Commit 3b041227 authored by Takashi YOSHII's avatar Takashi YOSHII Committed by Paul Mundt

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: default avatarTakashi YOSHII <yoshii.takashi@renesas.com>
Signed-off-by: default avatarPaul Mundt <lethal@linux-sh.org>
parent 1fdae0e5
...@@ -10,12 +10,13 @@ lib-y += movmem.o ashldi3.o ashrdi3.o lshrdi3.o \ ...@@ -10,12 +10,13 @@ lib-y += movmem.o ashldi3.o ashrdi3.o lshrdi3.o \
ashlsi3.o ashrsi3.o ashiftrt.o lshrsi3.o \ ashlsi3.o ashrsi3.o ashiftrt.o lshrsi3.o \
udiv_qrnnd.o udiv_qrnnd.o
udivsi3-y := udivsi3-Os.o udivsi3-y := udivsi3_i4i-Os.o
ifneq ($(CONFIG_CC_OPTIMIZE_FOR_SIZE),y) ifneq ($(CONFIG_CC_OPTIMIZE_FOR_SIZE),y)
udivsi3-$(CONFIG_CPU_SH3) := udivsi3.o udivsi3-$(CONFIG_CPU_SH3) := udivsi3_i4i.o
udivsi3-$(CONFIG_CPU_SH4) := udivsi3.o udivsi3-$(CONFIG_CPU_SH4) := udivsi3_i4i.o
endif endif
udivsi3-y += udivsi3.o
obj-y += io.o obj-y += io.o
......
This diff is collapsed.
...@@ -41,9 +41,7 @@ Boston, MA 02110-1301, USA. */ ...@@ -41,9 +41,7 @@ Boston, MA 02110-1301, USA. */
.balign 4 .balign 4
.global __udivsi3_i4i .global __udivsi3_i4i
.global __udivsi3_i4 .global __udivsi3_i4
.global __udivsi3
.set __udivsi3_i4, __udivsi3_i4i .set __udivsi3_i4, __udivsi3_i4i
.set __udivsi3, __udivsi3_i4i
.type __udivsi3_i4i, @function .type __udivsi3_i4i, @function
.type __sdivsi3_i4i, @function .type __sdivsi3_i4i, @function
__udivsi3_i4i: __udivsi3_i4i:
......
This diff is collapsed.
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment