[llvm] r334428 - [SCEV] Add nuw/nsw to mul ops in StrengthenNoWrapFlags where safe.
Sanjoy Das via llvm-commits
llvm-commits at lists.llvm.org
Mon Jun 18 21:14:39 PDT 2018
This was reverted in r335016
On Mon, Jun 11, 2018 at 12:02 PM Justin Lebar via llvm-commits
<llvm-commits at lists.llvm.org> wrote:
>
> Author: jlebar
> Date: Mon Jun 11 11:57:42 2018
> New Revision: 334428
>
> URL: http://llvm.org/viewvc/llvm-project?rev=334428&view=rev
> Log:
> [SCEV] Add nuw/nsw to mul ops in StrengthenNoWrapFlags where safe.
>
> Summary:
> Previously we would add them for adds, but not multiplies.
>
> Reviewers: sanjoy
>
> Subscribers: llvm-commits, hiraditya
>
> Differential Revision: https://reviews.llvm.org/D48038
>
> Added:
> llvm/trunk/test/Analysis/ScalarEvolution/mul-nuw.ll
> Modified:
> llvm/trunk/lib/Analysis/ScalarEvolution.cpp
> llvm/trunk/test/Analysis/Delinearization/a.ll
> llvm/trunk/test/Analysis/Delinearization/iv_times_constant_in_subscript.ll
> llvm/trunk/test/Analysis/IVUsers/quadradic-exit-value.ll
> llvm/trunk/test/Analysis/LoopAccessAnalysis/number-of-memchecks.ll
> llvm/trunk/test/Analysis/LoopAccessAnalysis/wrapping-pointer-versioning.ll
> llvm/trunk/test/Analysis/ScalarEvolution/different-loops-recs.ll
> llvm/trunk/test/Analysis/ScalarEvolution/nsw-offset-assume.ll
> llvm/trunk/test/Analysis/ScalarEvolution/nsw-offset.ll
> llvm/trunk/test/Analysis/ScalarEvolution/nsw.ll
> llvm/trunk/test/Analysis/ScalarEvolution/sext-mul.ll
> llvm/trunk/test/Analysis/ScalarEvolution/sext-zero.ll
> llvm/trunk/test/Analysis/ScalarEvolution/trip-count-pow2.ll
> llvm/trunk/test/Transforms/IndVarSimplify/2011-09-10-widen-nsw.ll
>
> Modified: llvm/trunk/lib/Analysis/ScalarEvolution.cpp
> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Analysis/ScalarEvolution.cpp?rev=334428&r1=334427&r2=334428&view=diff
> ==============================================================================
> --- llvm/trunk/lib/Analysis/ScalarEvolution.cpp (original)
> +++ llvm/trunk/lib/Analysis/ScalarEvolution.cpp Mon Jun 11 11:57:42 2018
> @@ -2205,19 +2205,32 @@ StrengthenNoWrapFlags(ScalarEvolution *S
>
> SignOrUnsignWrap = ScalarEvolution::maskFlags(Flags, SignOrUnsignMask);
>
> - if (SignOrUnsignWrap != SignOrUnsignMask && Type == scAddExpr &&
> - Ops.size() == 2 && isa<SCEVConstant>(Ops[0])) {
> + if (SignOrUnsignWrap != SignOrUnsignMask &&
> + (Type == scAddExpr || Type == scMulExpr) && Ops.size() == 2 &&
> + isa<SCEVConstant>(Ops[0])) {
>
> - // (A + C) --> (A + C)<nsw> if the addition does not sign overflow
> - // (A + C) --> (A + C)<nuw> if the addition does not unsign overflow
> + auto Opcode = [&] {
> + switch (Type) {
> + case scAddExpr:
> + return Instruction::Add;
> + case scMulExpr:
> + return Instruction::Mul;
> + default:
> + llvm_unreachable("Unexpected SCEV op.");
> + }
> + }();
>
> const APInt &C = cast<SCEVConstant>(Ops[0])->getAPInt();
> +
> + // (A <opcode> C) --> (A <opcode> C)<nsw> if the op doesn't sign overflow.
> if (!(SignOrUnsignWrap & SCEV::FlagNSW)) {
> auto NSWRegion = ConstantRange::makeGuaranteedNoWrapRegion(
> - Instruction::Add, C, OBO::NoSignedWrap);
> + Opcode, C, OBO::NoSignedWrap);
> if (NSWRegion.contains(SE->getSignedRange(Ops[1])))
> Flags = ScalarEvolution::setFlags(Flags, SCEV::FlagNSW);
> }
> +
> + // (A <opcode> C) --> (A <opcode> C)<nuw> if the op doesn't unsign overflow.
