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6 Commits

Author SHA1 Message Date
Bruno Cardoso Lopes f6cf8ad4e5 Reapply: [InstCombine] Fix visitSwitchInst to use right operand types for sub cstexpr 
The visitSwitchInst generates SUB constant expressions to recompute the
switch condition. When truncating the condition to a smaller type, SUB
expressions should use the previous type (before trunc) for both
operands. Also, fix code to also return the modified switch when only
the truncation is performed.

This fixes an assertion crash.

Differential Revision: http://reviews.llvm.org/D6644

rdar://problem/19191835

llvm-svn: 224588
 2014-12-19 17:12:35 +00:00
Bruno Cardoso Lopes 3be15b2fa6 Revert "[InstCombine] Fix visitSwitchInst to use right operand types for sub cstexpr" 
Reverts commit r224574 to appease buildbots:

The visitSwitchInst generates SUB constant expressions to recompute the
switch condition. When truncating the condition to a smaller type, SUB
expressions should use the previous type (before trunc) for both
operands. This fixes an assertion crash.

llvm-svn: 224576
 2014-12-19 14:36:24 +00:00
Bruno Cardoso Lopes c9005f2f2b [InstCombine] Fix visitSwitchInst to use right operand types for sub cstexpr 
The visitSwitchInst generates SUB constant expressions to recompute the
switch condition. When truncating the condition to a smaller type, SUB
expressions should use the previous type (before trunc) for both
operands. This fixes an assertion crash.

Differential Revision: http://reviews.llvm.org/D6644

rdar://problem/19191835

llvm-svn: 224574
 2014-12-19 14:23:15 +00:00
Akira Hatanaka 5c221ef98f Reapply r219832 - InstCombine: Narrow switch instructions using known bits. 
The code committed in r219832 asserted when it attempted to shrink a switch
statement whose type was larger than 64-bit.

llvm-svn: 219902
 2014-10-16 06:00:46 +00:00
Akira Hatanaka 40c2cf4afc Revert r219832. 
llvm-svn: 219884
 2014-10-16 01:17:02 +00:00
Akira Hatanaka 5bb9346a45 InstCombine: Narrow switch instructions using known bits. 
Truncate the operands of a switch instruction to a narrower type if the upper
bits are known to be all ones or zeros.

rdar://problem/17720004

llvm-svn: 219832
 2014-10-15 19:05:50 +00:00