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optimize(templates): use pushf / popf to save & recall stereo bit, instead of bt [...]

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vsariola 2021-03-28 12:38:09 +03:00
parent d5d9f48d2d
commit 9a798df55a
1 changed files with 2 additions and 1 deletions
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templates/amd64-386/patch.asm
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@ -29,6 +29,7 @@ su_run_vm_loop: ; loop until all voices done
shr edi, 1 ; shift out the LSB bit = stereo bit
je su_run_vm_advance ; the opcode is zero, jump to advance
mov {{.INP}}, [{{.Stack "Voice"}}] ; reset INP to point to the inputs part of voice
pushf ; push flags to save carry = stereo bit
add {{.INP}}, su_voice.inputs
xor ecx, ecx ; counter = 0
xor eax, eax ; clear out high bits of eax, as lodsb only sets al
@ -49,7 +50,7 @@ su_transform_values_loop:
inc ecx
jmp su_transform_values_loop
su_transform_values_out:
bt dword [{{.COM}}-1],0 ; LSB of COM = stereo bit => carry
popf ; pop flags for the carry bit = stereo bit
{{- .SaveStack "Opcode"}}
{{- $x := printf "su_vm_jumptable-%v" .PTRSIZE}}
{{- .Prepare $x | indent 4}}