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4 Commits

Author SHA1 Message Date
Sanjay Patel e12d734be3 [InstCombine] narrow truncated add/sub/mul with constant 
Name: narrow_sub
  %sub = sub i32 C1, %x
  %r = trunc i32 %sub to i8
  =>  
  %xn = trunc i32 %x to i8
  %narrowC = trunc i32 C1 to i8
  %r = sub i8 %narrowC, %xn
 
Name: narrow_add
  %add = add i32 %x, C1
  %r = trunc i32 %add to i8
  =>  
  %xn = trunc i32 %x to i8
  %narrowC = trunc i32 C1 to i8
  %r = add i8 %xn, %narrowC
  
Name: narrow_mul
  %mul = mul i32 %x, C1
  %r = trunc i32 %mul to i8
  =>  
  %xn = trunc i32 %x to i8
  %narrowC = trunc i32 C1 to i8
  %r = mul i8 %xn, %narrowC


http://rise4fun.com/Alive/QpS

This doesn't solve PR34046 (failure to recognize rotate):
https://bugs.llvm.org/show_bug.cgi?id=34046
...but it reduces an extra complication in the description examples 
to a form that we can more easily match.

llvm-svn: 310141
 2017-08-04 22:30:34 +00:00
Sanjay Patel 029fc7719b [InstCombine] auto-generate test checks; NFC 
llvm-svn: 310101
 2017-08-04 19:29:32 +00:00
Davide Italiano 67e979e086 [SimplifyLibCalls] Add a test to make sure we lower fls(0) correctly. 
llvm-svn: 289895
 2016-12-15 23:48:07 +00:00
Davide Italiano 85ad36b0e0 [SimplifyLibCalls] Lower fls() to llvm.ctlz(). 
Differential Revision:  https://reviews.llvm.org/D14590

llvm-svn: 289894
 2016-12-15 23:45:11 +00:00