circom/c/buildasm/logicalops.asm.ejs

<% function isTrue(resReg, srcPtrReg) { %>
<% const longIsZero = global.tmpLabel() %>
<% const retOne = global.tmpLabel("retOne") %>
<% const retZero = global.tmpLabel("retZero") %>
<% const done = global.tmpLabel("done") %>

    mov     rax, [<%=srcPtrReg%>]
    bt      rax, 63
    jc      <%= longIsZero %>

    test    eax, eax
    jz      <%= retZero %>
    jmp     <%= retOne %>

<%= longIsZero %>:
<%   for (let i=0; i<n64; i++) { %>
    mov     rax, [<%= srcPtrReg + " + " +(i*8+8) %>]
    test    rax, rax
    jnz     <%= retOne %>
<%   } %>

<%= retZero %>:
    mov     qword <%=resReg%>, 0
    jmp     <%= done %>

<%= retOne %>:
    mov     qword <%=resReg%>, 1

<%= done %>:
<% } %>




<% function logicalOp(op) { %>
;;;;;;;;;;;;;;;;;;;;;;
; l<%= op %>
;;;;;;;;;;;;;;;;;;;;;;
; Logical <%= op %> between two elements
; Params:
;   rsi <= Pointer to element 1
;   rdx <= Pointer to element 2
;   rdi <= Pointer to result zero or one
; Modified Registers:
;    rax, rcx, r8
;;;;;;;;;;;;;;;;;;;;;;
<%=name%>_l<%=op%>:
<%=     isTrue("r8", "rsi") %>
<%=     isTrue("rcx", "rdx") %>
        <%=op%> rcx, r8
        mov [rdi], rcx
        ret
<% } %>

<% logicalOp("and"); %>
<% logicalOp("or"); %>

;;;;;;;;;;;;;;;;;;;;;;
; lnot
;;;;;;;;;;;;;;;;;;;;;;
; Do the logical not of an element
; Params:
;   rsi <= Pointer to element to be tested
;   rdi <= Pointer to result one if element1 is zero and zero otherwise
; Modified Registers:
;    rax, rax, r8
;;;;;;;;;;;;;;;;;;;;;;
<%=name%>_lnot:
<%=     isTrue("rcx", "rsi") %>
        test rcx, rcx

        jz lnot_retOne
lnot_retZero:
        mov qword [rdi], 0
        ret
lnot_retOne:
        mov qword [rdi], 1
        ret