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re PR c/7411 (cistore.c:392: Internal compiler error in instantiate_virtual_regs_1, at function.c:3974)

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PR c/7411
 * expr.c (expand_expr) [PLUS]: Simplify after the operands
 have been expanded in EXPAND_NORMAL mode.

Co-Authored-By: Volker Reichelt <reichelt@igpm.rwth-aachen.de>

From-SVN: r57882
This commit is contained in:
Eric Botcazou 2002-10-07 09:37:12 +02:00 committed by Richard Henderson
parent fe736b6c2c
commit 4ef7870a4d
3 changed files with 29 additions and 4 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
2002-09-25 Eric Botcazou <ebotcazou@libertysurf.fr>
Volker Reichelt <reichelt@igpm.rwth-aachen.de>
PR c/7411
* expr.c (expand_expr) [PLUS]: Simplify after the operands
have been expanded in EXPAND_NORMAL mode.
2002-10-06 Richard Henderson <rth@redhat.com>
* config/rs6000/rs6000.md (load_toc_v4_PIC_2): Fix base constraint.

15
gcc/expr.c
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@ -7899,16 +7899,23 @@ expand_expr (exp, target, tmode, modifier)
}
}
if (! safe_from_p (subtarget, TREE_OPERAND (exp, 1), 1))
subtarget = 0;
/* No sense saving up arithmetic to be done
if it's all in the wrong mode to form part of an address.
And force_operand won't know whether to sign-extend or
zero-extend. */
if ((modifier != EXPAND_SUM && modifier != EXPAND_INITIALIZER)
|| mode != ptr_mode)
goto binop;
if (! safe_from_p (subtarget, TREE_OPERAND (exp, 1), 1))
subtarget = 0;
{
op0 = expand_expr (TREE_OPERAND (exp, 0), subtarget, VOIDmode, 0);
op1 = expand_expr (TREE_OPERAND (exp, 1), NULL_RTX, VOIDmode, 0);
temp = simplify_binary_operation (PLUS, mode, op0, op1);
if (temp)
return temp;
goto binop2;
}
op0 = expand_expr (TREE_OPERAND (exp, 0), subtarget, VOIDmode, modifier);
op1 = expand_expr (TREE_OPERAND (exp, 1), NULL_RTX, VOIDmode, modifier);

11
gcc/testsuite/gcc.c-torture/compile/20021007-1.c Normal file
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@ -0,0 +1,11 @@
/* PR c/7411 */
/* Verify that GCC simplifies the null addition to i before
virtual register substitution tries it and winds up with
a memory to memory move. */
void foo ()
{
int i = 0,j;
i+=j=0;
}