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fix NaN handling in floating point comparisons

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This commit is contained in:
Joel Dice 2013-04-03 16:08:40 -06:00
parent cc8d655762
commit b436bd460a
4 changed files with 69 additions and 8 deletions
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3
src/codegen/target/x86/encode.cpp
View File

@ -243,6 +243,9 @@ void branch(Context* c, lir::TernaryOperation op, lir::Constant* target) {
void branchFloat(Context* c, lir::TernaryOperation op, lir::Constant* target) {
switch (op) {
case lir::JumpIfFloatEqual:
// jp past the je so we don't jump to the target if unordered:
c->code.append(0x7a);
c->code.append(6);
conditional(c, 0x84, target);
break;

28
src/compile.cpp
View File

@ -2467,13 +2467,27 @@ getJClassFromReference(MyThread* t, object pair)
referenceName(t, pairSecond(t, pair)))));
}
bool
isNaN(double v)
{
return fpclassify(v) == FP_NAN;
}
bool
isNaN(float v)
{
return fpclassify(v) == FP_NAN;
}
int64_t
compareDoublesG(uint64_t bi, uint64_t ai)
{
double a = bitsToDouble(ai);
double b = bitsToDouble(bi);
if (a < b) {
if (isNaN(a) or isNaN(b)) {
return 1;
} else if (a < b) {
return -1;
} else if (a > b) {
return 1;
@ -2490,7 +2504,9 @@ compareDoublesL(uint64_t bi, uint64_t ai)
double a = bitsToDouble(ai);
double b = bitsToDouble(bi);
if (a < b) {
if (isNaN(a) or isNaN(b)) {
return -1;
} else if (a < b) {
return -1;
} else if (a > b) {
return 1;
@ -2507,7 +2523,9 @@ compareFloatsG(uint32_t bi, uint32_t ai)
float a = bitsToFloat(ai);
float b = bitsToFloat(bi);
if (a < b) {
if (isNaN(a) or isNaN(b)) {
return 1;
} if (a < b) {
return -1;
} else if (a > b) {
return 1;
@ -2524,7 +2542,9 @@ compareFloatsL(uint32_t bi, uint32_t ai)
float a = bitsToFloat(ai);
float b = bitsToFloat(bi);
if (a < b) {
if (isNaN(a) or isNaN(b)) {
return -1;
} if (a < b) {
return -1;
} else if (a > b) {
return 1;

28
src/interpret.cpp
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@ -680,6 +680,18 @@ store(Thread* t, unsigned index)
BytesPerWord * 2);
}
bool
isNaN(double v)
{
return fpclassify(v) == FP_NAN;
}
bool
isNaN(float v)
{
return fpclassify(v) == FP_NAN;
}
uint64_t
findExceptionHandler(Thread* t, object method, unsigned ip)
{
@ -1157,7 +1169,9 @@ interpret3(Thread* t, const int base)
double b = popDouble(t);
double a = popDouble(t);
if (a < b) {
if (isNaN(a) or isNaN(b)) {
pushInt(t, 1);
} if (a < b) {
pushInt(t, static_cast<unsigned>(-1));
} else if (a > b) {
pushInt(t, 1);
@ -1172,7 +1186,9 @@ interpret3(Thread* t, const int base)
double b = popDouble(t);
double a = popDouble(t);
if (a < b) {
if (isNaN(a) or isNaN(b)) {
pushInt(t, static_cast<unsigned>(-1));
} if (a < b) {
pushInt(t, static_cast<unsigned>(-1));
} else if (a > b) {
pushInt(t, 1);
@ -1370,7 +1386,9 @@ interpret3(Thread* t, const int base)
float b = popFloat(t);
float a = popFloat(t);
if (a < b) {
if (isNaN(a) or isNaN(b)) {
pushInt(t, 1);
} if (a < b) {
pushInt(t, static_cast<unsigned>(-1));
} else if (a > b) {
pushInt(t, 1);
@ -1385,7 +1403,9 @@ interpret3(Thread* t, const int base)
float b = popFloat(t);
float a = popFloat(t);
if (a < b) {
if (isNaN(a) or isNaN(b)) {
pushInt(t, static_cast<unsigned>(-1));
} if (a < b) {
pushInt(t, static_cast<unsigned>(-1));
} else if (a > b) {
pushInt(t, 1);

18
test/Floats.java
View File

@ -329,5 +329,23 @@ public class Floats {
{ float v = Float.POSITIVE_INFINITY;
expect(Long.MAX_VALUE == (long) v); }
expect(Double.NaN != Double.NaN);
expect(! (Double.NaN == Double.NaN));
{ double d = Double.NaN;
expect(Double.NaN != d);
expect(! (Double.NaN == d));
expect(d != d);
expect(! (d == d)); }
expect(Float.NaN != Float.NaN);
expect(! (Float.NaN == Float.NaN));
{ float d = Float.NaN;
expect(Float.NaN != d);
expect(! (Float.NaN == d));
expect(d != d);
expect(! (d == d)); }
}
}