Arnold Schwaighofer c46e2df74c DAGCombiner: Fold pointless truncate, bitcast, buildvector series ...

(2xi32) (truncate ((2xi64) bitcast (buildvector i32 a, i32 x, i32 b, i32 y)))
can be folded into a (2xi32) (buildvector i32 a, i32 b).

Such a DAG would cause uneccessary vdup instructions followed by vmovn
instructions.

We generate this code on ARM NEON for a setcc olt, 2xf64, 2xf64. For example, in
the vectorized version of the code below.

double A[N];
double B[N];

void test_double_compare_to_double() {
  int i;
  for(i=0;i<N;i++)
    A[i] = (double)(A[i] < B[i]);
}

radar://13191881

Fixes bug 15283.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@175670 91177308-0d34-0410-b5e6-96231b3b80d8

2013-02-20 21:33:32 +00:00

..

Analysis

Teach the DataLayout aware constant folder to be much more aggressive towards

2013-02-14 03:23:37 +00:00

Archive

Move all of the header files which are involved in modelling the LLVM IR

2013-01-02 11:36:10 +00:00

AsmParser

Update comment.

2013-02-14 20:44:07 +00:00

Bitcode

Simplify code. No functionality change.

2013-02-19 09:48:30 +00:00

CodeGen

DAGCombiner: Fold pointless truncate, bitcast, buildvector series

2013-02-20 21:33:32 +00:00

DebugInfo

Make helpers static. Add missing include so LLVMInitializeObjCARCOpts gets C linkage.

2013-02-15 12:30:38 +00:00

ExecutionEngine

Formatting, grammar

2013-02-20 18:24:34 +00:00

IR

Modify the LLVM assembly output so that it uses references to represent function attributes.

2013-02-20 07:21:42 +00:00

Linker

Add static cast to unsigned char whenever a character classification function is called with a signed char argument, in order to avoid assertions in Windows Debug configuration.

2013-02-12 21:21:59 +00:00

MC

clear new map and initialize new variable

2013-02-20 00:10:29 +00:00

Object

Add static cast to unsigned char whenever a character classification function is called with a signed char argument, in order to avoid assertions in Windows Debug configuration.

2013-02-12 21:21:59 +00:00

Option

Resort the #include lines in include/... and lib/... with the

2013-01-02 10:22:59 +00:00

Support

Rewrite comments.

2013-02-20 19:28:46 +00:00

TableGen

Make helpers static. Add missing include so LLVMInitializeObjCARCOpts gets C linkage.

2013-02-15 12:30:38 +00:00

Target

R600: Update for name changes from r175667.

2013-02-20 21:31:28 +00:00

Transforms

Update a comment that looks to have been accidentally deleted many moons ago.

2013-02-20 20:15:55 +00:00

CMakeLists.txt

Rename VMCore directory to IR.

2013-01-02 09:10:48 +00:00

LLVMBuild.txt

Rename VMCore directory to IR.

2013-01-02 09:10:48 +00:00

Makefile

Rename VMCore directory to IR.

2013-01-02 09:10:48 +00:00