diff options
| author | Arnold Schwaighofer <aschwaighofer@apple.com> | 2013-02-19 15:27:05 +0000 |
|---|---|---|
| committer | Arnold Schwaighofer <aschwaighofer@apple.com> | 2013-02-19 15:27:05 +0000 |
| commit | e5083442b26266eeaf2b3675d12e3d78336ad4ae (patch) | |
| tree | 773e55cb5c2439cdba632c8190ee9960bd3c4d2b /llvm/lib | |
| parent | d4409e2cecc376b7226e125fa2bbf9005649e2e3 (diff) | |
| download | bcm5719-llvm-e5083442b26266eeaf2b3675d12e3d78336ad4ae.tar.gz bcm5719-llvm-e5083442b26266eeaf2b3675d12e3d78336ad4ae.zip | |
ARM NEON: Merge a f32 bitcast of a v2i32 extractelt
A vectorized sitfp on doubles will get scalarized to a sequence of an
extract_element of <2 x i32>, a bitcast to f32 and a sitofp.
Due to the the extract_element, and the bitcast we will uneccessarily generate
moves between scalar and vector registers.
The patch fixes this by using a COPY_TO_REGCLASS and a EXTRACT_SUBREG to extract
the element from the vector instead.
radar://13191881
llvm-svn: 175520
Diffstat (limited to 'llvm/lib')
| -rw-r--r-- | llvm/lib/Target/ARM/ARMInstrNEON.td | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/llvm/lib/Target/ARM/ARMInstrNEON.td b/llvm/lib/Target/ARM/ARMInstrNEON.td index 901ff64a863..9f68c220777 100644 --- a/llvm/lib/Target/ARM/ARMInstrNEON.td +++ b/llvm/lib/Target/ARM/ARMInstrNEON.td @@ -5745,6 +5745,12 @@ def : Pat<(v2f64 (bitconvert (v8i16 QPR:$src))), (v2f64 QPR:$src)>; def : Pat<(v2f64 (bitconvert (v16i8 QPR:$src))), (v2f64 QPR:$src)>; def : Pat<(v2f64 (bitconvert (v4f32 QPR:$src))), (v2f64 QPR:$src)>; +// Fold extracting an element out of a v2i32 into a vfp register. +def : Pat<(f32 (bitconvert (i32 (extractelt (v2i32 DPR:$src), imm:$lane)))), + (f32 (EXTRACT_SUBREG + (v2f32 (COPY_TO_REGCLASS (v2i32 DPR:$src), DPR)), + (SSubReg_f32_reg imm:$lane)))>; + // Vector lengthening move with load, matching extending loads. // extload, zextload and sextload for a standard lengthening load. Example: |
