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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@57940 91177308-0d34-0410-b5e6-96231b3b80d8
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Dale Johannesen 2008-10-22 00:02:32 +00:00
parent b2ab0e7471
commit 9ae0d6df51
1 changed files with 9 additions and 9 deletions
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18
lib/Target/X86/X86ISelLowering.cpp
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@ -4703,30 +4703,30 @@ SDValue X86TargetLowering::LowerUINT_TO_FP(SDValue Op, SelectionDAG &DAG) {
static const __m128i exp = { 0x4330000045300000ULL, 0 };
static const __m128d bias = { 0x1.0p84, 0x1.0p52 };
//copy ints to xmm registers
// copy ints to xmm registers
__m128i xh = _mm_cvtsi32_si128( hi );
__m128i xl = _mm_cvtsi32_si128( lo );
//combine into low half of a single xmm register
// combine into low half of a single xmm register
__m128i x = _mm_unpacklo_epi32( xh, xl );
__m128d d;
double sd;
//merge in appropriate exponents to give the integer bits the
// merge in appropriate exponents to give the integer bits the
// right magnitude
x = _mm_unpacklo_epi32( x, exp );
//subtract away the biases to deal with the IEEE-754 double precision
//implicit 1
// subtract away the biases to deal with the IEEE-754 double precision
// implicit 1
d = _mm_sub_pd( (__m128d) x, bias );
//All conversions up to here are exact. The correctly rounded result is
// All conversions up to here are exact. The correctly rounded result is
// calculated using the
//current rounding mode using the following horizontal add.
// current rounding mode using the following horizontal add.
d = _mm_add_sd( d, _mm_unpackhi_pd( d, d ) );
_mm_store_sd( &sd, d ); //since we are returning doubles in XMM, this
//store doesn't really need to be here (except maybe to zero the other
//double)
// store doesn't really need to be here (except maybe to zero the other
// double)
return sd;
}
*/