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| author | Roger Sayle <roger@eyesopen.com> | 2006-03-16 16:34:05 +0000 |
|---|---|---|
| committer | Roger Sayle <sayle@gcc.gnu.org> | 2006-03-16 16:34:05 +0000 |
| commit | a47564c87c482e932230f440463c9c1a962e66d8 (patch) | |
| tree | a2a57c56bccf00dd8cdef7eec61b9feab32f21c8 | |
| parent | 349f4ea14a4b563b86ef48a3f4dde6643ae91226 (diff) | |
| download | gcc-a47564c87c482e932230f440463c9c1a962e66d8.zip gcc-a47564c87c482e932230f440463c9c1a962e66d8.tar.gz gcc-a47564c87c482e932230f440463c9c1a962e66d8.tar.bz2 | |
re PR middle-end/21781 (real.c incorrectly values zero with a large exponent)
PR middle-end/21781
* real.c (real_from_string): If the mantissa is zero, don't bother
parsing the exponent as the result should always be zero.
* gcc.dg/real-const-1.c: New test case.
From-SVN: r112136
| -rw-r--r-- | gcc/ChangeLog | 6 | ||||
| -rw-r--r-- | gcc/real.c | 9 | ||||
| -rw-r--r-- | gcc/testsuite/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/testsuite/gcc.dg/real-const-1.c | 4 |
4 files changed, 24 insertions, 0 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index b7870e3..3dac824 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,9 @@ +2006-03-16 Roger Sayle <roger@eyesopen.com> + + PR middle-end/21781 + * real.c (real_from_string): If the mantissa is zero, don't bother + parsing the exponent as the result should always be zero. + 2006-03-16 Andreas Krebbel <krebbel1@de.ibm.com> * simplify-rtx.c (simplify_plus_minus): Simplify within CONST terms. @@ -1862,6 +1862,11 @@ real_from_string (REAL_VALUE_TYPE *r, const char *str) str++; } } + + /* If the mantissa is zero, ignore the exponent. */ + if (!cmp_significand_0 (r)) + goto underflow; + if (*str == 'p' || *str == 'P') { bool exp_neg = false; @@ -1934,6 +1939,10 @@ real_from_string (REAL_VALUE_TYPE *r, const char *str) } } + /* If the mantissa is zero, ignore the exponent. */ + if (r->cl == rvc_zero) + goto underflow; + if (*str == 'e' || *str == 'E') { bool exp_neg = false; diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog index 6b093ac..90dc700 100644 --- a/gcc/testsuite/ChangeLog +++ b/gcc/testsuite/ChangeLog @@ -1,3 +1,8 @@ +2006-03-16 Roger Sayle <roger@eyesopen.com> + + PR middle-end/21781 + * gcc.dg/real-const-1.c: New test case. + 2006-03-15 Geoffrey Keating <geoffk@apple.com> * g++.old-deja/g++.other/init18.C: New. diff --git a/gcc/testsuite/gcc.dg/real-const-1.c b/gcc/testsuite/gcc.dg/real-const-1.c new file mode 100644 index 0000000..3e2bbfd --- /dev/null +++ b/gcc/testsuite/gcc.dg/real-const-1.c @@ -0,0 +1,4 @@ +/* PR middle-end/21781. */ +/* { dg-do compile } */ + +int f[.0e200000000 == 0?1:-1]; |