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(push_reload): Abort is secondary_reload wants same

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class as an input reload.

From-SVN: r5236
This commit is contained in:
Jim Wilson 1993-08-31 14:22:41 -07:00
parent 67d4766b4a
commit f40fac9b07
1 changed files with 15 additions and 0 deletions
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15
gcc/reload.c
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@ -1006,6 +1006,21 @@ push_reload (in, out, inloc, outloc, class,
: type == RELOAD_FOR_OUTPUT ? RELOAD_FOR_OUTPUT_ADDRESS
: type);
/* This case isn't valid, so fail. Reload is allowed to use the
same register for RELOAD_FOR_INPUT_ADDRESS and RELOAD_FOR_INPUT
reloads, but in the case of a secondary register, we actually
need two different registers for correct code. We fail here
to prevent the possibility of silently generating incorrect code
later.
The convention is that secondary input reloads are valid only if
the secondary_class is different from class. If you have such
a case, you can not use secondary reloads, you must work around
the problem some other way. */
if (type == RELOAD_FOR_INPUT && secondary_class == class)
abort ();
/* If we need a tertiary reload, see if we have one we can reuse
or else make one. */