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Tim Renouf f40707a2db [LiveIntervals] Handle moving up dead partial write Summary: In the test case, the machine scheduler moves a dead write to a subreg up into the middle of a segment of the overall reg's live range, where the segment had liveness only for other subregs in the reg. handleMoveUp created an invalid live range, causing an assert a bit later. This commit fixes it to handle that situation. The segment is split in two at the insertion point, and the part after the split, and any subsequent segments up to the old position, are changed to be defined by the moved def. V2: Better test. Subscribers: MatzeB, nhaehnle, llvm-commits Differential Revision: https://reviews.llvm.org/D43478 Change-Id: Ibc42445ddca84e79ad1f616401015d22bc63832e llvm-svn: 326087	2018-02-26 14:42:13 +00:00
..
CMakeLists.txt	…
LiveIntervalTest.cpp	[LiveIntervals] Handle moving up dead partial write	2018-02-26 14:42:13 +00:00

Tim Renouf f40707a2db [LiveIntervals] Handle moving up dead partial write

Summary:
In the test case, the machine scheduler moves a dead write to a subreg
up into the middle of a segment of the overall reg's live range, where
the segment had liveness only for other subregs in the reg.
handleMoveUp created an invalid live range, causing an assert a bit
later.

This commit fixes it to handle that situation. The segment is split in
two at the insertion point, and the part after the split, and any
subsequent segments up to the old position, are changed to be defined by
the moved def.

V2: Better test.

Subscribers: MatzeB, nhaehnle, llvm-commits

Differential Revision: https://reviews.llvm.org/D43478

Change-Id: Ibc42445ddca84e79ad1f616401015d22bc63832e
llvm-svn: 326087

2018-02-26 14:42:13 +00:00

CMakeLists.txt

…

LiveIntervalTest.cpp

[LiveIntervals] Handle moving up dead partial write

2018-02-26 14:42:13 +00:00