From: Simon Marlow <marlowsd@gmail.com>
Date: Fri, 25 Jul 2008 12:29:21 +0000 (+0000)
Subject: don't steal %ebx for the GC on x86: it's also used by PIC
X-Git-Url: http://git.megacz.com/?p=ghc-hetmet.git;a=commitdiff_plain;h=2ad3ac2baca1c6fd0d69f3417fa62ae10cffcf49

don't steal %ebx for the GC on x86: it's also used by PIC
---

diff --git a/rts/sm/GCThread.h b/rts/sm/GCThread.h
index d4376f7..1b5c5d4 100644
--- a/rts/sm/GCThread.h
+++ b/rts/sm/GCThread.h
@@ -196,7 +196,9 @@ extern gc_thread **gc_threads;
 
 #define GLOBAL_REG_DECL(type,name,reg) register type name REG(reg);
 
-#if defined(REG_Base)
+#if defined(REG_Base) && !defined(i386_HOST_ARCH)
+// on i386, REG_Base is %ebx which is also used for PIC, so we don't
+// want to steal it
 
 GLOBAL_REG_DECL(gc_thread*, gct, REG_Base)
 #define DECLARE_GCT /* nothing */