flow.c (life_analysis): Do not conside the stack pointer live at the end of a function if...

        * flow.c (life_analysis): Do not conside the stack pointer live at
        the end of a function if the fucntio ncalls alloca.
        (mark_used_regs): Similarly.

From-SVN: r17839

gcc/ChangeLog

+Wed Feb 11 01:17:39 1998  Jeffrey A Law  (law@cygnus.com)
+
+	* flow.c (life_analysis): Do not conside the stack pointer live at
+	the end of a function if the fucntio ncalls alloca.
+	(mark_used_regs): Similarly.
+
 1998-02-10  John F Carr  <jfc@mit.edu>
 
 	* config/sparc/sparc.md (movdi_v8plus): Output stx on alternative

gcc/flow.c

@@ -1094,7 +1094,9 @@ life_analysis (f, nregs)
   if (n_basic_blocks > 0)
 #ifdef EXIT_IGNORE_STACK
     if (! EXIT_IGNORE_STACK
-	|| (! FRAME_POINTER_REQUIRED && flag_omit_frame_pointer))
+	|| (! FRAME_POINTER_REQUIRED
+	    && ! current_function_calls_alloca
+	    && flag_omit_frame_pointer))
 #endif
       {
 	/* If exiting needs the right stack value,
@@ -2656,7 +2658,9 @@ mark_used_regs (needed, live, x, final, insn)
 
 #ifdef EXIT_IGNORE_STACK
       if (! EXIT_IGNORE_STACK
-	  || (! FRAME_POINTER_REQUIRED && flag_omit_frame_pointer))
+	  || (! FRAME_POINTER_REQUIRED
+	      && ! current_function_calls_alloca
+	      && flag_omit_frame_pointer))
 #endif
 	SET_REGNO_REG_SET (live, STACK_POINTER_REGNUM);