> if (!(SignOrUnsignWrap & SCEV::FlagNUW)) {
> auto NUWRegion = ConstantRange::makeGuaranteedNoWrapRegion(
> Instruction::Add, C, OBO::NoUnsignedWrap);
>
> Modified: llvm/trunk/test/Analysis/Delinearization/a.ll
> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Analysis/Delinearization/a.ll?rev=334428&r1=334427&r2=334428&view=diff
> ==============================================================================
> --- llvm/trunk/test/Analysis/Delinearization/a.ll (original)
> +++ llvm/trunk/test/Analysis/Delinearization/a.ll Mon Jun 11 11:57:42 2018
> @@ -10,7 +10,7 @@
> ; AddRec: {{{(28 + (4 * (-4 + (3 * %m)) * %o) + %A),+,(8 * %m * %o)}<%for.i>,+,(12 * %o)}<%for.j>,+,20}<%for.k>
> ; CHECK: Base offset: %A
> ; CHECK: ArrayDecl[UnknownSize][%m][%o] with elements of 4 bytes.
> -; CHECK: ArrayRef[{3,+,2}<%for.i>][{-4,+,3}<nw><%for.j>][{7,+,5}<nw><%for.k>]
> +; CHECK: ArrayRef[{3,+,2}<nw><%for.i>][{-4,+,3}<nw><%for.j>][{7,+,5}<nw><%for.k>]
>
> define void @foo(i64 %n, i64 %m, i64 %o, i32* nocapture %A) #0 {
> entry:
>
> Modified: llvm/trunk/test/Analysis/Delinearization/iv_times_constant_in_subscript.ll
> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Analysis/Delinearization/iv_times_constant_in_subscript.ll?rev=334428&r1=334427&r2=334428&view=diff
> ==============================================================================
> --- llvm/trunk/test/Analysis/Delinearization/iv_times_constant_in_subscript.ll (original)
> +++ llvm/trunk/test/Analysis/Delinearization/iv_times_constant_in_subscript.ll Mon Jun 11 11:57:42 2018
> @@ -11,7 +11,7 @@
> ; AddRec: {{((%m * %b * 8) + %A),+,(2 * %m * 8)}<%for.i>,+,(2 * 8)}<%for.j>
> ; CHECK: Base offset: %A
> ; CHECK: ArrayDecl[UnknownSize][%m] with elements of 8 bytes.
> -; CHECK: ArrayRef[{%b,+,2}<nsw><%for.i>][{0,+,2}<%for.j>]
> +; CHECK: ArrayRef[{%b,+,2}<nsw><%for.i>][{0,+,2}<nuw><%for.j>]
>
>
> define void @foo(i64 %n, i64 %m, i64 %b, double* %A) {
>
> Modified: llvm/trunk/test/Analysis/IVUsers/quadradic-exit-value.ll
> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Analysis/IVUsers/quadradic-exit-value.ll?rev=334428&r1=334427&r2=334428&view=diff
> ==============================================================================
> --- llvm/trunk/test/Analysis/IVUsers/quadradic-exit-value.ll (original)
> +++ llvm/trunk/test/Analysis/IVUsers/quadradic-exit-value.ll Mon Jun 11 11:57:42 2018
> @@ -70,7 +70,7 @@ exit:
> ; sure they aren't marked as post-inc users.
