Displaying 4 results from an estimated 4 matches for "f4b".
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4b
2008 Sep 30
0
[LLVMdev] Generalizing shuffle vector
On Mon, Sep 29, 2008 at 8:11 PM, Mon Ping Wang <wangmp at apple.com> wrote:
> The problem with generating insert and extracts is that we can generate poor
> code
> %tmp16 = extractelement <4 x float> %f4b, i32 0
> %f8a = insertelement <8 x float> %f8a, float %tmp16, i32 0
> %tmp18 = extractelement <4 x float> %f4b, i32 1
> %f8c = insertelement <8 x float> %f8b, float %tmp18, i32 1
> ...
> For X86, legalize will convert each insertelement to...
2008 Sep 30
4
[LLVMdev] Generalizing shuffle vector
...ting each element in the vector and inserting each element into
a new vector. With this new form, it is more straightforward to write
and reason about
typedef __attribute__(( ext_vector_type(4) )) float float4;
typedef __attribute__(( ext_vector_type(8) )) float float8;
float8 f8;
float4 f4a, f4b, f4c;
f4a = f8.hi;
f8.hi = f4b; f8.lo = f4c;
where hi and lo represent the high half and low half of the vector.
The outgoing IR is
%f4a = shufflevector <8xf32>%f8, undef, <4xi32> <0, 1, 2, 3>
%f8 = shufflevector <4xf32>%f4b, <4xf32>%f4c, <8xi32> <0,...
2003 Jun 26
1
HELP
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2006 Mar 15
0
Samba + Cups -> PPD Options problem - 1 attachment
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