Juergen Ributzka f08cddcf56 Reapply [FastISel] Let the target decide first if it wants to materialize a constant (215588). ... Note: This was originally reverted to track down a buildbot error. This commit exposed a latent bug that was fixed in r215753. Therefore it is reapplied without any modifications. I run it through SPEC2k and SPEC2k6 for AArch64 and it didn't introduce any new regeressions. Original commit message: This changes the order in which FastISel tries to materialize a constant. Originally it would try to use a simple target-independent approach, which can lead to the generation of inefficient code. On X86 this would result in the use of movabsq to materialize any 64bit integer constant - even for simple and small values such as 0 and 1. Also some very funny floating-point materialization could be observed too. On AArch64 it would materialize the constant 0 in a register even the architecture has an actual "zero" register. On ARM it would generate unnecessary mov instructions or not use mvn. This change simply changes the order and always asks the target first if it likes to materialize the constant. This doesn't fix all the issues mentioned above, but it enables the targets to implement such optimizations. Related to <rdar://problem/17420988>. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216006 91177308-0d34-0410-b5e6-96231b3b80d8		2014-08-19 19:05:24 +00:00
..
AArch64	[FastISel][AArch64] Fix a few BuildMI callsites where the result register was added as an operand register.	2014-08-19 17:41:53 +00:00
ARM	Reapply [FastISel] Let the target decide first if it wants to materialize a constant (215588).	2014-08-19 19:05:24 +00:00
CPP
Generic	Use "weak alias" instead of "alias weak"	2014-07-30 22:51:54 +00:00
Hexagon	DebugInfo: Assert that any CU for which debug_loc lists are emitted, has at least one range.	2014-08-06 00:21:25 +00:00
Inputs
Mips	Fix fmul combines with constant splat vectors	2014-08-16 10:14:19 +00:00
MSP430
NVPTX
PowerPC	Reapply [FastISel] Let the target decide first if it wants to materialize a constant (215588).	2014-08-19 19:05:24 +00:00
R600	R600/SI: Move all fabs / fneg handling to patterns	2014-08-15 18:42:22 +00:00
SPARC
SystemZ
Thumb	ARM: Fix and re-enable load/store optimizer for Thumb1.	2014-08-15 17:00:30 +00:00
Thumb2	ARM: do not generate BLX instructions on Cortex-M CPUs.	2014-08-06 11:13:14 +00:00
X86	Reapply [FastISel] Let the target decide first if it wants to materialize a constant (215588).	2014-08-19 19:05:24 +00:00
XCore