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From: "jakub at gcc dot gnu dot org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug c++/19263] [3.4/4.0 regression]: wrong-code: explicit inicialization of v8qi miscompiled Date: Wed, 12 Jan 2005 18:00:00 -0000 [thread overview] Message-ID: <20050112180020.23133.qmail@sourceware.org> (raw) In-Reply-To: <20050105125215.19263.smelkov@mph1.phys.spbu.ru> ------- Additional Comments From jakub at gcc dot gnu dot org 2005-01-12 18:00 ------- This seems to be because of the CONSTRUCTOR_ELTS (init) = NULL; added in http://gcc.gnu.org/ml/gcc-patches/2004-01/msg00832.html by Richard. If I remove it, the testcase works, as well as this bigger one below. Wiping the initializers of the vector can't be right, so either that line can be just deleted, or we want to create zero vector and then initialize it field by field with the original values. typedef signed char v8qi __attribute__ ((vector_size (8))); extern "C" void abort (void); static unsigned char S[16]; struct A { int i; v8qi j, k; int l; }; void foo (unsigned char v) { A a = { 1, { v, v, v, v, v, v, v, v }, { v + 1, v + 1, v + 1, v + 1, v + 1, v + 1, v + 1, v + 1 }, 3 }; v8qi *s = (v8qi *) & S[0]; *s = a.j; s[1] = a.k; } void bar (unsigned char v) { v8qi val8 = { v, v, v, v, v, v, v, v }; v8qi *s = (v8qi *) & S[0]; *s = val8; } int main () { int i; foo (1); for (i = 0; i < 8; ++i) if (S[i] != 1) abort (); for (; i < 16; ++i) if (S[i] != 2) abort (); bar (3); for (i = 0; i < 8; ++i) if (S[i] != 3) abort (); return 0; } -- What |Removed |Added ---------------------------------------------------------------------------- CC| |rth at gcc dot gnu dot org http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19263
next prev parent reply other threads:[~2005-01-12 18:00 UTC|newest] Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top 2005-01-05 12:52 [Bug c++/19263] New: [g++-3.4.3 " smelkov at mph1 dot phys dot spbu dot ru 2005-01-05 14:48 ` [Bug c++/19263] [3.4/4.0 " pinskia at gcc dot gnu dot org 2005-01-05 14:57 ` pinskia at gcc dot gnu dot org 2005-01-12 17:30 ` jakub at gcc dot gnu dot org 2005-01-12 18:00 ` jakub at gcc dot gnu dot org [this message] 2005-01-12 18:30 ` jakub at gcc dot gnu dot org 2005-01-12 19:16 ` pinskia at gcc dot gnu dot org 2005-01-14 23:46 ` [Bug c++/19263] [3.4/4.0 regression]: wrong-code: explicit initialization " cvs-commit at gcc dot gnu dot org 2005-01-14 23:52 ` cvs-commit at gcc dot gnu dot org 2005-01-15 1:50 ` pinskia at gcc dot gnu dot org
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