diff --git a/c/buildasm/copy.asm.ejs b/c/buildasm/copy.asm.ejs
index d851c5f..6f469b1 100644
--- a/c/buildasm/copy.asm.ejs
+++ b/c/buildasm/copy.asm.ejs
@@ -79,3 +79,55 @@ u64toLong_adjust_neg:
         mov    [rdi + <%= (i+1)*8 %>], rax
 <% } %>
         ret
+
+;;;;;;;;;;;;;;;;;;;;;;
+; toInt
+;;;;;;;;;;;;;;;;;;;;;;
+; Convert a 64 bit integer to a long format field element
+; Params:
+;   rsi <= Pointer to the element
+; Returs:
+;   rax <= The value
+;;;;;;;;;;;;;;;;;;;;;;;
+<%=name%>_toInt:
+        mov     rax, [rdi]
+        bt      rax, 63
+        jc      <%=name%>_long
+        movsx   rax, eax
+        ret
+
+<%=name%>_long:
+        mov     rax, [rdi + 8]
+        mov     rcx, rax
+        shr     rcx, 31
+        jnz     <%=name%>_longNeg
+<% for (let i=1; i< n64; i++) { %>
+        mov     rcx, [rdi + <%= i*8+8 %>]
+        test    rcx, rcx
+        jnz     <%=name%>_longNeg
+<% } %>
+        ret
+
+<%=name%>_longNeg:
+        mov     rax, [rdi + 8]
+        sub     rax, [q]
+        jnc     <%=name%>_longErr
+<% for (let i=1; i<n64; i++) { %>
+        mov     rcx, [rdi + <%= i*8+8 %>]
+        sbb     rcx, [q + <%= i*8 %>]
+        jnc     <%=name%>_longErr
+<% } %>
+        mov     rcx, rax
+        sar     rcx, 31
+        add     rcx, 1
+        jnz     <%=name%>_longErr
+        ret
+
+<%=name%>_longErr:
+        push    rdi
+        mov     rdi, 0
+        call    <%=name%>_fail
+        pop     rdi
+
+
+
diff --git a/c/buildasm/fr.asm b/c/buildasm/fr.asm
index 258fe13..597b1b6 100644
--- a/c/buildasm/fr.asm
+++ b/c/buildasm/fr.asm
@@ -23,7 +23,10 @@
         global Fr_toNormal
         global Fr_toLongNormal
         global Fr_toMontgomery
+        global Fr_toInt
+        global Fr_isTrue
         global Fr_q
+        extern Fr_fail
         DEFAULT REL
 
         section .text
@@ -150,6 +153,74 @@ u64toLong_adjust_neg:
 
         ret
 
+;;;;;;;;;;;;;;;;;;;;;;
+; toInt
+;;;;;;;;;;;;;;;;;;;;;;
+; Convert a 64 bit integer to a long format field element
+; Params:
+;   rsi <= Pointer to the element
+; Returs:
+;   rax <= The value
+;;;;;;;;;;;;;;;;;;;;;;;
+Fr_toInt:
+        mov     rax, [rdi]
+        bt      rax, 63
+        jc      Fr_long
+        movsx   rax, eax
+        ret
+
+Fr_long:
+        mov     rax, [rdi + 8]
+        mov     rcx, rax
+        shr     rcx, 31
+        jnz     Fr_longNeg
+
+        mov     rcx, [rdi + 16]
+        test    rcx, rcx
+        jnz     Fr_longNeg
+
+        mov     rcx, [rdi + 24]
+        test    rcx, rcx
+        jnz     Fr_longNeg
+
+        mov     rcx, [rdi + 32]
+        test    rcx, rcx
+        jnz     Fr_longNeg
+
+        ret
+
+Fr_longNeg:
+        mov     rax, [rdi + 8]
+        sub     rax, [q]
+        jnc     Fr_longErr
+
+        mov     rcx, [rdi + 16]
+        sbb     rcx, [q + 8]
+        jnc     Fr_longErr
+
+        mov     rcx, [rdi + 24]
+        sbb     rcx, [q + 16]
+        jnc     Fr_longErr
+
+        mov     rcx, [rdi + 32]
+        sbb     rcx, [q + 24]
+        jnc     Fr_longErr
+
+        mov     rcx, rax
+        sar     rcx, 31
+        add     rcx, 1
+        jnz     Fr_longErr
+        ret
+
+Fr_longErr:
+        push    rdi
+        mov     rdi, 0
+        call    Fr_fail
+        pop     rdi
+
+
+
+
 
