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Only enable JIT by default on x86-64

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* acinclude.m4: Disable JIT by default on not-x86-64.  Although I got
  JIT mostly working on 32-bit x86, I got nondeterministic segfaults
  deep in lightning, on that platform; perhaps indicating a bug in the
  optimizer.  After a day of poking and not solving the problem, I think
  that I don't want the complexity of Lightning's node representation,
  especially on platforms that get less testing.  In the future we'll
  use the lightning backends without the node layer.
* NEWS: Update.
This commit is contained in:
Andy Wingo 2018-10-10 10:02:55 +02:00
parent e08d10af67
commit 4aa4a6d590
2 changed files with 9 additions and 3 deletions
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5
NEWS
View file

@ -22,8 +22,9 @@ compilation will be enabled automatically and transparently. To disable
JIT compilation, configure Guile with `--enable-jit=no' or
`--disable-jit'. See `./configure --help' for more.
Guile uses an embedded copy of GNU lightning, providing support for JIT
on about a dozen platforms.
In this release, JIT compilation is enabled only on x86-64. In future
prereleases support will be added for all architectures supported by GNU
lightning.
** Lower-level bytecode

7
acinclude.m4
View file

@ -614,7 +614,12 @@ AC_DEFUN([GUILE_ENABLE_JIT], [
case "x$enable_jit" in
xy*) enable_jit=yes ;;
xn*) enable_jit=no ;;
xa* | x) enable_jit=$JIT_AVAILABLE ;;
xa* | x)
# For the time being, only enable JIT on x86-64.
case "$target_cpu" in
x86_64|amd64) enable_jit=yes ;;
*) enable_jit=no ;;
esac
*) AC_MSG_ERROR(bad value $enable_jit for --enable-jit) ;;
esac
AC_MSG_RESULT($enable_jit)