Implementation notes: amd64, margaux, crypto_dh/prjfp128bk

Compiler output

io.c: io.c:352:14: warning: equality comparison with extraneous parentheses [-Wparentheses-equality]
io.c:                 if((buf[i] == -1)){
io.c:                     ~~~~~~~^~~~~
io.c: io.c:352:14: note: remove extraneous parentheses around the comparison to silence this warning
io.c:                 if((buf[i] == -1)){
io.c:                    ~       ^    ~
io.c: io.c:352:14: note: use '=' to turn this equality comparison into an assignment
io.c:                 if((buf[i] == -1)){
io.c:                            ^~
io.c:                            =
io.c: io.c:379:14: warning: equality comparison with extraneous parentheses [-Wparentheses-equality]
io.c:                 if((buf[i] == -1)){
io.c:                     ~~~~~~~^~~~~
io.c: io.c:379:14: note: remove extraneous parentheses around the comparison to silence this warning
io.c:                 if((buf[i] == -1)){
io.c:                    ~       ^    ~
io.c: io.c:379:14: note: use '=' to turn this equality comparison into an assignment
io.c:                 if((buf[i] == -1)){
io.c:                            ^~
io.c:                            =
io.c: 2 warnings generated.