 
 
@@ -1432,6 +1503,7 @@ toLongNormal_fromShort:
     movsx   rsi, eax
     call    rawCopyS2L
     mov     rsi, r8                     ; recover rsi
+    ret
 
 
 
@@ -5699,6 +5771,62 @@ lnot_retOne:
         ret
 
 
+;;;;;;;;;;;;;;;;;;;;;;
+; isTrue
+;;;;;;;;;;;;;;;;;;;;;;
+; Convert a 64 bit integer to a long format field element
+; Params:
+;   rsi <= Pointer to the element
+; Returs:
+;   rax <= 1 if true 0 if false
+;;;;;;;;;;;;;;;;;;;;;;;
+Fr_isTrue:
+        
+
+
+
+
+
+    mov     rax, [rdi]
+    bt      rax, 63
+    jc      tmp_64
+
+    test    eax, eax
+    jz      retZero_66
+    jmp     retOne_65
+
+tmp_64:
+
+    mov     rax, [rdi + 8]
+    test    rax, rax
+    jnz     retOne_65
+
+    mov     rax, [rdi + 16]
+    test    rax, rax
+    jnz     retOne_65
+
+    mov     rax, [rdi + 24]
+    test    rax, rax
+    jnz     retOne_65
+
+    mov     rax, [rdi + 32]
+    test    rax, rax
+    jnz     retOne_65
+
+
+retZero_66:
+    mov     qword rax, 0
+    jmp     done_67
+
+retOne_65:
+    mov     qword rax, 1
+
+done_67:
+
+        ret
+
+
+
 
 
         section .data
diff --git a/c/buildasm/fr.asm.ejs b/c/buildasm/fr.asm.ejs
index 83c76a9..6819ec7 100644
--- a/c/buildasm/fr.asm.ejs
+++ b/c/buildasm/fr.asm.ejs
@@ -23,7 +23,10 @@
         global <%=name%>_toNormal
         global <%=name%>_toLongNormal
         global <%=name%>_toMontgomery
+        global <%=name%>_toInt
+        global <%=name%>_isTrue
         global <%=name%>_q
+        extern <%=name%>_fail
         DEFAULT REL
 
         section .text
diff --git a/c/buildasm/fr.c b/c/buildasm/fr.c
index 37daa3a..62c4d57 100644
--- a/c/buildasm/fr.c
+++ b/c/buildasm/fr.c
@@ -179,32 +179,7 @@ void Fr_div(PFrElement r, PFrElement a, PFrElement b) {
     Fr_mul(r, a, &tmp);
 }
 
-int Fr_isTrue(PFrElement pE) {
-    if (!(pE->type & Fr_LONG)) return pE->shortVal != 0;
-    for (int i=0; i< Fr_N64; i++) {
-        if (pE->longVal[i]) return 1;
-    }
-    return 0;
-}
-
-int Fr_toInt(PFrElement pE) {
-    Fr_toNormal(pE);
-    if (!(pE->type & Fr_LONG)) {
-        return pE->shortVal;
-    } else {
-        mpz_t ma;
-        mpz_init(ma);
-        Fr_toMpz(ma, pE);
-        if (mpz_fits_sint_p(ma)) {
-            return mpz_get_si(ma);
-        }
-
-        mpz_sub(ma, ma, q);
-        if (mpz_fits_sint_p(ma)) {
-            return mpz_get_si(ma);
-        } else {
-            assert(false);
-        }
-    }
+void Fr_fail() {
+    assert(false);
 }
 
diff --git a/c/buildasm/fr.c.ejs b/c/buildasm/fr.c.ejs
index 4ab9200..99033ed 100644
--- a/c/buildasm/fr.c.ejs
+++ b/c/buildasm/fr.c.ejs
@@ -179,32 +179,7 @@ void <%=name%>_div(P<%=name%>Element r, P<%=name%>Element a, P<%=name%>Element b
     <%=name%>_mul(r, a, &tmp);
 }
 
