Well strictly speaking the IEEE754 floating point standard, e.g.
var half : real = 0x1p-1; // 0.5
var four : real = 0x1p2; // 4.0
var _128 : real = 0x1p7; // 128.0
Can somebody please stick that onto what is already very long list?
If somebody wants to correctly point me to the place in the compiler which
interpret's constants, I can probably hack it in.
With any apologies for underestimating the work in advance, but I think
that this is just adding before line 98 new definitions like, and I know
my rough attempt at a definition is wrong,
floatLiteral4 0[xX]{hexDigit}+[pP][\+\-]?{digit}+
floatLiteral5 0[xX]{hexDigit}+"."{hexDigit}+[pP][\+\-]?{digit}+
and appending to line 98 (i.e. the definition of floatLiteral
|{floatLiteral4}|{floatLiteral5}
Because the (bison/yacc) compiler ultimately calls
'strtod'
to interpret the string (to convert it to real) down in 'build.cpp', it
should be able to handle this, except, ...., and I could not figure out
all the options used. I am assuming you do not then explicitly force the
C++ compiler to NOT handle C99 constants, which by default a strict C++
compiler should not do, but which g++ does.
Thanks - Damian
When I have time to burn, I will look at the grammar below which I think
is correct for the new IEEE 754 standard and deduce up a clean Lex/Flex
definition for floatLiteral4 and floatLiteral5. Sorry my Flex/Lex and
Yacc/Bison is very, very rusty so the above was very crude.
Digits
(one of)
0 1 2 3 4 5 6 7 8 9
HexDigits
(one of)
0 1 2 3 4 5 6 7 8 9 a b c d e f A B C D E F
SignedInteger:
[Sign] Digits
Sign:
(one of)
+ -
FloatTypeSuffix:
(one of)
f F d D
HexNumeral
0 x [HexDigits]
0 X [HexDigits]
HexSignificand:
HexNumeral [.]
0 x [HexDigits] . HexDigits
0 X [HexDigits] . HexDigits
BinaryExponentIndicator:
(one of)
p P
BinaryExponent:
BinaryExponentIndicator SignedInteger
HexadecimalFloatingPointLiteral:
HexSignificand BinaryExponent [FloatTypeSuffix]
Note that because CHAPEL only ever converts (inside build.cpp) to double
for floating point constants, i.e. never calls 'strtof', we might need to
strip the
FloatTypeSuffix
before feeding the constant to 'strtod'. .... Yes, that needs more
thought.
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