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| author | Richard Henderson <rth@redhat.com> | 2001-06-24 09:09:29 -0700 |
|---|---|---|
| committer | Richard Henderson <rth@gcc.gnu.org> | 2001-06-24 09:09:29 -0700 |
| commit | c1c455a71d130dcbf413f0c9451bcc8287d24b41 (patch) | |
| tree | 072c952c07efd8ca1810f95ac5c40173d17818a7 | |
| parent | 7b8b8ade895d4483a53f1bb6ca6eba893d38e9ef (diff) | |
| download | gcc-c1c455a71d130dcbf413f0c9451bcc8287d24b41.zip gcc-c1c455a71d130dcbf413f0c9451bcc8287d24b41.tar.gz gcc-c1c455a71d130dcbf413f0c9451bcc8287d24b41.tar.bz2 | |
builtins.c (expand_builtin_expect_jump): Disable if the expression can't be re-evaluated.
* builtins.c (expand_builtin_expect_jump): Disable if the
expression can't be re-evaluated.
From-SVN: r43543
| -rw-r--r-- | gcc/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/builtins.c | 16 |
2 files changed, 21 insertions, 0 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index d0ad198..ded2942 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,8 @@ +2001-06-24 Richard Henderson <rth@redhat.com> + + * builtins.c (expand_builtin_expect_jump): Disable if the + expression can't be re-evaluated. + 2001-06-24 Nick Clifton <nickc@cambridge.redhat.com> * config/arm/arm.c (arm_compute_save_reg_mask): For FIQ interrupt diff --git a/gcc/builtins.c b/gcc/builtins.c index 3e4ef15..4fc329f 100644 --- a/gcc/builtins.c +++ b/gcc/builtins.c @@ -3304,6 +3304,22 @@ expand_builtin_expect_jump (exp, if_false_label, if_true_label) int j; int num_jumps = 0; + /* If we fail to locate an appropriate conditional jump, we'll + fall back to normal evaluation. Ensure that the expression + can be re-evaluated. */ + switch (unsafe_for_reeval (arg0)) + { + case 0: /* Safe. */ + break; + + case 1: /* Mildly unsafe. */ + arg0 = unsave_expr (arg0); + break; + + case 2: /* Wildly unsafe. */ + return NULL_RTX; + } + /* Expand the jump insns. */ start_sequence (); do_jump (arg0, if_false_label, if_true_label); |