diff options
| -rw-r--r-- | gcc/ChangeLog | 7 | ||||
| -rw-r--r-- | gcc/real.c | 13 |
2 files changed, 19 insertions, 1 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index b59539f3240..ca9f3660c27 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,10 @@ +2011-02-27 Jakub Jelinek <jakub@redhat.com> + + PR middle-end/47903 + * real.c (real_arithmetic) <case PLUS_EXPR, MINUS_EXPR, + MULT_EXPR, RDIV_EXPR>: Clear padding bits in *r first if + r isn't op0 nor op1. + 2011-02-23 Georg-Johann Lay <avr@gjlay.de> * config/avr/avr.md: Remove magic comment for emacs. diff --git a/gcc/real.c b/gcc/real.c index 4318586110a..6d3b4356d23 100644 --- a/gcc/real.c +++ b/gcc/real.c @@ -1,6 +1,7 @@ /* real.c - software floating point emulation. Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2002, - 2003, 2004, 2005, 2007, 2008, 2009, 2010 Free Software Foundation, Inc. + 2003, 2004, 2005, 2007, 2008, 2009, 2010, 2011 + Free Software Foundation, Inc. Contributed by Stephen L. Moshier (moshier@world.std.com). Re-written by Richard Henderson <rth@redhat.com> @@ -1009,15 +1010,25 @@ real_arithmetic (REAL_VALUE_TYPE *r, int icode, const REAL_VALUE_TYPE *op0, switch (code) { case PLUS_EXPR: + /* Clear any padding areas in *r if it isn't equal to one of the + operands so that we can later do bitwise comparisons later on. */ + if (r != op0 && r != op1) + memset (r, '\0', sizeof (*r)); return do_add (r, op0, op1, 0); case MINUS_EXPR: + if (r != op0 && r != op1) + memset (r, '\0', sizeof (*r)); return do_add (r, op0, op1, 1); case MULT_EXPR: + if (r != op0 && r != op1) + memset (r, '\0', sizeof (*r)); return do_multiply (r, op0, op1); case RDIV_EXPR: + if (r != op0 && r != op1) + memset (r, '\0', sizeof (*r)); return do_divide (r, op0, op1); case MIN_EXPR: |