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| author | Geoff Keating <geoffk@cygnus.com> | 2000-06-23 20:05:55 +0000 |
|---|---|---|
| committer | Geoffrey Keating <geoffk@gcc.gnu.org> | 2000-06-23 20:05:55 +0000 |
| commit | 3e0abe15d14d78cd9b00e422082178a69a2fa272 (patch) | |
| tree | f7d46e1f2a630caf82a788c880e071b187d02dab /gcc | |
| parent | 56e3dd2cea5979ccedbb18968098f07ffb6b5f95 (diff) | |
| download | gcc-3e0abe15d14d78cd9b00e422082178a69a2fa272.zip gcc-3e0abe15d14d78cd9b00e422082178a69a2fa272.tar.gz gcc-3e0abe15d14d78cd9b00e422082178a69a2fa272.tar.bz2 | |
alias.c (fixed_scalar_and_varying_struct_p): Don't examine struct vs.
* alias.c (fixed_scalar_and_varying_struct_p): Don't examine
struct vs. scalar-ness when -fno-strict-aliasing.
and a test case to test it, gcc.dg/20000623-1.c.
From-SVN: r34668
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/alias.c | 3 | ||||
| -rw-r--r-- | gcc/testsuite/ChangeLog | 4 | ||||
| -rw-r--r-- | gcc/testsuite/gcc.dg/20000623-1.c | 17 |
4 files changed, 29 insertions, 0 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 78d3f0d..21e230c 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,8 @@ +2000-06-23 Geoffrey Keating <geoffk@cygnus.com> + + * alias.c (fixed_scalar_and_varying_struct_p): Don't examine + struct vs. scalar-ness when -fno-strict-aliasing. + 2000-06-23 Nathan Sidwell <nathan@codesourcery.com> * cpplib.c (struct pragma_entry): New structure. diff --git a/gcc/alias.c b/gcc/alias.c index 07f8701..55cc212 100644 --- a/gcc/alias.c +++ b/gcc/alias.c @@ -1523,6 +1523,9 @@ fixed_scalar_and_varying_struct_p (mem1, mem2, mem1_addr, mem2_addr, varies_p) rtx mem1_addr, mem2_addr; int (*varies_p) PARAMS ((rtx)); { + if (! flag_strict_aliasing) + return NULL_RTX; + if (MEM_SCALAR_P (mem1) && MEM_IN_STRUCT_P (mem2) && !varies_p (mem1_addr) && varies_p (mem2_addr)) /* MEM1 is a scalar at a fixed address; MEM2 is a struct at a diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog index b3ad82b..5b7babe 100644 --- a/gcc/testsuite/ChangeLog +++ b/gcc/testsuite/ChangeLog @@ -1,3 +1,7 @@ +2000-06-23 Geoffrey Keating <geoffk@cygnus.com> + + * gcc.dg/20000623-1.c: New test. + 2000-06-22 Jakub Jelinek <jakub@redhat.com> * gcc.c-torture/execute/20000622-1.c: New test. diff --git a/gcc/testsuite/gcc.dg/20000623-1.c b/gcc/testsuite/gcc.dg/20000623-1.c new file mode 100644 index 0000000..0a5cd248 --- /dev/null +++ b/gcc/testsuite/gcc.dg/20000623-1.c @@ -0,0 +1,17 @@ +/* { dg-do run } */ +/* { dg-options "-O3 -fno-strict-aliasing" } */ + +struct foos { int l; }; +int foo; +static struct foos *getfoo(void); +int main (void) +{ + struct foos *f = getfoo(); + f->l = 1; + foo = 2; + if (f->l == 1) + abort(); + exit(0); +} +static struct foos *getfoo(void) +{ return (struct foos *)&foo; } |