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tgsi: Enable fast high precision rsqrt.

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This commit is contained in:
Michal Krol 2008-05-02 16:12:55 +02:00
parent 17058e0746
commit 6c15a70b75
1 changed files with 0 additions and 22 deletions
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22
src/gallium/auxiliary/tgsi/exec/tgsi_sse2.c
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@ -761,20 +761,6 @@ emit_rcp (
make_xmm( xmm_src ) );
}
#if HIGH_PRECISION
static void XSTDCALL
rsqrt4f(
float *store )
{
const unsigned X = 0;
store[X + 0] = 1.0F / sqrtf( store[X + 0] );
store[X + 1] = 1.0F / sqrtf( store[X + 1] );
store[X + 2] = 1.0F / sqrtf( store[X + 2] );
store[X + 3] = 1.0F / sqrtf( store[X + 3] );
}
#endif
static void
emit_rsqrt(
struct x86_function *func,
@ -782,13 +768,6 @@ emit_rsqrt(
unsigned xmm_src )
{
#if HIGH_PRECISION
#if 1
emit_func_call_dst_src(
func,
xmm_dst,
xmm_src,
rsqrt4f );
#else
/* Although rsqrtps() and rcpps() are low precision on some/all SSE
* implementations, it is possible to improve its precision at
* fairly low cost, using a newton/raphson step, as below:
@ -817,7 +796,6 @@ emit_rsqrt(
sse_subps( func, tmp0, src );
sse_mulps( func, dst, tmp0 );
}
#endif
#else
/* On Intel CPUs at least, this is only accurate to 12 bits -- not
* good enough.