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implement float -> unsigned casts

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amd64 lacks instruction for this so it has to be implemented with
float -> signed casts. The approach is borrowed from llvm.
This commit is contained in:
Bor Grošelj Simić 2022-01-28 02:06:18 +01:00 • committed by Quentin Carbonneaux
parent 74d022f975
commit 3964574a83
6 changed files with 93 additions and 6 deletions
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51
test/fpcnv.ssa
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@ -43,7 +43,37 @@ function d $ltod(l %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<limits.h>
#
# extern float fneg(float);
# extern double ftrunc(double);
#
@ -52,10 +82,19 @@ function d $ltod(l %l) {
# 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,
# 98547543006.49626, 236003043787688.3, 9.499222733527032e+18,
# 1.1936266170755652e+19 };
#
# int main() {
# int i;
#
@ -72,6 +111,18 @@ function d $ltod(l %l) {
# return 6;
# if (ltod(iin[i]) != (double)iin[i])
# return 7;
# }
# for (i=0; i<sizeof(fin)/sizeof(fin[0]); i++) {
# if (stol((float)fin[i]) != (unsigned long long)(float)fin[i])
# return 8;
# if (dtol(fin[i]) != (unsigned long long)fin[i])
# return 9;
# if((unsigned long long)fin[i] > UINT_MAX)
# continue;
# if (stow((float)fin[i]) != (unsigned int)(float)fin[i])
# return 10;
# if (dtow(fin[i]) != (unsigned int)fin[i])
# return 11;
# }
# return 0;
# }