llvm-svn: 53177

llvm-svn: 53151

Use information already present in the ValueTable to fast-fail when we know there won't be a value number match.  This speeds up GVN on a case where there are very few redundancies by ~25%.

llvm-svn: 53108

Do not try to update dominator info while manipulating CFG.  This code does not handle all cases and keeps invalid dom info around some cases, which misleads other passes down stream.

Right now, dom info is recaluclated in the end if the loop is switched.

llvm-svn: 53106

Remove the ability for ADCE to remove unreachable blocks in loop nests, because, as Eli pointed out, SimplifyCFG already does this.

llvm-svn: 53104

llvm-svn: 53090

llvm-svn: 53089

llvm-svn: 53087

llvm-svn: 53086

llvm-svn: 53085

llvm-svn: 53062

llvm-svn: 53052

Also, move large sets and vectors out of instance variables and onto the stack,
and give them more reasonable sizes.

llvm-svn: 53044

llvm-svn: 53040

part of PR2509.

llvm-svn: 53038

with a huge "size" parameter is actually quite inefficient.

llvm-svn: 53034

llvm-svn: 53032

llvm-svn: 53007

llvm-svn: 53006

Keep track of currentLoop.

llvm-svn: 53005

- Re-apply 52748 and friends with fix. GetConstantStringInfo() returns an empty string for ConstantAggregateZero case which surprises selectiondag.
- Correctly handle memcpy from constant string which is zero-initialized.

llvm-svn: 52891

Move GetConstantStringInfo to lib/Analysis. Remove
string output routine from Constant. Update all
callers. Change debug intrinsic api slightly to
accomodate move of routine, these now return values
instead of strings.

This unbreaks llvm-gcc bootstrap.

llvm-svn: 52884

llvm-svn: 52749

string output routine from Constant. Update all
callers. Change debug intrinsic api slightly to
accomodate move of routine, these now return values
instead of strings.

llvm-svn: 52748

llvm-svn: 52736

llvm-svn: 52723

llvm-svn: 52705

llvm-svn: 52704

- Avoid speculatively execute vector ops.

llvm-svn: 52703

llvm-svn: 52702

llvm-svn: 52688

llvm-svn: 52687

Also add a testcase to reproduce the gcc bootstrap failure in very much reduced form.

llvm-svn: 52677

llvm-svn: 52672

llvm-svn: 52651

llvm-svn: 52648

in the presence of out-of-loop users of in-loop values and the trip
count is not a known multiple of the unroll count, and to be a bit
simpler overall. This fixes PR2253.

llvm-svn: 52645

llvm-svn: 52643

Tighten the conditions under which we do PRE, remove some unneeded code, and correct our preserved analyses list, since we
do now change the CFG by splitting critical edges during PRE.

llvm-svn: 52631

llvm-svn: 52630