> ;
> ; CHECK-LABEL: IV Users for loop %test2.loop
> -; CHECK-NO-LCSSA: %sub.cond.us = ((-1 * %sub.us)<nsw> + {0,+,1}<nuw><nsw><%test2.loop>) (post-inc with loop %test2.loop) in %sext.us = mul i32 %mul.us, %sub.cond.us
> +; CHECK-NO-LCSSA: %sub.cond.us = ((-1 * %sub.us)<nuw><nsw> + {0,+,1}<nuw><nsw><%test2.loop>) (post-inc with loop %test2.loop) in %sext.us = mul i32 %mul.us, %sub.cond.us
> define i32 @test2() {
> entry:
> br label %test2.loop
>
> Modified: llvm/trunk/test/Analysis/LoopAccessAnalysis/number-of-memchecks.ll
> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Analysis/LoopAccessAnalysis/number-of-memchecks.ll?rev=334428&r1=334427&r2=334428&view=diff
> ==============================================================================
> --- llvm/trunk/test/Analysis/LoopAccessAnalysis/number-of-memchecks.ll (original)
> +++ llvm/trunk/test/Analysis/LoopAccessAnalysis/number-of-memchecks.ll Mon Jun 11 11:57:42 2018
> @@ -251,10 +251,10 @@ for.end:
> ; CHECK-NEXT: Member: {((2 * %offset) + %a)<nsw>,+,2}<nsw><%for.body>
> ; CHECK-NEXT: Group {{.*}}[[ONE]]:
> ; CHECK-NEXT: (Low: %a High: (10000 + %a))
> -; CHECK-NEXT: Member: {%a,+,2}<%for.body>
> +; CHECK-NEXT: Member: {%a,+,2}<nw><%for.body>
> ; CHECK-NEXT: Group {{.*}}[[TWO]]:
> ; CHECK-NEXT: (Low: (20000 + %a) High: (30000 + %a))
> -; CHECK-NEXT: Member: {(20000 + %a),+,2}<%for.body>
> +; CHECK-NEXT: Member: {(20000 + %a),+,2}<nw><%for.body>
>
> define void @testi(i16* %a,
> i64 %offset) {
>
> Modified: llvm/trunk/test/Analysis/LoopAccessAnalysis/wrapping-pointer-versioning.ll
> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Analysis/LoopAccessAnalysis/wrapping-pointer-versioning.ll?rev=334428&r1=334427&r2=334428&view=diff
> ==============================================================================
> --- llvm/trunk/test/Analysis/LoopAccessAnalysis/wrapping-pointer-versioning.ll (original)
> +++ llvm/trunk/test/Analysis/LoopAccessAnalysis/wrapping-pointer-versioning.ll Mon Jun 11 11:57:42 2018
> @@ -33,7 +33,7 @@ target datalayout = "e-m:o-i64:64-f80:12
> ; i64 {0,+,2}<%for.body>
>
> ; LAA: [PSE] %arrayidxA = getelementptr i16, i16* %a, i64 %mul_ext:
> -; LAA-NEXT: ((2 * (zext i32 {0,+,2}<%for.body> to i64)) + %a)
> +; LAA-NEXT: ((2 * (zext i32 {0,+,2}<%for.body> to i64))<nuw> + %a)
> ; LAA-NEXT: --> {%a,+,4}<%for.body>
>
>
> @@ -122,7 +122,7 @@ for.end:
> ; LAA: Memory dependences are safe{{$}}
> ; LAA: SCEV assumptions:
> ; LAA-NEXT: {(2 * (trunc i64 %N to i32)),+,-2}<%for.body> Added Flags: <nusw>
> -; LAA-NEXT: {((2 * (zext i32 (2 * (trunc i64 %N to i32)) to i64)) + %a),+,-4}<%for.body> Added Flags: <nusw>
> +; LAA-NEXT: {((2 * (zext i32 (2 * (trunc i64 %N to i32)) to i64))<nuw> + %a),+,-4}<%for.body> Added Flags: <nusw>
>
> ; The expression for %mul_ext as analyzed by SCEV is
> ; (zext i32 {(2 * (trunc i64 %N to i32)),+,-2}<%for.body> to i64)
> @@ -130,8 +130,8 @@ for.end:
> ; i64 {zext i32 (2 * (trunc i64 %N to i32)) to i64,+,-2}<%for.body>
>
> ; LAA: [PSE] %arrayidxA = getelementptr i16, i16* %a, i64 %mul_ext:
> -; LAA-NEXT: ((2 * (zext i32 {(2 * (trunc i64 %N to i32)),+,-2}<%for.body> to i64)) + %a)
> -; LAA-NEXT: --> {((2 * (zext i32 (2 * (trunc i64 %N to i32)) to i64)) + %a),+,-4}<%for.body>
