Commit 456dc6d6 authored by's avatar
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SPARC NCG: HpLim is now always stored on the stack, not in a register

   This fixes the out of memory errors we were getting on sparc
   after the following patch:

     Fri Mar 13 03:45:16 PDT 2009  Simon Marlow <>
     * Instead of a separate context-switch flag, set HpLim to zero
     Ignore-this: 6c5bbe1ce2c5ef551efe98f288483b0
     This reduces the latency between a context-switch being triggered and
     the thread returning to the scheduler, which in turn should reduce the
     cost of the GC barrier when there are many cores. 
parent c0778bd3
......@@ -188,12 +188,14 @@ freeReg regno
-- %l6(r22) - %l7(r23) are allocable --------------
-- %i0(r24) - %i5(r29)
-- are STG regs Sp, Base, SpLim, Hp, HpLim, R6
-- are STG regs Sp, Base, SpLim, Hp, R6
24 -> fastBool False
25 -> fastBool False
26 -> fastBool False
27 -> fastBool False
28 -> fastBool False
-- %i5(r28) is allocable --------------------------
29 -> fastBool False
-- %i6(r30)
......@@ -263,7 +265,6 @@ globalRegMaybe gg
Sp -> Just (RealReg 24) -- %i0
SpLim -> Just (RealReg 26) -- %i2
Hp -> Just (RealReg 27) -- %i3
HpLim -> Just (RealReg 28) -- %i4
BaseReg -> Just (RealReg 25) -- %i1
......@@ -543,6 +543,10 @@
/* -----------------------------------------------------------------------------
The Sun SPARC register mapping
!! IMPORTANT: if you change this register mapping you must also update
compiler/nativeGen/SPARC/Regs.hs. That file handles the
mapping for the NCG. This one only affects via-c code.
The SPARC register (window) story: Remember, within the Haskell
Threaded World, we essentially ``shut down'' the register-window
mechanism---the window doesn't move at all while in this World. It
......@@ -590,11 +594,11 @@
%i1 Base
%i2 SpLim
%i3 Hp
%i4 alloc
%i5 R6
%i6 C frame ptr
%i7 C ret addr
The paired nature of the floating point registers causes complications for
the native code generator. For convenience, we pretend that the first 22
fp regs %f0 .. %f21 are actually 11 double regs, and the remaining 10 are
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