From 1a97dd78fc19ca1dc0fc6d32bbba44280c4d3a65 Mon Sep 17 00:00:00 2001
From: spth <spth@4a8a32a2-be11-0410-ad9d-d568d2c75423>
Date: Sun, 30 Mar 2008 10:40:52 +0000
Subject: [PATCH 1/1] Implemented #1921450

git-svn-id: https://sdcc.svn.sourceforge.net/svnroot/sdcc/trunk/sdcc@5125 4a8a32a2-be11-0410-ad9d-d568d2c75423
---
 ChangeLog        |  4 ++++
 src/z80/ralloc.c | 14 +++++++++++---
 2 files changed, 15 insertions(+), 3 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 4367b750..01fc9e6d 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2008-03-30 Philipp Klaus Krause <pkk AT spth.de>
+	* src/z80/ralloc (serialRegAssign, allocReg, tryAllocatingRegPair):
+	  Implemented #1921450, changed some Debug messages.
+
 2008-03-30 Borut Razem <borut.razem AT siol.net>
 
 	* Small Device C Compiler 2.8.0 released
diff --git a/src/z80/ralloc.c b/src/z80/ralloc.c
index df66ab35..aebe825e 100644
--- a/src/z80/ralloc.c
+++ b/src/z80/ralloc.c
@@ -146,7 +146,7 @@ allocReg (short type)
             {
               currFunc->regsUsed = bitVectSetBit (currFunc->regsUsed, i);
             }
-          D (D_ALLOC, ("allocReg: alloced %p\n", &regsZ80[i]));
+          D (D_ALLOC, ("allocReg: alloced %s\n", regsZ80[i].name));
           return &regsZ80[i];
         }
     }
@@ -1039,11 +1039,11 @@ tryAllocatingRegPair (symbol * sym)
               currFunc->regsUsed =
                 bitVectSetBit (currFunc->regsUsed, i + 1);
             }
-          D (D_ALLOC, ("tryAllocRegPair: succeded for sym %p\n", sym));
+          D (D_ALLOC, ("tryAllocatingRegPair: succeded for sym %p\n", sym));
           return TRUE;
         }
     }
-  D (D_ALLOC, ("tryAllocRegPair: failed on sym %p\n", sym));
+  D (D_ALLOC, ("tryAllocatingRegPair: failed on sym %p\n", sym));
   return FALSE;
 }
 
@@ -1234,6 +1234,14 @@ serialRegAssign (eBBlock ** ebbs, int count)
                             break;
                         }
                     }
+                  /* Make sure we didn't allocate a register pair with bytes swapped */
+                  if(sym->nRegs == 2 && sym->regs[0] == sym->regs[1] + 1 && sym->regs[0] != &regsZ80[2])
+                  {
+			freeReg(sym->regs[0]);
+			freeReg(sym->regs[1]);
+			if(!tryAllocatingRegPair(sym))
+				wassertl(0, "Failed to swap register pair bytes back.");
+                  }
                 }
               /* if it shares registers with operands make sure
                  that they are in the same position */
-- 
2.30.2