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8 Commits

Author SHA1 Message Date
Robert Lougher 7d9084ffa1 Teach the DAGCombiner how to fold concat_vector nodes when the input is two 
BUILD_VECTOR nodes, e.g.:

(concat_vectors (BUILD_VECTOR a1, a2, a3, a4), (BUILD_VECTOR b1, b2, b3, b4))
->
(BUILD_VECTOR a1, a2, a3, a4, b1, b2, b3, b4)

This fixes an issue with AVX, where a sequence was not recognized as a 256-bit
vbroadcast due to the concat_vectors.

llvm-svn: 201158
 2014-02-11 15:42:46 +00:00
Nadav Rotem 15946e50c1 AVX2: Add an additional broadcast idiom. 
llvm-svn: 156540
 2012-05-10 12:39:13 +00:00
Nadav Rotem b86a3fb8d0 Generate AVX/AVX2 shuffles even when there is a memory op somewhere else in the program. 
Starting r155461 we are able to select patterns for vbroadcast even when the load op is used by other users.

Fix PR11900.

llvm-svn: 156539
 2012-05-10 12:22:05 +00:00
Nadav Rotem 82609df647 AVX2: Build splat vectors by broadcasting a scalar from the constant pool. 
Previously we used three instructions to broadcast an immediate value into a
vector register.
On Sandybridge we continue to load the broadcasted value from the constant pool.

llvm-svn: 154284
 2012-04-08 12:54:54 +00:00
Craig Topper 430f3f1bd6 Fix a crash in AVX2 when trying to broadcast a double into a 128-bit vector. There is no vbroadcastsd xmm, but we do need to support 64-bit integers broadcasted into xmm. Also factor the AVX check into the isVectorBroadcast function. This makes more sense since the AVX2 check was already inside. 
llvm-svn: 147844
 2012-01-10 08:23:59 +00:00
Nadav Rotem 37010002f2 AVX: Add support for vbroadcast from BUILD_VECTOR and refactor some of the vbroadcast code. 
llvm-svn: 144720
 2011-11-15 22:50:37 +00:00
Bruno Cardoso Lopes f61d1c072e Fix vbroadcast matching logic to early unmatch if the node doesn't have 
only one use. Fix PR10825.

llvm-svn: 138951
 2011-09-01 18:15:06 +00:00
Bruno Cardoso Lopes be5e987379 Introduce matching patterns for vbroadcast AVX instruction. The idea is to 
match splats in the form (splat (scalar_to_vector (load ...))) whenever
the load can be folded. All the logic and instruction emission is
working but because of PR8156, there are no ways to match loads, cause
they can never be folded for splats. Thus, the tests are XFAILed, but
I've tested and exercised all the logic using a relaxed version for
checking the foldable loads, as if the bug was already fixed. This
should work out of the box once PR8156 gets fixed since MayFoldLoad will
work as expected.

llvm-svn: 137810
 2011-08-17 02:29:19 +00:00