sh: Add plain udivsi3 (not _i4*) for gcc-4.1 and lower.
authorTakashi YOSHII <yoshii.takashi@renesas.com>
Mon, 8 Dec 2008 02:33:06 +0000 (11:33 +0900)
committerPaul Mundt <lethal@linux-sh.org>
Mon, 22 Dec 2008 09:43:53 +0000 (18:43 +0900)
commit3b041227f7ef7c7e97f205c68c6069c0c62e5204
treea860f34b268a257611415f33ea8f9df4ad188cb6
parent1fdae0e59a3fc9e391d2422ddcfbdbdec1e8f724
sh: Add plain udivsi3 (not _i4*) for gcc-4.1 and lower.

We chan't share code for udivsi3 and udivsi3_i4, because they
have a different clobber list. Copy udivsi3 from gcc-4.1.2.

As shown in arch/sh/lib/udivsi3.S (and -Os.S),

  .global __udivsi3_i4i
  .global __udivsi3_i4
  .global __udivsi3
__udivsi3_i4i:
  ...

Three symbols are sharing one code, which is actually udivsi3_i4i.
But, this results unwanted code with gcc 4.1.

In gcc, these three are treated as pseudo instructions that have
their own clobber list apart from the usual calling convention.

According to sh's machine description. The clobber list is as
follows:

 - udivsi3_i4i : t,r1,pr,mach,macl
 - udivsi3_i4  : t,r0,r1,r4,r5,pr,dr0,dr2,dr4
 - udivsi3     : t,r4,pr

The caller of udivsi3 will be left with a broken r1 and mac*.

gcc-4.1.x and older(at least to 3.4) generate udivsi3.
ST's gcc-4.1.1 seems to be OK because it has _i4i.

Signed-off-by: Takashi YOSHII <yoshii.takashi@renesas.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
arch/sh/lib/Makefile
arch/sh/lib/udivsi3-Os.S [deleted file]
arch/sh/lib/udivsi3.S
arch/sh/lib/udivsi3_i4i-Os.S [new file with mode: 0644]
arch/sh/lib/udivsi3_i4i.S [new file with mode: 0644]