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reg-stack.c (straighten_stack): Do nothing if the virtual stack is empty or has a single entry.

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* reg-stack.c (straighten_stack): Do nothing if the virtual stack is
        empty or has a single entry.

From-SVN: r22376
This commit is contained in:
Jeffrey A Law 1998-09-10 01:03:02 +00:00 committed by Jeff Law
parent 0c6bac90e7
commit 8feb7351f8
2 changed files with 10 additions and 0 deletions
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gcc/ChangeLog
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@ -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.

7
gcc/reg-stack.c
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@ -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--)