[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>
diff --git a/arch/arm/vfp/vfpsingle.c b/arch/arm/vfp/vfpsingle.c
index 6849fe3..14dd696 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 @@
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 @@
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);