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# floating point casts and conversions
export
function s $fneg(s %f) {
@fneg
%b0 =w cast %f
%b1 =w xor 2147483648, %b0
%rs =s cast %b1
ret %rs
}
export
function d $ftrunc(d %f) {
@ftrunc
%l0 =w dtosi %f
%rt =d swtof %l0
ret %rt
}
export
function s $wtos(w %w) {
@start
%rt =s uwtof %w
ret %rt
}
export
function d $wtod(w %w) {
@start
%rt =d uwtof %w
ret %rt
}
export
function s $ltos(l %l) {
@start
%rt =s ultof %l
ret %rt
}
export
function d $ltod(l %l) {
@start
%rt =d ultof %l
ret %rt
}
export
function w $stow(s %f) {
@start
%rt =w stoui %f
ret %rt
}
export
function w $dtow(d %f) {
@start
%rt =w dtoui %f
ret %rt
}
export
function l $stol(s %f) {
@start
%rt =l stoui %f
ret %rt
}
export
function l $dtol(d %f) {
@start
%rt =l dtoui %f
ret %rt
}
# >>> driver
# #include <float.h>
# #include <limits.h>
#
# extern float fneg(float);
# extern double ftrunc(double);
#
# extern float wtos(unsigned int);
# extern double wtod(unsigned int);
# extern float ltos(long long unsigned int);
# extern double ltod(long long unsigned int);
#
# extern unsigned int stow(float);
# extern unsigned int dtow(double);
# extern unsigned long long stol(float);
# extern unsigned long long dtol(double);
#
# unsigned long long iin[] = { 0, 1, 16, 234987, 427386245, 0x7fff0000,
# 0xffff0000, 23602938196141, 72259248152500195, 9589010795705032704ull,
# 0xdcf5fbe299d0148aull, 0xffffffff00000000ull, -1 };
#
# double fin[] = { 0.17346516197824458, 442.0760005466251, 4342856.879893436,
# 4294967295.0, 98547543006.49626, 236003043787688.3, 9.499222733527032e+18,
# 1.1936266170755652e+19 };
#
# int main() {
# int i;
#
# if (fneg(1.23f) != -1.23f) return 1;
# if (ftrunc(3.1415) != 3.0) return 2;
# if (ftrunc(-1.234) != -1.0) return 3;
#
# for (i=0; i<sizeof(iin)/sizeof(iin[0]); i++) {
# if (wtos(iin[i]) != (float) (unsigned int)iin[i])
# return 4;
# if (wtod(iin[i]) != (double)(unsigned int)iin[i])
# return 5;
# if (ltos(iin[i]) != (float) iin[i])
# return 6;
# if (ltod(iin[i]) != (double)iin[i])
# return 7;
# }
# for (i=0; i<sizeof(fin)/sizeof(fin[0]); i++) {
# if (fin[i] >= 1LL << DBL_MANT_DIG)
# break;
# if (dtol(fin[i]) != (unsigned long long)fin[i])
# return 8;
# if((unsigned long long)fin[i] > UINT_MAX)
# continue;
# if (dtow(fin[i]) != (unsigned int)fin[i])
# return 9;
# if (fin[i] >= 1LL << FLT_MANT_DIG)
# continue;
# if (stol((float)fin[i]) != (unsigned long long)(float)fin[i])
# return 10;
# if (stow((float)fin[i]) != (unsigned int)(float)fin[i])
# return 11;
# }
# return 0;
# }
# <<<
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