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| author | Russell King <rmk@dyn-67.arm.linux.org.uk> | 2005-06-29 23:01:02 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2005-06-29 23:01:02 +0100 |
| commit | 438a76167959061e371025f727fabec2ad9e70a7 (patch) | |
| tree | 47991373507725b1307ab084a7d7bda5dd9ee1be /arch/arm/vfp/vfpsingle.c | |
| parent | b3402cf50efead37dd9553b90fbf1486e09fb78e (diff) | |
| download | linux-stable-438a76167959061e371025f727fabec2ad9e70a7.tar.gz linux-stable-438a76167959061e371025f727fabec2ad9e70a7.tar.bz2 linux-stable-438a76167959061e371025f727fabec2ad9e70a7.zip | |
[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>
Diffstat (limited to 'arch/arm/vfp/vfpsingle.c')
| -rw-r--r-- | arch/arm/vfp/vfpsingle.c | 14 |
1 files changed, 12 insertions, 2 deletions
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); |