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[PATCH] Add a __ucmpdi2 implementation

To: linux-mips@linux-mips.org
Subject: [PATCH] Add a __ucmpdi2 implementation
From: Thiemo Seufer <ths@networkno.de>
Date: Tue, 1 May 2007 19:14:16 +0100
Cc: ralf@linux-mips.org
Original-recipient: rfc822;linux-mips@linux-mips.org
Sender: linux-mips-bounce@linux-mips.org
User-agent: Mutt/1.5.13 (2006-08-11)
Hello All,

this patch adds a __ucmpdi2 implementation, recent GCC SVN versions
generate calls to it from some of the FPU emulator functions.

Tested by building and booting a little endian qemu MIPS kernel.


Thiemo


Signed-off-by: Thiemo Seufer <ths@networkno.de>

diff --git a/arch/mips/lib/Makefile b/arch/mips/lib/Makefile
index d7d3b14..5dad13e 100644
--- a/arch/mips/lib/Makefile
+++ b/arch/mips/lib/Makefile
@@ -9,4 +9,4 @@ obj-y                   += iomap.o
 obj-$(CONFIG_PCI)      += iomap-pci.o
 
 # libgcc-style stuff needed in the kernel
-lib-y += ashldi3.o ashrdi3.o lshrdi3.o
+lib-y += ashldi3.o ashrdi3.o lshrdi3.o ucmpdi2.o
diff --git a/arch/mips/lib/ucmpdi2.c b/arch/mips/lib/ucmpdi2.c
new file mode 100644
index 0000000..e9ff258
--- /dev/null
+++ b/arch/mips/lib/ucmpdi2.c
@@ -0,0 +1,19 @@
+#include <linux/module.h>
+
+#include "libgcc.h"
+
+word_type __ucmpdi2 (unsigned long a, unsigned long b)
+{
+       const DWunion au = {.ll = a};
+       const DWunion bu = {.ll = b};
+
+       if ((unsigned int) au.s.high < (unsigned int) bu.s.high)
+               return 0;
+       else if ((unsigned int) au.s.high > (unsigned int) bu.s.high)
+               return 2;
+       if ((unsigned int) au.s.low < (unsigned int) bu.s.low)
+               return 0;
+       else if ((unsigned int) au.s.low > (unsigned int) bu.s.low)
+               return 2;
+       return 1;
+}

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