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| author | Jakub Jelinek <jakub@redhat.com> | 2011-02-27 20:37:35 +0100 |
|---|---|---|
| committer | Jakub Jelinek <jakub@gcc.gnu.org> | 2011-02-27 20:37:35 +0100 |
| commit | f6b439c98cc246de3e27c45a30ad5877b7ccb958 (patch) | |
| tree | eaa8c5783d5d40079e949e06d2ac1b67aee2e28f /gcc/real.c | |
| parent | 1d944f61adf5fa7f5744d0ec269e02f55b79921f (diff) | |
| download | gcc-f6b439c98cc246de3e27c45a30ad5877b7ccb958.zip gcc-f6b439c98cc246de3e27c45a30ad5877b7ccb958.tar.gz gcc-f6b439c98cc246de3e27c45a30ad5877b7ccb958.tar.bz2 | |
re PR middle-end/47903 (var-tracking.c: valgrind error)
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.
From-SVN: r170547
Diffstat (limited to 'gcc/real.c')
| -rw-r--r-- | gcc/real.c | 13 |
1 files changed, 12 insertions, 1 deletions
@@ -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: |