6fb0ff249a226 (patch) | |
| tree | b09b89203491645309ee3829ee5c9d7a835dbebb | |
| parent | 8bb54f41c66ff7db27dff8a06cc28e04bcd0c263 (diff) | |
meter computation must use absolute value of all samples (ignoring sign bit)
| -rw-r--r-- | libs/ardour/sse_avx_functions_64bit_win.s | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/libs/ardour/sse_avx_functions_64bit_win.s b/libs/ardour/sse_avx_functions_64bit_win.s index 22829db98a..2e82ab8728 100644 --- a/libs/ardour/sse_avx_functions_64bit_win.s +++ b/libs/ardour/sse_avx_functions_64bit_win.s @@ -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++; |