-int <%=name%>_isTrue(P<%=name%>Element pE) {
-    if (!(pE->type & <%=name%>_LONG)) return pE->shortVal != 0;
-    for (int i=0; i< <%=name%>_N64; i++) {
-        if (pE->longVal[i]) return 1;
-    }
-    return 0;
-}
-
-int <%=name%>_toInt(P<%=name%>Element pE) {
-    Fr_toNormal(pE);
-    if (!(pE->type & <%=name%>_LONG)) {
-        return pE->shortVal;
-    } else {
-        mpz_t ma;
-        mpz_init(ma);
-        <%=name%>_toMpz(ma, pE);
-        if (mpz_fits_sint_p(ma)) {
-            return mpz_get_si(ma);
-        }
-
-        mpz_sub(ma, ma, q);
-        if (mpz_fits_sint_p(ma)) {
-            return mpz_get_si(ma);
-        } else {
-            assert(false);
-        }
-    }
+void <%=name%>_fail() {
+    assert(false);
 }
 
diff --git a/c/buildasm/fr.h b/c/buildasm/fr.h
index 6bb0760..31a181a 100644
--- a/c/buildasm/fr.h
+++ b/c/buildasm/fr.h
@@ -36,6 +36,16 @@ extern "C" void Fr_lnot(PFrElement r, PFrElement a);
 extern "C" void Fr_toNormal(PFrElement pE);
 extern "C" void Fr_toLongNormal(PFrElement pE);
 extern "C" void Fr_toMontgomery(PFrElement pE);
+
+extern "C" int Fr_isTrue(PFrElement pE);
+extern "C" int Fr_toInt(PFrElement pE);
+
+extern "C" void Fr_fail();
+
+extern FrElement Fr_q;
+
+// Pending functions to convert
+
 void Fr_str2element(PFrElement pE, char const*s);
 char *Fr_element2str(PFrElement pE);
 void Fr_idiv(PFrElement r, PFrElement a, PFrElement b);
@@ -46,12 +56,9 @@ void Fr_shl(PFrElement r, PFrElement a, PFrElement b);
 void Fr_shr(PFrElement r, PFrElement a, PFrElement b);
 void Fr_pow(PFrElement r, PFrElement a, PFrElement b);
 
-int Fr_isTrue(PFrElement pE);
-int Fr_toInt(PFrElement pE);
 
 void Fr_init();
 
-extern FrElement Fr_q;
 
 
 #endif // __FR_H
diff --git a/c/buildasm/fr.h.ejs b/c/buildasm/fr.h.ejs
index ad5fd0f..19e155e 100644
--- a/c/buildasm/fr.h.ejs
+++ b/c/buildasm/fr.h.ejs
@@ -36,6 +36,16 @@ extern "C" void <%=name%>_lnot(P<%=name%>Element r, P<%=name%>Element a);
 extern "C" void <%=name%>_toNormal(P<%=name%>Element pE);
 extern "C" void <%=name%>_toLongNormal(P<%=name%>Element pE);
 extern "C" void <%=name%>_toMontgomery(P<%=name%>Element pE);
+
+extern "C" int <%=name%>_isTrue(P<%=name%>Element pE);
+extern "C" int <%=name%>_toInt(P<%=name%>Element pE);
+
+extern "C" void <%=name%>_fail();
+
+extern <%=name%>Element <%=name%>_q;
+
+// Pending functions to convert
+
 void <%=name%>_str2element(P<%=name%>Element pE, char const*s);
 char *<%=name%>_element2str(P<%=name%>Element pE);
 void <%=name%>_idiv(P<%=name%>Element r, P<%=name%>Element a, P<%=name%>Element b);
@@ -46,12 +56,9 @@ void <%=name%>_shl(P<%=name%>Element r, P<%=name%>Element a, P<%=name%>Element b
 void <%=name%>_shr(P<%=name%>Element r, P<%=name%>Element a, P<%=name%>Element b);
 void <%=name%>_pow(P<%=name%>Element r, P<%=name%>Element a, P<%=name%>Element b);
 
-int <%=name%>_isTrue(P<%=name%>Element pE);
-int <%=name%>_toInt(P<%=name%>Element pE);
 
 void <%=name%>_init();
 
-extern <%=name%>Element <%=name%>_q;
 
 
 #endif // __<%=name.toUpperCase()%>_H
diff --git a/c/buildasm/fr.o b/c/buildasm/fr.o
index 3255705..e352655 100644
Binary files a/c/buildasm/fr.o and b/c/buildasm/fr.o differ
diff --git a/c/buildasm/logicalops.asm.ejs b/c/buildasm/logicalops.asm.ejs
index 1fbbed3..00d90e8 100644
--- a/c/buildasm/logicalops.asm.ejs
+++ b/c/buildasm/logicalops.asm.ejs
@@ -80,3 +80,18 @@ lnot_retOne:
         ret
 
