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re PR tree-optimization/21541 (gcc.c-torture/execute/20031215-1.c compilation fails)

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PR 21541
        * ifcvt.c (noce_process_if_block): Avoid conversion when the
        memory destination is readonly.

From-SVN: r99951
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Richard Henderson 2005-05-18 23:29:45 -07:00 • committed by Richard Henderson
parent e82766657d
commit d2751e9ed5
2 changed files with 14 additions and 0 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2005-05-18 Richard Henderson <rth@redhat.com>
PR 21541
* ifcvt.c (noce_process_if_block): Avoid conversion when the
memory destination is readonly.
2005-05-18 Richard Henderson <rth@redhat.com>
PR 21541

8
gcc/ifcvt.c
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@ -1981,6 +1981,14 @@ noce_process_if_block (struct ce_if_block * ce_info)
if (side_effects_p (x))
return FALSE;
/* If x is a read-only memory, then the program is valid only if we
avoid the store into it. If there are stores on both the THEN and
ELSE arms, then we can go ahead with the conversion; either the
program is broken, or the condition is always false such that the
other memory is selected. */
if (!set_b && MEM_P (x) && MEM_READONLY_P (x))
return FALSE;
b = (set_b ? SET_SRC (set_b) : x);
/* Only operate on register destinations, and even then avoid extending