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# f43b5100 20-Dec-2018 Ulrich Weigand <[email protected]>

[SystemZ] Make better use of VLDEB

We already have special code (DAG combine support for FP_ROUND)
to recognize cases where we an use a vector version of VLEDB to
perform two floating-point truncate

[SystemZ] Make better use of VLDEB

We already have special code (DAG combine support for FP_ROUND)
to recognize cases where we an use a vector version of VLEDB to
perform two floating-point truncates in parallel, but equivalent
support for VLEDB (vector floating-point extends) has been
missing so far. This patch adds corresponding DAG combine
support for FP_EXTEND.

llvm-svn: 349746

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# 49506d78 05-May-2015 Ulrich Weigand <[email protected]>

[SystemZ] Add CodeGen support for scalar f64 ops in vector registers

The z13 vector facility includes some instructions that operate only on the
high f64 in a v2f64, effectively extending the FP reg

[SystemZ] Add CodeGen support for scalar f64 ops in vector registers

The z13 vector facility includes some instructions that operate only on the
high f64 in a v2f64, effectively extending the FP register set from 16
to 32 registers. It's still better to use the old instructions if the
operands happen to fit though, since the older instructions have a shorter
encoding.

Based on a patch by Richard Sandiford.

llvm-svn: 236524

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# 80b3af7a 05-May-2015 Ulrich Weigand <[email protected]>

[SystemZ] Add CodeGen support for v4f32

The architecture doesn't really have any native v4f32 operations except
v4f32->v2f64 and v2f64->v4f32 conversions, with only half of the v4f32
elements being

[SystemZ] Add CodeGen support for v4f32

The architecture doesn't really have any native v4f32 operations except
v4f32->v2f64 and v2f64->v4f32 conversions, with only half of the v4f32
elements being used. Even so, using vector registers for <4 x float>
and scalarising individual operations is much better than generating
completely scalar code, since there's much less register pressure.
It's also more efficient to do v4f32 comparisons by extending to 2
v2f64s, comparing those, then packing the result.

This particularly helps with llvmpipe.

Based on a patch by Richard Sandiford.

llvm-svn: 236523

show more ...