From b77856544be1bccf962f5864fb6280b612667905 Mon Sep 17 00:00:00 2001 From: Jakub Jelinek Date: Sat, 6 Dec 2008 13:47:15 +0100 Subject: [PATCH] re PR middle-end/38422 (union/bitfield causes cc1/cc1plus to run out of memory.) PR middle-end/38422 * fold-const.c (fold_unary) : Don't convert MULT_EXPR operands to mult_type if it isn't narrower than op0's type. * gcc.c-torture/execute/pr38422.c: New test. From-SVN: r142521 --- gcc/ChangeLog | 6 ++++++ gcc/fold-const.c | 15 ++++++++++----- gcc/testsuite/ChangeLog | 5 +++++ gcc/testsuite/gcc.c-torture/execute/pr38422.c | 24 ++++++++++++++++++++++++ 4 files changed, 45 insertions(+), 5 deletions(-) create mode 100644 gcc/testsuite/gcc.c-torture/execute/pr38422.c diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 248ba67..89d28bc 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,9 @@ +2008-12-06 Jakub Jelinek + + PR middle-end/38422 + * fold-const.c (fold_unary) : Don't convert MULT_EXPR + operands to mult_type if it isn't narrower than op0's type. + 2008-12-06 Jan Hubicka Jakub Jelinek diff --git a/gcc/fold-const.c b/gcc/fold-const.c index 719b787..8c0cb1d 100644 --- a/gcc/fold-const.c +++ b/gcc/fold-const.c @@ -8351,11 +8351,16 @@ fold_unary (enum tree_code code, tree type, tree op0) mult_type = type; else mult_type = unsigned_type_for (type); - - tem = fold_build2 (MULT_EXPR, mult_type, - fold_convert (mult_type, TREE_OPERAND (op0, 0)), - fold_convert (mult_type, TREE_OPERAND (op0, 1))); - return fold_convert (type, tem); + + if (TYPE_PRECISION (mult_type) < TYPE_PRECISION (TREE_TYPE (op0))) + { + tem = fold_build2 (MULT_EXPR, mult_type, + fold_convert (mult_type, + TREE_OPERAND (op0, 0)), + fold_convert (mult_type, + TREE_OPERAND (op0, 1))); + return fold_convert (type, tem); + } } tem = fold_convert_const (code, type, op0); diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog index 2c7ee3c..bf19792 100644 --- a/gcc/testsuite/ChangeLog +++ b/gcc/testsuite/ChangeLog @@ -1,3 +1,8 @@ +2008-12-06 Jakub Jelinek + + PR middle-end/38422 + * gcc.c-torture/execute/pr38422.c: New test. + 2008-12-06 Janus Weil PR fortran/38415 diff --git a/gcc/testsuite/gcc.c-torture/execute/pr38422.c b/gcc/testsuite/gcc.c-torture/execute/pr38422.c new file mode 100644 index 0000000..e36879d --- /dev/null +++ b/gcc/testsuite/gcc.c-torture/execute/pr38422.c @@ -0,0 +1,24 @@ +/* PR middle-end/38422 */ + +extern void abort (void); + +struct S +{ + int s : (sizeof (int) * __CHAR_BIT__ - 2); +} s; + +void +foo (void) +{ + s.s *= 2; +} + +int +main () +{ + s.s = 24; + foo (); + if (s.s != 48) + abort (); + return 0; +} -- 2.7.4