motiejus/zig
1
Fork 0
Code Releases Activity

stage1: Fix negation for zero floating point values

Browse Source 
Toggling the sign by computing 0-x doesn't really work for zero values.
This commit is contained in:
LemonBoy
2021-04-15 18:12:11 +02:00
parent c59241bda0
commit f9481402f0
4 changed files with 22 additions and 14 deletions
Download Patch File Download Diff File Expand all files Collapse all files

9
src/stage1/bigfloat.cpp
View File

@@ -9,6 +9,7 @@
#include "bigint.hpp"
#include "buffer.hpp"
#include "softfloat.hpp"
#include "softfloat_ext.hpp"
#include "parse_f128.h"
#include <stdio.h>
#include <math.h>
@@ -60,9 +61,7 @@ void bigfloat_init_bigint(BigFloat *dest, const BigInt *op) {
if (i == 0) {
if (op->is_negative) {
float128_t zero_f128;
ui32_to_f128M(0, &zero_f128);
f128M_sub(&zero_f128, &dest->value, &dest->value);
f128M_neg(&dest->value, &dest->value);
}
return;
}
@@ -89,9 +88,7 @@ void bigfloat_add(BigFloat *dest, const BigFloat *op1, const BigFloat *op2) {
}
void bigfloat_negate(BigFloat *dest, const BigFloat *op) {
float128_t zero_f128;
ui32_to_f128M(0, &zero_f128);
f128M_sub(&zero_f128, &op->value, &dest->value);
f128M_neg(&op->value, &dest->value);
}
void bigfloat_sub(BigFloat *dest, const BigFloat *op1, const BigFloat *op2) {