Sanjoy Das 31123d4529 This patch teaches IndVarSimplify to add nuw and nsw to certain kinds ... of operations that provably don't overflow. For example, we can prove %civ.inc below does not sign-overflow. With this change, IndVarSimplify changes %civ.inc to an add nsw. define i32 @foo(i32* %array, i32* %length_ptr, i32 %init) { entry: %length = load i32* %length_ptr, !range !0 %len.sub.1 = sub i32 %length, 1 %upper = icmp slt i32 %init, %len.sub.1 br i1 %upper, label %loop, label %exit loop: %civ = phi i32 [ %init, %entry ], [ %civ.inc, %latch ] %civ.inc = add i32 %civ, 1 %cmp = icmp slt i32 %civ.inc, %length br i1 %cmp, label %latch, label %break latch: store i32 0, i32* %array %check = icmp slt i32 %civ.inc, %len.sub.1 br i1 %check, label %loop, label %break break: ret i32 %civ.inc exit: ret i32 42 } Differential Revision: http://reviews.llvm.org/D6748 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225282 91177308-0d34-0410-b5e6-96231b3b80d8		2015-01-06 19:02:56 +00:00
..
NVPTX	Disable indvar widening if arithmetics on the wider type are more expensive	2014-11-12 18:09:15 +00:00
2002-09-09-PointerIndVar.ll
2003-04-16-ExprAnalysis.ll
2003-09-23-NotAtTop.ll	Tests: rewrite 'opt ... %s' to 'opt ... < %s' so that opt does not emit a ModuleID	2012-12-30 01:28:40 +00:00
2003-12-10-RemoveInstrCrash.ll
2003-12-15-Crash.ll
2004-03-10-PHIInsertionBug.ll
2004-04-05-InvokeCastCrash.ll
2004-04-07-ScalarEvolutionCrash.ll
2005-02-11-InvokeCrash.ll
2005-02-17-TruncateExprCrash.ll
2005-02-26-ExitValueCompute.ll
2005-06-15-InstMoveCrash.ll
2005-11-18-Crash.ll
2006-03-31-NegativeStride.ll
2006-06-16-Indvar-LCSSA-Crash.ll
2006-09-20-LFTR-Crash.ll
2006-12-10-BitCast.ll
2007-01-06-TripCount.ll
2007-06-06-DeleteDanglesPtr.ll
2007-11-23-BitcastCrash.ll
2008-06-15-SCEVExpanderBug.ll
2008-09-02-IVType.ll
2008-10-03-CouldNotCompute.ll
2008-11-25-APFloatAssert.ll
2009-04-14-shorten_iv_vars.ll
2009-04-15-shorten-iv-vars-2.ll
2009-04-22-IndvarCrash.ll
2009-04-27-Floating.ll
2009-05-24-useafterfree.ll
2011-09-10-widen-nsw.ll	This patch teaches IndVarSimplify to add nuw and nsw to certain kinds	2015-01-06 19:02:56 +00:00
2011-09-19-vectoriv.ll
2011-09-27-hoistsext.ll
2011-10-27-lftrnull.ll	IndVarSimplify: Don't let LFTR compare against a poison value	2014-09-03 23:03:18 +00:00
2011-11-01-lftrptr.ll	Update Transforms tests to use CHECK-LABEL for easier debugging. No functionality change.	2013-07-14 01:42:54 +00:00
2011-11-15-multiexit.ll
2011-11-17-selfphi.ll	Update Transforms tests to use CHECK-LABEL for easier debugging. No functionality change.	2013-07-14 01:42:54 +00:00
2012-07-17-lftr-undef.ll	Update Transforms tests to use CHECK-LABEL for easier debugging. No functionality change.	2013-07-14 01:42:54 +00:00
2012-10-19-congruent-constant.ll	Update Transforms tests to use CHECK-LABEL for easier debugging. No functionality change.	2013-07-14 01:42:54 +00:00
2014-06-21-congruent-constant.ll	Add a description to the test from r211433 explaining why it's written that way.	2014-06-22 12:22:04 +00:00
ada-loops.ll
ashr-tripcount.ll
avoid-i0.ll
backedge-on-min-max.ll	Teach ScalarEvolution to exploit min and max expressions when proving	2014-12-15 22:50:15 +00:00
casted-argument.ll
crash.ll	Tests: rewrite 'opt ... %s' to 'opt ... < %s' so that opt does not emit a ModuleID	2012-12-30 02:33:22 +00:00
dangling-use.ll
divide-pointer.ll
dont-recompute.ll	Update Transforms tests to use CHECK-LABEL for easier debugging. No functionality change.	2013-07-14 01:42:54 +00:00
elim-extend.ll
