Re: [linuxsh-dev] Lazy FPU switching

[NIIBE Y. <gn...@ch...>]

Philipp Rumpf writes:
 > On Sat, Nov 11, 2000 at 11:34:48AM +0900, NIIBE Yutaka wrote:
 > > With new GCC, we have the flag -m4-nofpu, I will introduce this flag
 > > for SH-4 kernel to avoid using FPU for division.
 > 
 > That is definitely the right thing to do

Currently, -m4-nofpu doesn't works well.  We need following patch for GCC.

--- gcc-sh-linux-20001002/gcc/config/sh/linux.h~	Tue Nov  7 18:12:20 2000
+++ gcc-sh-linux-20001002/gcc/config/sh/linux.h	Sat Nov 11 14:57:43 2000
@@ -43,9 +43,9 @@
 #define CPP_SPEC \
   "%{mb:-D__BIG_ENDIAN__} \
    %{!mb:-D__LITTLE_ENDIAN__} \
-   %{m3e:-D__SH3E__} \
    %{m4:-D__SH4__} \
-   %{!m3e:%{!m4:-D__SH3__ -D__sh3__}} \
+   %{!m4:%{m4-nofpu:-D__SH4__ -D__SH4_NOFPU__}} \
+   %{!m4:%{!m4-nofpu:-D__SH3__ -D__sh3__}} \
    %{fPIC:-D__PIC__ -D__pic__} \
    %{fpic:-D__PIC__ -D__pic__} \
    %{posix:-D_POSIX_SOURCE} \
@@ -59,11 +59,11 @@
 
 #undef CC1_SPEC
 #define CC1_SPEC \
-  "-musermode %{!mb:-ml} %{!m3e:%{!m4:-m3}}"
+  "-musermode %{!mb:-ml} %{!m4:%{!m4-nofpu:-m3}}"
 
 #undef CC1PLUS_SPEC
 #define CC1PLUS_SPEC \
-  "-musermode %{!mb:-ml} %{!m3e:%{!m4:-m3}}"
+  "-musermode %{!mb:-ml} %{!m4:%{!m4-nofpu:-m3}}"
 
 #undef LINK_SPEC
 #define LINK_SPEC \
--