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3 Commits

Author SHA1 Message Date
Tim Northover
ebde5a5e49 ARM64: use hex immediates for movz/movk instructions 
Since these are mostly used in "lsl #16", "lsl #32", "lsl #48" combinations to
piece together an immediate in 16-bit chunks, hex is probably the most
appropriate format.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207635 91177308-0d34-0410-b5e6-96231b3b80d8
 2014-04-30 11:19:40 +00:00
Tim Northover
fef8e383eb ARM64: use 32-bit moves for constants where possible. 
If we know that a particular 64-bit constant has all high bits zero, then we
can rely on the fact that 32-bit ARM64 instructions automatically zero out the
high bits of an x-register. This gives the expansion logic less constraints to
satisfy and so sometimes allows it to pick better sequences.

Came up while porting test/CodeGen/AArch64/movw-consts.ll: this will allow a
32-bit MOVN to be used in @test8 soon.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@206379 91177308-0d34-0410-b5e6-96231b3b80d8
 2014-04-16 11:52:51 +00:00
Juergen Ributzka
c6a7502a80 [Constant Hoisting][ARM64] Enable constant hoisting for ARM64. 
This implements the target-hooks for ARM64 to enable constant hoisting.

This fixes <rdar://problem/14774662> and <rdar://problem/16381500>.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@205791 91177308-0d34-0410-b5e6-96231b3b80d8
 2014-04-08 20:39:59 +00:00