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use signbit instead of isinf to determine floating point sign

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glibc's use of isinf's return value to indicate sign is a non-standard
extension which can't be relied upon on other platforms.
This commit is contained in:
Joel Dice
2012-08-12 14:52:48 -06:00
parent b98abe3f94
commit 20a290b992
2 changed files with 8 additions and 9 deletions
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9
src/interpret.cpp
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@ -1081,7 +1081,7 @@ interpret3(Thread* t, const int base)
double f = popDouble(t);
switch (fpclassify(f)) {
case FP_NAN: pushInt(t, 0); break;
case FP_INFINITE: pushInt(t, isinf(f) == 1 ? INT32_MAX : INT32_MIN); break;
case FP_INFINITE: pushInt(t, signbit(f) ? INT32_MIN : INT32_MAX); break;
default: pushInt
(t, f >= INT32_MAX ? INT32_MAX
: (f <= INT32_MIN ? INT32_MIN : static_cast<int32_t>(f)));
@ -1093,8 +1093,7 @@ interpret3(Thread* t, const int base)
double f = popDouble(t);
switch (fpclassify(f)) {
case FP_NAN: pushLong(t, 0); break;
case FP_INFINITE: pushLong(t, isinf(f) == 1 ? INT64_MAX : INT64_MIN);
break;
case FP_INFINITE: pushLong(t, signbit(f) ? INT64_MIN : INT64_MAX); break;
default: pushLong
(t, f >= INT64_MAX ? INT64_MAX
: (f <= INT64_MIN ? INT64_MIN : static_cast<int64_t>(f)));
@ -1298,7 +1297,7 @@ interpret3(Thread* t, const int base)
float f = popFloat(t);
switch (fpclassify(f)) {
case FP_NAN: pushInt(t, 0); break;
case FP_INFINITE: pushInt(t, isinf(f) == 1 ? INT32_MAX : INT32_MIN); break;
case FP_INFINITE: pushInt(t, signbit(f) ? INT32_MIN : INT32_MAX); break;
default: pushInt(t, f >= INT32_MAX ? INT32_MAX
: (f <= INT32_MIN ? INT32_MIN : static_cast<int32_t>(f)));
break;
@ -1309,7 +1308,7 @@ interpret3(Thread* t, const int base)
float f = popFloat(t);
switch (fpclassify(f)) {
case FP_NAN: pushLong(t, 0); break;
case FP_INFINITE: pushLong(t, isinf(f) == 1 ? INT64_MAX : INT64_MIN);
case FP_INFINITE: pushLong(t, signbit(f) ? INT64_MIN : INT64_MAX);
break;
default: pushLong(t, static_cast<int64_t>(f)); break;
}