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| author | Jakub Jelinek <jakub@redhat.com> | 2011-01-18 08:45:12 +0100 |
|---|---|---|
| committer | Jakub Jelinek <jakub@gcc.gnu.org> | 2011-01-18 08:45:12 +0100 |
| commit | e7ef91dc8eb398de7b6c780b00f1360dafd84798 (patch) | |
| tree | 020c8a49163b7cf9347b1c3455970378ec548bc7 /gcc/expr.c | |
| parent | fb70168707ecbe4175c069f6c36baa8986a075bd (diff) | |
| download | gcc-e7ef91dc8eb398de7b6c780b00f1360dafd84798.zip gcc-e7ef91dc8eb398de7b6c780b00f1360dafd84798.tar.gz gcc-e7ef91dc8eb398de7b6c780b00f1360dafd84798.tar.bz2 | |
re PR rtl-optimization/47299 (Widening multiply optimization generates bad code)
PR rtl-optimization/47299
* expr.c (expand_expr_real_2) <case WIDEN_MULT_EXPR>: Don't use
subtarget. Use normal multiplication if both operands are
constants.
* expmed.c (expand_widening_mult): Don't try to optimize constant
multiplication if op0 has VOIDmode. Convert op1 constant to mode
before using it.
* gcc.c-torture/execute/pr47299.c: New test.
From-SVN: r168944
Diffstat (limited to 'gcc/expr.c')
| -rw-r--r-- | gcc/expr.c | 9 |
1 files changed, 5 insertions, 4 deletions
@@ -1,6 +1,6 @@ /* Convert tree expression to rtl instructions, for GNU compiler. Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, - 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 + 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc. This file is part of GCC. @@ -7631,10 +7631,10 @@ expand_expr_real_2 (sepops ops, rtx target, enum machine_mode tmode, if (optab_handler (this_optab, mode) != CODE_FOR_nothing) { if (TYPE_UNSIGNED (TREE_TYPE (treeop0))) - expand_operands (treeop0, treeop1, subtarget, &op0, &op1, + expand_operands (treeop0, treeop1, NULL_RTX, &op0, &op1, EXPAND_NORMAL); else - expand_operands (treeop0, treeop1, subtarget, &op1, &op0, + expand_operands (treeop0, treeop1, NULL_RTX, &op1, &op0, EXPAND_NORMAL); goto binop3; } @@ -7652,7 +7652,8 @@ expand_expr_real_2 (sepops ops, rtx target, enum machine_mode tmode, optab other_optab = zextend_p ? smul_widen_optab : umul_widen_optab; this_optab = zextend_p ? umul_widen_optab : smul_widen_optab; - if (mode == GET_MODE_2XWIDER_MODE (innermode)) + if (mode == GET_MODE_2XWIDER_MODE (innermode) + && TREE_CODE (treeop0) != INTEGER_CST) { if (optab_handler (this_optab, mode) != CODE_FOR_nothing) { |