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Author SHA1 Message Date
David Majnemer
6666bdd7cf [Reassociate] Canonicalizing 'x [+-] (-Constant * y)' isn't always a win 
Canonicalizing 'x [+-] (-Constant * y)' is not a win if we don't *know*
we will open up CSE opportunities.

If the multiply was 'nsw', then negating 'y' requires us to clear the
'nsw' flag.  If this is actually worth pursuing, it is probably more
appropriate to do so in GVN or EarlyCSE.

This fixes PR23675.

llvm-svn: 238397
 2015-05-28 06:16:39 +00:00
Chad Rosier
eafdf66096 Revert "[Reassociate] As the expression tree is rewritten make sure the operands are" 
This reverts commit r222142.  This is causing/exposing an execution-time regression
in spec2006/gcc and coremark on AArch64/A57/Ofast.

Conflicts:

	test/Transforms/Reassociate/optional-flags.ll

llvm-svn: 222398
 2014-11-19 23:21:20 +00:00
Chad Rosier
2db8cbf601 [Reassociate] As the expression tree is rewritten make sure the operands are 
emitted in canonical form.

llvm-svn: 222142
 2014-11-17 16:33:50 +00:00
Chad Rosier
fc00bbc305 [Reassociate] Canonicalize constants to RHS operand. 
Fix a thinko where the RHS was already a constant.

llvm-svn: 222139
 2014-11-17 15:52:51 +00:00
Chad Rosier
40ae58f215 [Reassociate] Canonicalize constants to RHS operand. 
llvm-svn: 222005
 2014-11-14 17:05:59 +00:00
Chad Rosier
96d5147e3f [Reassociate] Canonicalize negative constants out of expressions. 
Add support for FDiv, which was regressed by the previous commit.

llvm-svn: 221738
 2014-11-11 23:36:42 +00:00
Chad Rosier
ac6f04f1d5 [Reassociate] Canonicalize negative constants out of expressions. 
This is a reapplication of r221171, but we only perform the transformation
on expressions which include a multiplication.  We do not transform rem/div
operations as this doesn't appear to be safe in all cases.

llvm-svn: 221721
 2014-11-11 22:58:35 +00:00
Reid Kleckner
20ad81c3d1 Revert "[Reassociate] Canonicalize negative constants out of expressions." 
This reverts commit r221171.

It performs this invalid transformation:
-  %div.i = urem i64 -1, %add
-  %sub.i = sub i64 -2, %div.i
+  %div.i = urem i64 1, %add
+  %sub.i1 = add i64 %div.i, -2

llvm-svn: 221317
 2014-11-04 23:42:45 +00:00
Chad Rosier
db50482578 [Reassociate] Canonicalize negative constants out of expressions. 
This gives CSE/GVN more options to eliminate duplicate expressions.
This is a follow up patch to http://reviews.llvm.org/D4904.

http://reviews.llvm.org/D5363

llvm-svn: 221171
 2014-11-03 19:11:30 +00:00