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| author | David Daney <ddaney@caviumnetworks.com> | 2009-06-11 23:55:45 +0000 |
|---|---|---|
| committer | David Daney <daney@gcc.gnu.org> | 2009-06-11 23:55:45 +0000 |
| commit | 468059bcbb8efdb31fd90369dc2ed122126413fe (patch) | |
| tree | 33e26cb48c7e5455995d1edba975d67cf78cad99 /gcc/testsuite | |
| parent | f43def61eaf4f2e1f73c5af6ad806955b8f09949 (diff) | |
| download | gcc-468059bcbb8efdb31fd90369dc2ed122126413fe.zip gcc-468059bcbb8efdb31fd90369dc2ed122126413fe.tar.gz gcc-468059bcbb8efdb31fd90369dc2ed122126413fe.tar.bz2 | |
re PR c/39252 (Request new feature __builtin_unreachable ())
2009-06-11 David Daney <ddaney@caviumnetworks.com>
PR c/39252
* doc/extend.texi ( __builtin_unreachable): Document new builtin.
* builtins.c (expand_builtin_unreachable): New function.
(expand_builtin): Handle BUILT_IN_UNREACHABLE case.
* builtins.def (BUILT_IN_UNREACHABLE): Add new builtin.
* cfgcleanup.c (try_optimize_cfg): Delete empty blocks with no
successors.
* cfgrtl.c (rtl_verify_flow_info): Handle empty blocks when
searching for missing barriers.
2009-06-11 David Daney <ddaney@caviumnetworks.com>
PR c/39252
* gcc.dg/builtin-unreachable-1.c: New test.
* gcc.dg/builtin-unreachable-2.c: Same.
From-SVN: r148403
Diffstat (limited to 'gcc/testsuite')
| -rw-r--r-- | gcc/testsuite/ChangeLog | 6 | ||||
| -rw-r--r-- | gcc/testsuite/gcc.dg/builtin-unreachable-1.c | 17 | ||||
| -rw-r--r-- | gcc/testsuite/gcc.dg/builtin-unreachable-2.c | 20 |
3 files changed, 43 insertions, 0 deletions
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog index d49243f..8d1a113 100644 --- a/gcc/testsuite/ChangeLog +++ b/gcc/testsuite/ChangeLog @@ -1,3 +1,9 @@ +2009-06-11 David Daney <ddaney@caviumnetworks.com> + + PR c/39252 + * gcc.dg/builtin-unreachable-1.c: New test. + * gcc.dg/builtin-unreachable-2.c: Same. + 2009-06-11 Paul Thomas <pault@gcc.gnu.org> PR fortran/40402 diff --git a/gcc/testsuite/gcc.dg/builtin-unreachable-1.c b/gcc/testsuite/gcc.dg/builtin-unreachable-1.c new file mode 100644 index 0000000..165da3f --- /dev/null +++ b/gcc/testsuite/gcc.dg/builtin-unreachable-1.c @@ -0,0 +1,17 @@ +/* Check that __builtin_unreachable() prevents the 'control reaches + end of non-void function' diagnostic. */ +/* { dg-do compile } */ +/* { dg-options "-O2 -Wreturn-type" } */ +int +f(int a, int b) +{ + if (a) + { + return b; + } + else + { + asm ("bug"); + __builtin_unreachable(); + } +} diff --git a/gcc/testsuite/gcc.dg/builtin-unreachable-2.c b/gcc/testsuite/gcc.dg/builtin-unreachable-2.c new file mode 100644 index 0000000..13bdb9f --- /dev/null +++ b/gcc/testsuite/gcc.dg/builtin-unreachable-2.c @@ -0,0 +1,20 @@ +/* Check that __builtin_unreachable() is a no-return function thus + causing the dead call to foo() to be removed. The comparison is + dead too, and should be removed. */ +/* { dg-do compile } */ +/* { dg-options "-O2 -fdump-tree-optimized -fdump-rtl-cse1" } */ +void foo (void); + +int +f (int i) +{ + if (i > 1) + __builtin_unreachable(); + if (i > 1) + foo (); + return 1; +} +/* { dg-final { scan-tree-dump-not "foo" "optimized" } } */ +/* { dg-final { scan-rtl-dump-not "\\(if_then_else" "cse1" } } */ +/* { dg-final { cleanup-tree-dump "optimized" } } */ +/* { dg-final { cleanup-rtl-dump "cse1" } } */ |