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Chad Rosier fa8d89327f The Neon VCVT (between floating-point and fixed-point, Advanced SIMD) 
instructions can be used to match combinations of multiply/divide and VCVT 
(between floating-point and integer, Advanced SIMD).  Basically the VCVT 
immediate operand that specifies the number of fraction bits corresponds to a 
floating-point multiply or divide by the corresponding power of 2.

For example, VCVT (floating-point to fixed-point, Advanced SIMD) can replace a 
combination of VMUL and VCVT (floating-point to integer) as follows:

Example (assume d17 = <float 8.000000e+00, float 8.000000e+00>):
  vmul.f32        d16, d17, d16
  vcvt.s32.f32    d16, d16
becomes:
  vcvt.s32.f32    d16, d16, #3

Similarly, VCVT (fixed-point to floating-point, Advanced SIMD) can replace a 
combinations of VCVT (integer to floating-point) and VDIV as follows:

Example (assume d17 = <float 8.000000e+00, float 8.000000e+00>):
  vcvt.f32.s32    d16, d16
  vdiv.f32        d16, d17, d16
becomes:
  vcvt.f32.s32    d16, d16, #3

llvm-svn: 133813
 		2011-06-24 19:23:04 +00:00
..
Analysis Calculate backedge probability correctly. 2011-06-23 23:52:11 +00:00
Archive Revert PathV2 changes, as sys::fs::unique_file is not finished yet. 2011-03-01 19:50:55 +00:00
AsmParser Replace the existing forms of ConstantArray::get() with a single form 2011-06-22 09:24:39 +00:00
Bitcode Replace the existing forms of ConstantArray::get() with a single form 2011-06-22 09:24:39 +00:00
CodeGen Simplify 2011-06-24 15:50:56 +00:00
CompilerDriver Build CompilerDriver library. 2011-03-12 22:01:42 +00:00
ExecutionEngine eliminate the Type::getDescription() method, using "<<" instead. This 2011-06-18 21:18:23 +00:00
Linker Set the unnamed_addr only when we're creating a new GV in the dest module. 2011-03-29 23:31:06 +00:00
MC Fixup info for Thumb2 unconditional branch. 2011-06-24 18:48:32 +00:00
Object Revert r132910 and r132909 on behalf of Michael. They didn't build with clang. 2011-06-13 12:56:51 +00:00
Support Fix the implementation of ConstantRange::sub(ConstantRange). Patch by Xi Wang! 2011-06-22 21:13:46 +00:00
Target The Neon VCVT (between floating-point and fixed-point, Advanced SIMD) 2011-06-24 19:23:04 +00:00
Transforms PR10180: Fix a instcombine crash with FP vectors. 2011-06-23 20:40:23 +00:00
VMCore Reinstate r133513 (reverted in r133700) with an additional fix for a 2011-06-23 09:09:15 +00:00
CMakeLists.txt Build CompilerDriver library. 2011-03-12 22:01:42 +00:00
Makefile Add LLVMObject Library. 2010-11-15 03:21:41 +00:00