> +; LAA-NEXT: ((2 * (zext i32 {(2 * (trunc i64 %N to i32)),+,-2}<%for.body> to i64))<nuw> + %a)
> +; LAA-NEXT: --> {((2 * (zext i32 (2 * (trunc i64 %N to i32)) to i64))<nuw> + %a),+,-4}<%for.body>
>
> ; LV-LABEL: f2
> ; LV-LABEL: for.body.lver.check
>
> Modified: llvm/trunk/test/Analysis/ScalarEvolution/different-loops-recs.ll
> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Analysis/ScalarEvolution/different-loops-recs.ll?rev=334428&r1=334427&r2=334428&view=diff
> ==============================================================================
> --- llvm/trunk/test/Analysis/ScalarEvolution/different-loops-recs.ll (original)
> +++ llvm/trunk/test/Analysis/ScalarEvolution/different-loops-recs.ll Mon Jun 11 11:57:42 2018
> @@ -321,7 +321,7 @@ define void @test_05(i32 %N) {
> ; CHECK: %SQ = mul i32 %i.0, %i.0
> ; CHECK-NEXT: --> {4,+,5,+,2}<%bb3>
> ; CHECK: %tmp4 = mul i32 %i.0, 2
> -; CHECK-NEXT: --> {4,+,2}<%bb3>
> +; CHECK-NEXT: --> {4,+,2}<nuw><%bb3>
> ; CHECK: %tmp5 = sub i32 %SQ, %tmp4
> ; CHECK-NEXT: --> {0,+,3,+,2}<%bb3>
>
>
> Added: llvm/trunk/test/Analysis/ScalarEvolution/mul-nuw.ll
> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Analysis/ScalarEvolution/mul-nuw.ll?rev=334428&view=auto
> ==============================================================================
> --- llvm/trunk/test/Analysis/ScalarEvolution/mul-nuw.ll (added)
> +++ llvm/trunk/test/Analysis/ScalarEvolution/mul-nuw.ll Mon Jun 11 11:57:42 2018
> @@ -0,0 +1,15 @@
> +; RUN: opt < %s -analyze -scalar-evolution | FileCheck %s
> +
> +; Check that we add nuw to multiplies by a constant where we can infer that the
> +; multiply does not have unsigned overflow.
> +declare i32 @get_int();
> +
> +define void @foo() {
> + %a = call i32 @get_int(), !range !0
> + %b = mul i32 %a, 4
> + ; CHECK: %b
> + ; CHECK-NEXT: --> (4 * %a)<nuw>
> + ret void
> +}
> +
> +!0 = !{i32 0, i32 100}
>
> Modified: llvm/trunk/test/Analysis/ScalarEvolution/nsw-offset-assume.ll
> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Analysis/ScalarEvolution/nsw-offset-assume.ll?rev=334428&r1=334427&r2=334428&view=diff
> ==============================================================================
> --- llvm/trunk/test/Analysis/ScalarEvolution/nsw-offset-assume.ll (original)
> +++ llvm/trunk/test/Analysis/ScalarEvolution/nsw-offset-assume.ll Mon Jun 11 11:57:42 2018
> @@ -79,5 +79,5 @@ declare void @llvm.assume(i1) nounwind
>
> ; Note: Without the preheader assume, there is an 'smax' in the
> ; backedge-taken count expression:
> -; CHECK: Loop %bb: backedge-taken count is ((-1 + (2 * (%no /u 2))) /u 2)
> +; CHECK: Loop %bb: backedge-taken count is ((-1 + (2 * (%no /u 2))<nuw>) /u 2)
> ; CHECK: Loop %bb: max backedge-taken count is 1073741822
>
> Modified: llvm/trunk/test/Analysis/ScalarEvolution/nsw-offset.ll
> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Analysis/ScalarEvolution/nsw-offset.ll?rev=334428&r1=334427&r2=334428&view=diff
> ==============================================================================
> --- llvm/trunk/test/Analysis/ScalarEvolution/nsw-offset.ll (original)
> +++ llvm/trunk/test/Analysis/ScalarEvolution/nsw-offset.ll Mon Jun 11 11:57:42 2018
> @@ -73,5 +73,5 @@ return:
> ret void
> }
>
> -; CHECK: Loop %bb: backedge-taken count is ((-1 + (2 * (%no /u 2))) /u 2)