 
+;;;;;;;;;;;;;;;;;;;;;;
+; isTrue
+;;;;;;;;;;;;;;;;;;;;;;
+; Convert a 64 bit integer to a long format field element
+; Params:
+;   rsi <= Pointer to the element
+; Returs:
+;   rax <= 1 if true 0 if false
+;;;;;;;;;;;;;;;;;;;;;;;
+<%=name%>_isTrue:
+        <%=     isTrue("rax", "rdi") %>
+        ret
+
+
+
diff --git a/c/buildasm/main.c b/c/buildasm/main.c
index 7eb607f..d33cefb 100644
--- a/c/buildasm/main.c
+++ b/c/buildasm/main.c
@@ -1,13 +1,15 @@
 #include <stdio.h>
 #include <stdlib.h>
+#include <assert.h>
 #include "fr.h"
 
 int main() {
-
+    Fr_init();
+/*
     FrElement a = { 0, Fr_LONGMONTGOMERY, {1,1,1,1}};
     FrElement b = { 0, Fr_LONGMONTGOMERY, {2,2,2,2}};
 
-/*
+
     FrElement a={0x43e1f593f0000000ULL,0x2833e84879b97091ULL,0xb85045b68181585dULL,0x30644e72e131a029ULL};
     FrElement b = {3,0,0,0};
 
@@ -24,6 +26,7 @@ int main() {
     Fr_mul(&c,&a, &b);
 */
 
+/*
     FrElement a1[10];
     FrElement a2[10];
     for (int i=0; i<10; i++) {
@@ -43,6 +46,19 @@ int main() {
         free(c1);
         free(c2);
     }
+*/
+
+    int tests[7] = { 0, 1, 2, -1, -2, 0x7FFFFFFF, (int)0x80000000};
+    for (int i=0; i<7;i++) {
+        FrElement a = { tests[i], Fr_SHORT, {0,0,0,0}};
+        Fr_toLongNormal(&a);
+        int b = Fr_toInt(&a);
+        int c = Fr_isTrue(&a);
+        printf("%d, %d, %d\n", tests[i], b, c);
+    }
+
+    FrElement err = { 0, Fr_LONGMONTGOMERY, {1,1,1,1}};
+    Fr_toInt(&err);
 
     // printf("%llu, %llu, %llu, %llu\n", c.longVal[0], c.longVal[1], c.longVal[2], c.longVal[3]);
 }
diff --git a/c/buildasm/montgomery.asm.ejs b/c/buildasm/montgomery.asm.ejs
index 097fad7..6cb2f58 100644
--- a/c/buildasm/montgomery.asm.ejs
+++ b/c/buildasm/montgomery.asm.ejs
@@ -338,4 +338,5 @@ toLongNormal_fromShort:
     movsx   rsi, eax
     call    rawCopyS2L
     mov     rsi, r8                     ; recover rsi
+    ret
 
diff --git a/c/buildasm/tester.cpp b/c/buildasm/tester.cpp
index 07792ce..95b2d2a 100644
--- a/c/buildasm/tester.cpp
+++ b/c/buildasm/tester.cpp
@@ -139,6 +139,7 @@ void processLine(std::string &line) {
 
 int main(void)
 {
+    Fr_init();
     fillMap();
     std::string line;
     int i=0;
diff --git a/test/fieldasm.js b/test/fieldasm.js
index 20d5a75..60146ec 100644
--- a/test/fieldasm.js
+++ b/test/fieldasm.js
@@ -13,7 +13,6 @@ const mnt6753r = new bigInt("418984909679189534023442147912406371281707099199539
 
 describe("field asm test", function () {
     this.timeout(1000000000);
-/*
     it("bn128r add", async () => {
         const tv = buildTestVector2(bn128r, "add");
         await tester(bn128r, tv);
@@ -255,7 +254,6 @@ describe("field asm test", function () {
         const tv = buildTestVector2(mnt6753q, "div");
         await tester(mnt6753q, tv);
     });
-*/
     it("bn128r square", async () => {
         const tv = buildTestVector1(bn128r, "square");
         await tester(bn128r, tv);