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| author | Jeffrey A Law <law@cygnus.com> | 1998-09-10 01:03:02 +0000 |
|---|---|---|
| committer | Jeff Law <law@gcc.gnu.org> | 1998-09-09 19:03:02 -0600 |
| commit | 8feb7351f8d66ccda98dec556b69d51f3d7aadb1 (patch) | |
| tree | 04b5cc79c2157ea596f0752fa023d8245f787941 | |
| parent | 0c6bac90e719e5d67595a9662c8ac20472eb4236 (diff) | |
| download | gcc-8feb7351f8d66ccda98dec556b69d51f3d7aadb1.zip gcc-8feb7351f8d66ccda98dec556b69d51f3d7aadb1.tar.gz gcc-8feb7351f8d66ccda98dec556b69d51f3d7aadb1.tar.bz2 | |
reg-stack.c (straighten_stack): Do nothing if the virtual stack is empty or has a single entry.
* reg-stack.c (straighten_stack): Do nothing if the virtual stack is
empty or has a single entry.
From-SVN: r22376
| -rw-r--r-- | gcc/ChangeLog | 3 | ||||
| -rw-r--r-- | gcc/reg-stack.c | 7 |
2 files changed, 10 insertions, 0 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 8f86a90..dfcb9b5 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,5 +1,8 @@ Thu Sep 10 01:38:05 1998 Jeffrey A Law (law@cygnus.com) + * reg-stack.c (straighten_stack): Do nothing if the virtual stack is + empty or has a single entry. + * toplev.c (rest_of_compilation): Open up the dump file for reg-stack before calling reg_to_stack. diff --git a/gcc/reg-stack.c b/gcc/reg-stack.c index ab400c5..a7a5fb7 100644 --- a/gcc/reg-stack.c +++ b/gcc/reg-stack.c @@ -309,6 +309,13 @@ straighten_stack (insn, regstack) struct stack_def temp_stack; int top; + /* If there is only a single register on the stack, then the stack is + already in increasing order and no reorganization is needed. + + Similarly if the stack is empty. */ + if (regstack->top <= 0) + return; + temp_stack.reg_set = regstack->reg_set; for (top = temp_stack.top = regstack->top; top >= 0; top--) |