> +; CHECK: Loop %bb: backedge-taken count is ((-1 + (2 * (%no /u 2))<nuw>) /u 2)
> ; CHECK: Loop %bb: max backedge-taken count is 1073741822
>
> Modified: llvm/trunk/test/Analysis/ScalarEvolution/nsw.ll
> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Analysis/ScalarEvolution/nsw.ll?rev=334428&r1=334427&r2=334428&view=diff
> ==============================================================================
> --- llvm/trunk/test/Analysis/ScalarEvolution/nsw.ll (original)
> +++ llvm/trunk/test/Analysis/ScalarEvolution/nsw.ll Mon Jun 11 11:57:42 2018
> @@ -25,7 +25,7 @@ bb: ; preds = %bb1, %bb.nph
> %tmp6 = sext i32 %i.01 to i64 ; <i64> [#uses=1]
> %tmp7 = getelementptr double, double* %p, i64 %tmp6 ; <double*> [#uses=1]
> ; CHECK: %tmp7
> -; CHECK-NEXT: --> {%p,+,8}<%bb>
> +; CHECK-NEXT: --> {%p,+,8}<nw><%bb>
> store double %tmp5, double* %tmp7, align 8
> %tmp8 = add nsw i32 %i.01, 1 ; <i32> [#uses=2]
> ; CHECK: %tmp8
> @@ -126,7 +126,7 @@ exit:
> }
>
> ; CHECK-LABEL: PR12375
> -; CHECK: --> {(4 + %arg)<nsw>,+,4}<nuw><%bb1>{{ U: [^ ]+ S: [^ ]+}}{{ *}}Exits: (4 + (4 * ((-1 + (-1 * %arg) + ((4 + %arg)<nsw> umax (8 + %arg)<nsw>)) /u 4)) + %arg)
> +; CHECK: --> {(4 + %arg)<nsw>,+,4}<nuw><%bb1>{{ U: [^ ]+ S: [^ ]+}}{{ *}}Exits: (4 + (4 * ((-1 + (-1 * %arg) + ((4 + %arg)<nsw> umax (8 + %arg)<nsw>)) /u 4))<nuw> + %arg)
> define i32 @PR12375(i32* readnone %arg) {
> bb:
> %tmp = getelementptr inbounds i32, i32* %arg, i64 2
> @@ -145,7 +145,7 @@ bb7:
> }
>
> ; CHECK-LABEL: PR12376
> -; CHECK: --> {(4 + %arg)<nsw>,+,4}<nuw><%bb2>{{ U: [^ ]+ S: [^ ]+}}{{ *}}Exits: (4 + (4 * ((-1 + (-1 * %arg) + ((4 + %arg)<nsw> umax %arg1)) /u 4)) + %arg)
> +; CHECK: --> {(4 + %arg)<nsw>,+,4}<nuw><%bb2>{{ U: [^ ]+ S: [^ ]+}}{{ *}}Exits: (4 + (4 * ((-1 + (-1 * %arg) + ((4 + %arg)<nsw> umax %arg1)) /u 4))<nuw> + %arg)
> define void @PR12376(i32* nocapture %arg, i32* nocapture %arg1) {
> bb:
> br label %bb2
>
> Modified: llvm/trunk/test/Analysis/ScalarEvolution/sext-mul.ll
> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Analysis/ScalarEvolution/sext-mul.ll?rev=334428&r1=334427&r2=334428&view=diff
> ==============================================================================
> --- llvm/trunk/test/Analysis/ScalarEvolution/sext-mul.ll (original)
> +++ llvm/trunk/test/Analysis/ScalarEvolution/sext-mul.ll Mon Jun 11 11:57:42 2018
> @@ -1,7 +1,7 @@
> ; RUN: opt < %s -analyze -scalar-evolution | FileCheck %s
>
> ; CHECK: %tmp9 = shl i64 %tmp8, 33
> -; CHECK-NEXT: --> {{.*}} Exits: (-8589934592 + (8589934592 * (zext i32 %arg2 to i64)))
> +; CHECK-NEXT: --> {{.*}} Exits: (-8589934592 + (8589934592 * (zext i32 %arg2 to i64))<nuw>)
> ; CHECK: %tmp10 = ashr exact i64 %tmp9, 32
> ; CHECK-NEXT: --> {{.*}} Exits: (sext i32 (-2 + (2 * %arg2)) to i64)
> ; CHECK: %tmp11 = getelementptr inbounds i32, i32* %arg, i64 %tmp10
> @@ -48,9 +48,9 @@ bb7:
> }
>
> ; CHECK: %t10 = ashr exact i128 %t9, 1
> -; CHECK-NEXT: --> {{.*}} Exits: (sext i127 (-633825300114114700748351602688 + (633825300114114700748351602688 * (zext i32 %arg5 to i127))) to i128)
> +; CHECK-NEXT: --> {{.*}} Exits: (sext i127 (-633825300114114700748351602688 + (633825300114114700748351602688 * (zext i32 %arg5 to i127))<nuw>) to i128)
> ; CHECK: %t14 = or i128 %t10, 1
