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8054054: 8040121 is broken

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C++ code pattern from 8040121 is incorrect

Reviewed-by: kvn
This commit is contained in:
Roland Westrelin 2014-07-31 19:59:36 +02:00
parent 7a9fc5ff21
commit e546e2a060
2 changed files with 14 additions and 7 deletions
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6
hotspot/src/share/vm/opto/output.cpp
View file

@ -785,7 +785,8 @@ void Compile::FillLocArray( int idx, MachSafePointNode* sfpt, Node *local,
// grow downwards in all implementations.
// (If, on some machine, the interpreter's Java locals or stack
// were to grow upwards, the embedded doubles would be word-swapped.)
jlong_accessor acc = { jlong_cast(d) };
jlong_accessor acc;
acc.long_value = jlong_cast(d);
array->append(new ConstantIntValue(acc.words[1]));
array->append(new ConstantIntValue(acc.words[0]));
#endif
@ -804,7 +805,8 @@ void Compile::FillLocArray( int idx, MachSafePointNode* sfpt, Node *local,
// grow downwards in all implementations.
// (If, on some machine, the interpreter's Java locals or stack
// were to grow upwards, the embedded doubles would be word-swapped.)
jlong_accessor acc = { d };
jlong_accessor acc;
acc.long_value = d;
array->append(new ConstantIntValue(acc.words[1]));
array->append(new ConstantIntValue(acc.words[0]));
#endif

15
hotspot/src/share/vm/runtime/sharedRuntimeMath.hpp
View file

@ -42,29 +42,34 @@ typedef union {
} DoubleIntConv;
static inline int high(double d) {
DoubleIntConv x = { d };
DoubleIntConv x;
x.d = d;
return x.split.hi;
}
static inline int low(double d) {
DoubleIntConv x = { d };
DoubleIntConv x;
x.d = d;
return x.split.lo;
}
static inline void set_high(double* d, int high) {
DoubleIntConv conv = { *d };
DoubleIntConv conv;
conv.d = *d;
conv.split.hi = high;
*d = conv.d;
}
static inline void set_low(double* d, int low) {
DoubleIntConv conv = { *d };
DoubleIntConv conv;
conv.d = *d;
conv.split.lo = low;
*d = conv.d;
}
static double copysignA(double x, double y) {
DoubleIntConv convX = { x };
DoubleIntConv convX;
convX.d = x;
convX.split.hi = (convX.split.hi & 0x7fffffff) | (high(y) & 0x80000000);
return convX.d;
}