eliminate-comparison.ll	Update Transforms tests to use CHECK-LABEL for easier debugging. No functionality change.	2013-07-14 01:42:54 +00:00
eliminate-max.ll
eliminate-rem.ll	Update Transforms tests to use CHECK-LABEL for easier debugging. No functionality change.	2013-07-14 01:42:54 +00:00
exit_value_tests.ll
floating-point-iv.ll	Update Transforms tests to use CHECK-LABEL for easier debugging. No functionality change.	2013-07-14 01:42:54 +00:00
indirectbr.ll
interesting-invoke-use.ll
iterationCount_zext_or_trunc.ll
iv-fold.ll	Update Transforms tests to use CHECK-LABEL for easier debugging. No functionality change.	2013-07-14 01:42:54 +00:00
iv-sext.ll
iv-widen.ll	Reapply r198654 "indvars: sink truncates outside the loop."	2014-01-07 06:59:12 +00:00
iv-zext.ll
lcssa-preservation.ll	[LPM] Fix PR18642, a pretty nasty bug in IndVars that "never mattered"	2014-01-29 04:40:19 +00:00
lftr_simple.ll
lftr-address-space-pointers.ll	IndVarSimplify: Don't let LFTR compare against a poison value	2014-09-03 23:03:18 +00:00
lftr-extend-const.ll	IndVarSimplify: Allow LFTR to fire more often	2014-11-18 02:20:58 +00:00
lftr-other-uses.ll
lftr-promote.ll
lftr-reuse.ll	IndVarSimplify: Don't let LFTR compare against a poison value	2014-09-03 23:03:18 +00:00
lftr-zext.ll	Fix a bug in LinearFunctionTestReplace that created invalid loop exit checks.	2013-10-24 05:29:56 +00:00
loop_evaluate7.ll
loop_evaluate8.ll
loop_evaluate9.ll
loop_evaluate10.ll
loop_evaluate11.ll
loop_evaluate_1.ll	Add test case for PR12377, it was fixed by r194116.	2013-11-06 11:55:41 +00:00
loop_evaluate_2.ll
loop_evaluate_3.ll
loop_evaluate_4.ll
loop_evaluate_5.ll
loop_evaluate_6.ll	Rewrite SCEV's backedge taken count computation.	2013-11-06 02:08:26 +00:00
masked-iv.ll
no-iv-rewrite.ll	[IndVarSimplify] Widen loop compare instructions.	2014-09-17 14:10:33 +00:00
overflowcheck.ll	Add support to indvars for optimizing sadd.with.overflow.	2013-12-23 23:31:49 +00:00
phi-uses-value-multiple-times.ll	Revert the test moves from 176733. Use "REQUIRES: asserts" instead.	2013-03-12 16:27:52 +00:00
polynomial-expand.ll
pr18223.ll	ScalarEvolution: Fix handling of AddRecs in isKnownPredicate	2014-05-23 00:06:56 +00:00
pr20680.ll	IndVarSimplify: Don't let LFTR compare against a poison value	2014-09-03 23:03:18 +00:00
preserve-signed-wrap.ll
promote-iv-to-eliminate-casts.ll
sharpen-range.ll	IR: Make metadata typeless in assembly	2014-12-15 19:07:53 +00:00
shrunk-constant.ll
signed-trip-count.ll
single-element-range.ll
sink-alloca.ll
sink-trapping.ll
strengthen-overflow.ll	This patch teaches IndVarSimplify to add nuw and nsw to certain kinds	2015-01-06 19:02:56 +00:00
tripcount_compute.ll	Fix PR18449: SCEV needs more precise max BECount for multi-exit loop.	2014-01-15 06:42:11 +00:00
tripcount_infinite.ll
udiv-invariant-but-traps.ll	Update Transforms tests to use CHECK-LABEL for easier debugging. No functionality change.	2013-07-14 01:42:54 +00:00
udiv.ll	Update Transforms tests to use CHECK-LABEL for easier debugging. No functionality change.	2013-07-14 01:42:54 +00:00
uglygep.ll
ult-sub-to-eq.ll	Update Transforms tests to use CHECK-LABEL for easier debugging. No functionality change.	2013-07-14 01:42:54 +00:00
use-range-metadata.ll	IR: Make metadata typeless in assembly	2014-12-15 19:07:53 +00:00
variable-stride-ivs-0.ll
variable-stride-ivs-1.ll
verify-scev.ll	[IndVarSimplify] Widen loop compare instructions.	2014-09-17 14:10:33 +00:00
widen-loop-comp.ll	Teach ScalarEvolution to sharpen range information.	2014-11-13 00:00:58 +00:00
widen-nsw.ll	Teach indvars to generate nsw/nuw flags when widening an induction variable.	2013-07-14 02:50:07 +00:00