> -; CHECK-NEXT: --> {{.*}} Exits: (1 + (sext i127 (-633825300114114700748351602688 + (633825300114114700748351602688 * (zext i32 %arg5 to i127))) to i128))<nsw>
> +; CHECK-NEXT: --> {{.*}} Exits: (1 + (sext i127 (-633825300114114700748351602688 + (633825300114114700748351602688 * (zext i32 %arg5 to i127))<nuw>) to i128))<nsw>
> ; CHECK: Loop %bb7: backedge-taken count is (-1 + (zext i32 %arg5 to i128))<nsw>
> ; CHECK-NEXT: Loop %bb7: max backedge-taken count is -1
> ; CHECK-NEXT: Loop %bb7: Predicated backedge-taken count is (-1 + (zext i32 %arg5 to i128))<nsw>
>
> Modified: llvm/trunk/test/Analysis/ScalarEvolution/sext-zero.ll
> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Analysis/ScalarEvolution/sext-zero.ll?rev=334428&r1=334427&r2=334428&view=diff
> ==============================================================================
> --- llvm/trunk/test/Analysis/ScalarEvolution/sext-zero.ll (original)
> +++ llvm/trunk/test/Analysis/ScalarEvolution/sext-zero.ll Mon Jun 11 11:57:42 2018
> @@ -1,9 +1,9 @@
> ; RUN: opt < %s -analyze -scalar-evolution | FileCheck %s
>
> ; CHECK: %tmp9 = shl i64 %tmp8, 33
> -; CHECK-NEXT: --> {{.*}} Exits: (-8589934592 + (8589934592 * (zext i32 %arg2 to i64)))
> +; CHECK-NEXT: --> {{.*}} Exits: (-8589934592 + (8589934592 * (zext i32 %arg2 to i64))<nuw>)
> ; CHECK-NEXT: %tmp10 = ashr exact i64 %tmp9, 0
> -; CHECK-NEXT: --> {{.*}} Exits: (-8589934592 + (8589934592 * (zext i32 %arg2 to i64)))
> +; CHECK-NEXT: --> {{.*}} Exits: (-8589934592 + (8589934592 * (zext i32 %arg2 to i64))<nuw>)
>
> define void @foo(i32* nocapture %arg, i32 %arg1, i32 %arg2) {
> bb:
>
> Modified: llvm/trunk/test/Analysis/ScalarEvolution/trip-count-pow2.ll
> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Analysis/ScalarEvolution/trip-count-pow2.ll?rev=334428&r1=334427&r2=334428&view=diff
> ==============================================================================
> --- llvm/trunk/test/Analysis/ScalarEvolution/trip-count-pow2.ll (original)
> +++ llvm/trunk/test/Analysis/ScalarEvolution/trip-count-pow2.ll Mon Jun 11 11:57:42 2018
> @@ -31,7 +31,7 @@ exit:
> ret i32 %i
>
> ; CHECK-LABEL: @test2
> -; CHECK: Loop %loop: backedge-taken count is ((-32 + (32 * (%n /u 32))) /u 32)
> +; CHECK: Loop %loop: backedge-taken count is ((-32 + (32 * (%n /u 32))<nuw>) /u 32)
> ; CHECK: Loop %loop: max backedge-taken count is 134217727
> }
>
>
> Modified: llvm/trunk/test/Transforms/IndVarSimplify/2011-09-10-widen-nsw.ll
> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Transforms/IndVarSimplify/2011-09-10-widen-nsw.ll?rev=334428&r1=334427&r2=334428&view=diff
> ==============================================================================
> --- llvm/trunk/test/Transforms/IndVarSimplify/2011-09-10-widen-nsw.ll (original)
> +++ llvm/trunk/test/Transforms/IndVarSimplify/2011-09-10-widen-nsw.ll Mon Jun 11 11:57:42 2018
> @@ -20,7 +20,7 @@ for.body153:
> ; CHECK: add nuw nsw i64 %indvars.iv, 1
> ; CHECK: sub nsw i64 %indvars.iv, 2
> ; CHECK: sub nsw i64 4, %indvars.iv
> -; CHECK: mul nsw i64 %indvars.iv, 8
> +; CHECK: mul nuw nsw i64 %indvars.iv, 8
> for.body170: ; preds = %for.body170, %for.body153
> %i2.19 = phi i32 [ %add249, %for.body170 ], [ 0, %for.body153 ]
>
>
>
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