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alias.c (find_base_value): Only return the known base value for pseudo registers. 

* alias.c (find_base_value): Only return the known base value for
        pseudo registers.

From-SVN: r16345
This commit is contained in:
Jeffrey A Law 1997-11-05 21:24:45 +00:00 committed by Jeff Law
parent 4f9ca067a1
commit eaf407a54e
2 changed files with 13 additions and 4 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
Wed Nov 5 14:26:05 1997 Jeffrey A Law (law@cygnus.com)
* alias.c (find_base_value): Only return the known base value for
pseudo registers.
Wed Nov 5 11:27:14 1997 Jim Wilson <wilson@cygnus.com>
* i386.c (load_pic_register): Call prologue_get_pc_and_set_got.

12
gcc/alias.c
View File

@ -102,10 +102,14 @@ find_base_value (src)
if (REGNO (src) < FIRST_PSEUDO_REGISTER && copying_arguments)
return new_reg_base_value[REGNO (src)];
/* If this REG is related to a known base value, return it.
This must happen after the arg register check above to avoid
circular set chains. */
if (reg_base_value[REGNO (src)])
/* If a pseudo has a known base value, return it. Do not do this
for hard regs since it can result in a circular dependency
chain for registers which have values at function entry.
The test above is not sufficient because the scheduler may move
a copy out of an arg reg past the NOTE_INSN_FUNCTION_BEGIN. */
if (REGNO (src) >= FIRST_PSEUDO_REGISTER
&& reg_base_value[REGNO (src)])
return reg_base_value[REGNO (src)];
return src;