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authorNicolas Pitre <nico@cam.org>2005-06-23 21:56:46 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2005-06-23 21:56:46 +0100
commitc1241c4c3a1507d76c7b987130f2f02f53ecc09f (patch)
tree8b34e8bd30c94c279a3cdabf8b13e05d1ef3dc77
parentbf1b8ab6f21e1adbab1abd1b4e71c35fe65dc5fe (diff)
[PATCH] ARM: 2722/1: remove reliance on udivdi3 for nwfpe
Patch from Nicolas Pitre Signed-off-by: Nicolas Pitre <nico@cam.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
-rw-r--r--arch/arm/nwfpe/softfloat-macros22
-rw-r--r--arch/arm/nwfpe/softfloat.c12
2 files changed, 28 insertions, 6 deletions
diff --git a/arch/arm/nwfpe/softfloat-macros b/arch/arm/nwfpe/softfloat-macros
index 5469989f2c5..5a060f95a58 100644
--- a/arch/arm/nwfpe/softfloat-macros
+++ b/arch/arm/nwfpe/softfloat-macros
@@ -563,8 +563,14 @@ static bits64 estimateDiv128To64( bits64 a0, bits64 a1, bits64 b )
bits64 rem0, rem1, term0, term1;
bits64 z;
if ( b <= a0 ) return LIT64( 0xFFFFFFFFFFFFFFFF );
- b0 = b>>32;
- z = ( b0<<32 <= a0 ) ? LIT64( 0xFFFFFFFF00000000 ) : ( a0 / b0 )<<32;
+ b0 = b>>32; /* hence b0 is 32 bits wide now */
+ if ( b0<<32 <= a0 ) {
+ z = LIT64( 0xFFFFFFFF00000000 );
+ } else {
+ z = a0;
+ do_div( z, b0 );
+ z <<= 32;
+ }
mul64To128( b, z, &term0, &term1 );
sub128( a0, a1, term0, term1, &rem0, &rem1 );
while ( ( (sbits64) rem0 ) < 0 ) {
@@ -573,7 +579,12 @@ static bits64 estimateDiv128To64( bits64 a0, bits64 a1, bits64 b )
add128( rem0, rem1, b0, b1, &rem0, &rem1 );
}
rem0 = ( rem0<<32 ) | ( rem1>>32 );
- z |= ( b0<<32 <= rem0 ) ? 0xFFFFFFFF : rem0 / b0;
+ if ( b0<<32 <= rem0 ) {
+ z |= 0xFFFFFFFF;
+ } else {
+ do_div( rem0, b0 );
+ z |= rem0;
+ }
return z;
}
@@ -601,6 +612,7 @@ static bits32 estimateSqrt32( int16 aExp, bits32 a )
};
int8 index;
bits32 z;
+ bits64 A;
index = ( a>>27 ) & 15;
if ( aExp & 1 ) {
@@ -614,7 +626,9 @@ static bits32 estimateSqrt32( int16 aExp, bits32 a )
z = ( 0x20000 <= z ) ? 0xFFFF8000 : ( z<<15 );
if ( z <= a ) return (bits32) ( ( (sbits32) a )>>1 );
}
- return ( (bits32) ( ( ( (bits64) a )<<31 ) / z ) ) + ( z>>1 );
+ A = ( (bits64) a )<<31;
+ do_div( A, z );
+ return ( (bits32) A ) + ( z>>1 );
}
diff --git a/arch/arm/nwfpe/softfloat.c b/arch/arm/nwfpe/softfloat.c
index 9d743ae2906..e038dd3be9b 100644
--- a/arch/arm/nwfpe/softfloat.c
+++ b/arch/arm/nwfpe/softfloat.c
@@ -28,6 +28,8 @@ this code that are retained.
===============================================================================
*/
+#include <asm/div64.h>
+
#include "fpa11.h"
//#include "milieu.h"
//#include "softfloat.h"
@@ -1331,7 +1333,11 @@ float32 float32_div( float32 a, float32 b )
aSig >>= 1;
++zExp;
}
- zSig = ( ( (bits64) aSig )<<32 ) / bSig;
+ {
+ bits64 tmp = ( (bits64) aSig )<<32;
+ do_div( tmp, bSig );
+ zSig = tmp;
+ }
if ( ( zSig & 0x3F ) == 0 ) {
zSig |= ( ( (bits64) bSig ) * zSig != ( (bits64) aSig )<<32 );
}
@@ -1397,7 +1403,9 @@ float32 float32_rem( float32 a, float32 b )
q = ( bSig <= aSig );
if ( q ) aSig -= bSig;
if ( 0 < expDiff ) {
- q = ( ( (bits64) aSig )<<32 ) / bSig;
+ bits64 tmp = ( (bits64) aSig )<<32;
+ do_div( tmp, bSig );
+ q = tmp;
q >>= 32 - expDiff;
bSig >>= 2;
aSig = ( ( aSig>>1 )<<( expDiff - 1 ) ) - bSig * q;