[Git][cmucl/cmucl][master] Add comment on why RESTORE_FPU is needed.

[Raymond Toy]

Raymond Toy pushed to branch master at cmucl / cmucl


Commits:
6feaee2d by Raymond Toy at 2016-01-16T08:37:03Z
Add comment on why RESTORE_FPU is needed.

- - - - -


1 changed file:

- src/lisp/x86-arch.c


Changes:

=====================================
src/lisp/x86-arch.c
=====================================
--- a/src/lisp/x86-arch.c
+++ b/src/lisp/x86-arch.c
@@ -320,6 +320,12 @@ sigtrap_handler(HANDLER_ARGS)
     /* This is just for info in case monitor wants to print an approx */
     current_control_stack_pointer = (unsigned long *) SC_SP(os_context);
 
+
+    /*
+     * In many places in the switch below, we eventually throw instead
+     * of returning from the signal handler.  So, just in case, set
+     * the current FPU modes from the saved context.
+     */
     RESTORE_FPU(os_context);
 
     /*



View it on GitLab: https://gitlab.common-lisp.net/cmucl/cmucl/commit/6feaee2df686c62509f7c2292df81899af9762ed
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