Commit Graph

4 Commits

Author SHA1 Message Date
Haicheng Wu faee2b71a7 [AArch64] Lower multiplication by a constant int to shl+add+shl
Lower a = b * C where C = (2^n + 1) * 2^m to

add     w0, w0, w0, lsl n
lsl     w0, w0, m

Differential Revision: https://reviews.llvm.org/D229245

llvm-svn: 287019
2016-11-15 20:16:48 +00:00
Simon Pilgrim fc4d4b251d [AARCH64] Enable AARCH64 lit tests on windows dev machines
As discussed on PR27654, this patch fixes the triples of a lot of aarch64 tests and enables lit tests on windows

This will hopefully help stop cases where windows developers break the aarch64 target

Differential Revision: https://reviews.llvm.org/D22191

llvm-svn: 275973
2016-07-19 13:35:11 +00:00
Chad Rosier 8e38f30e49 [AArch64] When combining constant mul of -3, prefer (sub x, (shl x, N)).
This change only effects codegen when the constant is -3.

llvm-svn: 231085
2015-03-03 17:31:01 +00:00
Chad Rosier e6b8761ab9 [AArch64] Convert mul x, -(pow2 +/- 1) to shift + add/sub.
The combine for mul x, pow2 +/- 1 is unchanged. Test cases for
both combines as well as mul x, pow2 have been added as well.

llvm-svn: 212044
2014-06-30 14:51:14 +00:00