[PATCH] ARM: Fix VFP to use do_div()

VFP used __divdi3 64-bit division needlessly.  Convert it to use
our 64-bit by 32-bit division instead.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

3 files changed, 27 insertions, 4 deletions

diff --git a/arch/arm/vfp/vfp.h b/arch/arm/vfp/vfp.h
index 55a02bc994a3..4b97950984e9 100644
--- a/arch/arm/vfp/vfp.h
+++ b/arch/arm/vfp/vfp.h
@@ -117,7 +117,13 @@ static inline u64 vfp_estimate_div128to64(u64 nh, u64 nl, u64 m)
         if (nh >= m)
                 return ~0ULL;
         mh = m >> 32;
-        z = (mh << 32 <= nh) ? 0xffffffff00000000ULL : (nh / mh) << 32;
+        if (mh << 32 <= nh) {
+                z = 0xffffffff00000000ULL;
+        } else {
+                z = nh;
+                do_div(z, mh);
+                z <<= 32;
+        }
         mul64to128(&termh, &terml, m, z);
         sub128(&remh, &reml, nh, nl, termh, terml);
         ml = m << 32;
@@ -126,7 +132,12 @@ static inline u64 vfp_estimate_div128to64(u64 nh, u64 nl, u64 m)
                 add128(&remh, &reml, remh, reml, mh, ml);
         }
         remh = (remh << 32) | (reml >> 32);
-        z |= (mh << 32 <= remh) ? 0xffffffff : remh / mh;
+        if (mh << 32 <= remh) {
+                z |= 0xffffffff;
+        } else {
+                do_div(remh, mh);
+                z |= remh;
+        }
         return z;
 }
 
diff --git a/arch/arm/vfp/vfpdouble.c b/arch/arm/vfp/vfpdouble.c
index fa3053e84db5..b801cd66b6ea 100644
--- a/arch/arm/vfp/vfpdouble.c
+++ b/arch/arm/vfp/vfpdouble.c
@@ -32,6 +32,8 @@
  */
 #include <linux/kernel.h>
 #include <linux/bitops.h>
+
+#include <asm/div64.h>
 #include <asm/ptrace.h>
 #include <asm/vfp.h>
 
diff --git a/arch/arm/vfp/vfpsingle.c b/arch/arm/vfp/vfpsingle.c
index 6849fe35cb2e..14dd696ddeb1 100644
--- a/arch/arm/vfp/vfpsingle.c
+++ b/arch/arm/vfp/vfpsingle.c
@@ -32,6 +32,8 @@
  */
 #include <linux/kernel.h>
 #include <linux/bitops.h>
+
+#include <asm/div64.h>
 #include <asm/ptrace.h>
 #include <asm/vfp.h>
 
@@ -303,7 +305,11 @@ u32 vfp_estimate_sqrt_significand(u32 exponent, u32 significand)
                 if (z <= a)
                         return (s32)a >> 1;
         }
-        return (u32)(((u64)a << 31) / z) + (z >> 1);
+        {
+                u64 v = (u64)a << 31;
+                do_div(v, z);
+                return v + (z >> 1);
+        }
 }
 
 static u32 vfp_single_fsqrt(int sd, int unused, s32 m, u32 fpscr)
@@ -1107,7 +1113,11 @@ static u32 vfp_single_fdiv(int sd, int sn, s32 m, u32 fpscr)
                 vsn.significand >>= 1;
                 vsd.exponent++;
         }
-        vsd.significand = ((u64)vsn.significand << 32) / vsm.significand;
+        {
+                u64 significand = (u64)vsn.significand << 32;
+                do_div(significand, vsm.significand);
+                vsd.significand = significand;
+        }
         if ((vsd.significand & 0x3f) == 0)
                 vsd.significand |= ((u64)vsm.significand * vsd.significand != (u64)vsn.significand << 32);