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104 Commits

Author SHA1 Message Date
Dylan McKay 12109e7314 Allow a maximum of 64 bits to be returned in registers 
The rest spills to the stack

Authored by Jake Goulding

llvm-svn: 283635
 2016-10-08 01:05:09 +00:00
Dylan McKay c1ff65cf62 [AVR] Expand MULHS for all types 
Once MULHS was expanded, this exposed an issue where the condition
register was thought to be 16-bit. This caused an attempt to copy a
16-bit register to an 8-bit register.

Authored by Jake Goulding

llvm-svn: 283634
 2016-10-08 01:01:49 +00:00
Dylan McKay 309eba75b1 Revert "[RegAllocGreedy] Attempt to split unspillable live intervals" 
It was accidentally committed.

llvm-svn: 282855
 2016-09-30 14:05:15 +00:00
Dylan McKay 2a80cc688a [RegAllocGreedy] Attempt to split unspillable live intervals 
Summary:
Previously, when allocating unspillable live ranges, we would never
attempt to split. We would always bail out and try last ditch graph
recoloring.

This patch changes this by attempting to split all live intervals before
performing recoloring.

This fixes LLVM bug PR14879.

I can't add test cases for any backends other than AVR because none of
them have small enough register classes to trigger the bug.

Reviewers: qcolombet

Subscribers: MatzeB

Differential Revision: https://reviews.llvm.org/D25070

llvm-svn: 282852
 2016-09-30 13:59:20 +00:00