diff options
Diffstat (limited to 'gcc')
| -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--) |