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Code Issues 1 Releases Wiki Activity

Make nanboxing on 64 bit platforms not the default.

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64 bit nanboxing is kind of sketchy on non x86 architectures.
32 bit architectures seem to work better as the 32 implementation
doesn't rely on the format of the address space and layout of
double's in memory.
This commit is contained in:
Calvin Rose 2019-04-18 12:52:28 -04:00
parent d1eca1cf52
commit 4ddf90e301
2 changed files with 6 additions and 1 deletions
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2
src/core/inttypes.c
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@ -83,6 +83,7 @@ static const JanetAbstractType it_u64_type = {
int64_t janet_unwrap_s64(Janet x) {
switch (janet_type(x)) {
default: break;
case JANET_NUMBER : {
double dbl = janet_unwrap_number(x);
if (fabs(dbl) <= MAX_INT_IN_DBL)
@ -110,6 +111,7 @@ int64_t janet_unwrap_s64(Janet x) {
uint64_t janet_unwrap_u64(Janet x) {
switch (janet_type(x)) {
default: break;
case JANET_NUMBER : {
double dbl = janet_unwrap_number(x);
if ((dbl >= 0) && (dbl <= MAX_INT_IN_DBL))

5
src/include/janet.h
View File

@ -197,7 +197,10 @@ extern "C" {
#ifndef JANET_NO_NANBOX
#ifdef JANET_32
#define JANET_NANBOX_32
#else
#elif defined(__x86_64__) || defined(_WIN64)
/* We will only enable nanboxing by default on 64 bit systems
* on x86. This is mainly because the approach is tied to the
* implicit 47 bit address space. */
#define JANET_NANBOX_64
#endif
#endif