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[PowerPC] Flow oversized lines for r235309 

llvm-svn: 235310
This commit is contained in:
Bill Schmidt 2015-04-20 15:58:46 +00:00
parent 1962f709c7
commit 6779075c44
1 changed files with 20 additions and 6 deletions
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26
llvm/lib/Target/PowerPC/README_ALTIVEC.txt
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@ -316,14 +316,28 @@ a single target type. This should probably be addressed in the PPCISelDAGToDAG
//===----------------------------------------------------------------------===// //===----------------------------------------------------------------------===//
Currently EXTRACT_VECTOR_ELT and INSERT_VECTOR_ELT are type-legal only for v2f64 with VSX available. We should create custom lowering support for the other vector types. Without this support, we generate sequences with load-hit-store hazards. Currently EXTRACT_VECTOR_ELT and INSERT_VECTOR_ELT are type-legal only
for v2f64 with VSX available. We should create custom lowering
support for the other vector types. Without this support, we generate
sequences with load-hit-store hazards.
v4f32 can be supported with VSX by shifting the correct element into big-endian lane 0, using xscvspdpn to produce a double-precision representation of the single-precision value in big-endian double-precision lane 0, and reinterpreting lane 0 as an FPR or vector-scalar register. v4f32 can be supported with VSX by shifting the correct element into
big-endian lane 0, using xscvspdpn to produce a double-precision
representation of the single-precision value in big-endian
double-precision lane 0, and reinterpreting lane 0 as an FPR or
vector-scalar register.
v2i64 can be supported with VSX and P8Vector in the same manner as v2f64, followed by a direct move to a GPR. v2i64 can be supported with VSX and P8Vector in the same manner as
v2f64, followed by a direct move to a GPR.
v4i32 can be supported with VSX and P8Vector by shifting the correct element into big-endian lane 1, using a direct move to a GPR, and sign-extending the 32-bit result to 64 bits. v4i32 can be supported with VSX and P8Vector by shifting the correct
element into big-endian lane 1, using a direct move to a GPR, and
sign-extending the 32-bit result to 64 bits.
v8i16 can be supported with VSX and P8Vector by shifting the correct element into big-endian lane 3, using a direct move to a GPR, and sign-extending the 16-bit result to 64 bits. v8i16 can be supported with VSX and P8Vector by shifting the correct
element into big-endian lane 3, using a direct move to a GPR, and
sign-extending the 16-bit result to 64 bits.
v16i8 can be supported with VSX and P8Vector by shifting the correct element into big-endian lane 7, using a direct move to a GPR, and sign-extending the 8-bit result to 64 bits. v16i8 can be supported with VSX and P8Vector by shifting the correct
element into big-endian lane 7, using a direct move to a GPR, and
sign-extending the 8-bit result to 64 bits.