[pypy-commit] pypy ppc-jit-backend: store frame size for malloc_slowpath in a variable

[bivab]

Author: David Schneider <david.schneider at picle.org>
Branch: ppc-jit-backend
Changeset: r52718:a194a3b4885f
Date: 2012-02-21 02:11 -0800
http://bitbucket.org/pypy/pypy/changeset/a194a3b4885f/

Log:	store frame size for malloc_slowpath in a variable

diff --git a/pypy/jit/backend/ppc/ppc_assembler.py b/pypy/jit/backend/ppc/ppc_assembler.py
--- a/pypy/jit/backend/ppc/ppc_assembler.py
+++ b/pypy/jit/backend/ppc/ppc_assembler.py
@@ -301,7 +301,10 @@
         if IS_PPC_64:
             for _ in range(6):
                 mc.write32(0)
-        mc.subi(r.SP.value, r.SP.value, BACKCHAIN_SIZE * WORD + 1*WORD)
+        frame_size = (# add space for floats later
+                    + WORD # Link Register
+                    + BACKCHAIN_SIZE * WORD)
+        mc.subi(r.SP.value, r.SP.value, frame_size)
         mc.mflr(r.SCRATCH.value)
         if IS_PPC_32:
             mc.stw(r.SCRATCH.value, r.SP.value, 0) 
@@ -329,7 +332,7 @@
  
         mc.load(r.SCRATCH.value, r.SP.value, 0) 
         mc.mtlr(r.SCRATCH.value)     # restore LR
-        mc.addi(r.SP.value, r.SP.value, BACKCHAIN_SIZE * WORD + 1*WORD) # restore old SP
+        mc.addi(r.SP.value, r.SP.value, frame_size) # restore old SP
         mc.blr()
 
         # if r3 == 0 we skip the return above and jump to the exception path