[pypy-svn] pypy arm-backed-float: use d15 as vfp scratch register and use it instead of temporarily pushing some register

[bivab]

Author: David Schneider <david.schneider at picle.org>
Branch: arm-backed-float
Changeset: r43473:8c20c87901d7
Date: 2011-04-19 10:41 +0200
http://bitbucket.org/pypy/pypy/changeset/8c20c87901d7/

Log:	use d15 as vfp scratch register and use it instead of temporarily
	pushing some register

diff --git a/pypy/jit/backend/arm/assembler.py b/pypy/jit/backend/arm/assembler.py
--- a/pypy/jit/backend/arm/assembler.py
+++ b/pypy/jit/backend/arm/assembler.py
@@ -388,10 +388,8 @@
             if loc.is_vfp_reg():
                 self.mc.VLDR(loc.value, r.ip.value)
             else:
-                tmpreg = r.d0
-                with saved_registers(self.mc, [], [tmpreg]):
-                    self.mc.VLDR(tmpreg.value, r.ip.value)
-                    self.mov_loc_loc(tmpreg, loc)
+                self.mc.VLDR(r.vfp_ip.value, r.ip.value)
+                self.mov_loc_loc(r.vfp_ip, loc)
 
     def _count_reg_args(self, args):
         reg_args = 0
@@ -442,9 +440,8 @@
                 self.mc.VLDR(loc.value, r.fp.value, stack_position)
             elif loc.is_stack():
                 if loc.type == FLOAT:
-                    with saved_registers(self.mc, [], [r.d0]):
-                        self.mc.VLDR(r.d0.value, r.fp.value, stack_position)
-                        self.mov_loc_loc(r.d0, loc)
+                    self.mc.VLDR(r.vfp_ip.value, r.fp.value, stack_position)
+                    self.mov_loc_loc(r.vfp_ip, loc)
                 elif loc.type == INT or loc.type == REF:
                     self.mc.LDR_ri(r.ip.value, r.fp.value, stack_position)
                     self.mov_loc_loc(r.ip, loc)

diff --git a/pypy/jit/backend/arm/registers.py b/pypy/jit/backend/arm/registers.py
--- a/pypy/jit/backend/arm/registers.py
+++ b/pypy/jit/backend/arm/registers.py
@@ -13,9 +13,10 @@
 sp = r13
 lr = r14
 pc = r15
+vfp_ip = d15
 
 all_regs = [r0, r1, r2, r3, r4, r5, r6, r7, r8, r9, r10]
-all_vfp_regs = vfpregisters
+all_vfp_regs = vfpregisters[:-1]
 
 caller_resp = [r0, r1, r2, r3]
 callee_resp = [r4, r5, r6, r7, r8, r9, r10, fp]