Revert r230280: "Bugfix: SCEVExpander incorrectly marks increment operations as no...

This caused PR22674, failing this assert:

Instructions.h:2281: llvm::Value* llvm::PHINode::getOperand(unsigned int) const: Assertion `i_nocapture < OperandTraits<PHINode>::operands(this) && "getOperand() out of range!"' failed.

llvm-svn: 230341

diff --git a/llvm/lib/Analysis/ScalarEvolutionExpander.cpp b/llvm/lib/Analysis/ScalarEvolutionExpander.cpp
index ef95571..59f19a0 100644 (file)
--- a/llvm/lib/Analysis/ScalarEvolutionExpander.cpp
+++ b/llvm/lib/Analysis/ScalarEvolutionExpander.cpp
@@ -1063,34 +1063,6 @@ static bool canBeCheaplyTransformed(ScalarEvolution &SE,
   return false;
 }
 
-static bool IsIncrementNSW(ScalarEvolution &SE, const SCEVAddRecExpr *AR) {
-  if (!isa<IntegerType>(AR->getType()))
-    return false;
-
-  unsigned BitWidth = cast<IntegerType>(AR->getType())->getBitWidth();
-  Type *WideTy = IntegerType::get(AR->getType()->getContext(), BitWidth * 2);
-  const SCEV *Step = AR->getStepRecurrence(SE);
-  const SCEV *OpAfterExtend = SE.getAddExpr(SE.getSignExtendExpr(Step, WideTy),
-                                            SE.getSignExtendExpr(AR, WideTy));
-  const SCEV *ExtendAfterOp =
-    SE.getSignExtendExpr(SE.getAddExpr(AR, Step), WideTy);
-  return ExtendAfterOp == OpAfterExtend;
-}
-
-static bool IsIncrementNUW(ScalarEvolution &SE, const SCEVAddRecExpr *AR) {
-  if (!isa<IntegerType>(AR->getType()))
-    return false;
-
-  unsigned BitWidth = cast<IntegerType>(AR->getType())->getBitWidth();
-  Type *WideTy = IntegerType::get(AR->getType()->getContext(), BitWidth * 2);
-  const SCEV *Step = AR->getStepRecurrence(SE);
-  const SCEV *OpAfterExtend = SE.getAddExpr(SE.getZeroExtendExpr(Step, WideTy),
-                                            SE.getZeroExtendExpr(AR, WideTy));
-  const SCEV *ExtendAfterOp =
-    SE.getZeroExtendExpr(SE.getAddExpr(AR, Step), WideTy);
-  return ExtendAfterOp == OpAfterExtend;
-}
-
 /// getAddRecExprPHILiterally - Helper for expandAddRecExprLiterally. Expand
 /// the base addrec, which is the addrec without any non-loop-dominating
 /// values, and return the PHI.
@@ -1241,11 +1213,10 @@ SCEVExpander::getAddRecExprPHILiterally(const SCEVAddRecExpr *Normalized,
       IVIncInsertPos : Pred->getTerminator();
     Builder.SetInsertPoint(InsertPos);
     Value *IncV = expandIVInc(PN, StepV, L, ExpandTy, IntTy, useSubtract);
-
     if (isa<OverflowingBinaryOperator>(IncV)) {
-      if (IsIncrementNUW(SE, Normalized))
+      if (Normalized->getNoWrapFlags(SCEV::FlagNUW))
         cast<BinaryOperator>(IncV)->setHasNoUnsignedWrap();
-      if (IsIncrementNSW(SE, Normalized))
+      if (Normalized->getNoWrapFlags(SCEV::FlagNSW))
         cast<BinaryOperator>(IncV)->setHasNoSignedWrap();
     }
     PN->addIncoming(IncV, Pred);

diff --git a/llvm/test/Analysis/ScalarEvolution/scev-expander-incorrect-nowrap.ll b/llvm/test/Analysis/ScalarEvolution/scev-expander-incorrect-nowrap.ll
deleted file mode 100644 (file)
index 012cad7..0000000
--- a/llvm/test/Analysis/ScalarEvolution/scev-expander-incorrect-nowrap.ll
+++ /dev/null
@@ -1,30 +0,0 @@
-; RUN: opt -indvars -S < %s | FileCheck %s
-
-declare void @use(i32)
-declare void @use.i8(i8)
-
-define void @f() {
-; CHECK-LABEL: @f
- entry:
-  br label %loop
-
- loop:
-; The only use for idx.mirror is to induce an nuw for %idx.  It does
-; not induce an nuw for %idx.inc
-  %idx.mirror = phi i8 [ -6, %entry ], [ %idx.mirror.inc, %loop ]
-  %idx = phi i8 [ -5, %entry ], [ %idx.inc, %loop ]
-
-  %idx.sext = sext i8 %idx to i32
-  call void @use(i32 %idx.sext)
-
-  %idx.mirror.inc = add nuw i8 %idx.mirror, 1
-  call void @use.i8(i8 %idx.mirror.inc)
-
-  %idx.inc = add i8 %idx, 1
-; CHECK-NOT: %indvars.iv.next = add nuw nsw i32 %indvars.iv, 1
-  %cmp = icmp ugt i8 %idx.inc, 0
-  br i1 %cmp, label %loop, label %exit
-
- exit:
-  ret void
-}

diff --git a/llvm/test/Analysis/ScalarEvolution/zext-signed-addrec.ll b/llvm/test/Analysis/ScalarEvolution/zext-signed-addrec.ll
index 4369820..27aed3b 100644 (file)
--- a/llvm/test/Analysis/ScalarEvolution/zext-signed-addrec.ll
+++ b/llvm/test/Analysis/ScalarEvolution/zext-signed-addrec.ll
@@ -43,7 +43,7 @@ if.end:                                           ; preds = %if.end, %for.cond1.
   %shl = and i32 %conv7, 510
   store i32 %shl, i32* @c, align 4
 
-; CHECK: %lsr.iv.next = add nsw i32 %lsr.iv, -258
+; CHECK: %lsr.iv.next = add i32 %lsr.iv, -258
   %dec = add i8 %2, -1
 
   %cmp2 = icmp sgt i8 %dec, -1

diff --git a/llvm/test/CodeGen/AArch64/arm64-scaled_iv.ll b/llvm/test/CodeGen/AArch64/arm64-scaled_iv.ll
index 987373e..63428df 100644 (file)
--- a/llvm/test/CodeGen/AArch64/arm64-scaled_iv.ll
+++ b/llvm/test/CodeGen/AArch64/arm64-scaled_iv.ll
@@ -20,7 +20,7 @@ for.body:                                         ; preds = %for.body, %entry
   %arrayidx = getelementptr inbounds double* %b, i64 %tmp
   %tmp1 = load double* %arrayidx, align 8
 ; The induction variable should carry the scaling factor: 1 * 8 = 8.
-; CHECK: [[IVNEXT]] = add nuw nsw i64 [[IV]], 8
+; CHECK: [[IVNEXT]] = add nuw i64 [[IV]], 8
   %indvars.iv.next = add i64 %indvars.iv, 1
   %arrayidx2 = getelementptr inbounds double* %c, i64 %indvars.iv.next
   %tmp2 = load double* %arrayidx2, align 8

diff --git a/llvm/test/CodeGen/X86/avoid_complex_am.ll b/llvm/test/CodeGen/X86/avoid_complex_am.ll
index 7f09519..e5e7bd2 100644 (file)
--- a/llvm/test/CodeGen/X86/avoid_complex_am.ll
+++ b/llvm/test/CodeGen/X86/avoid_complex_am.ll
@@ -22,7 +22,7 @@ for.body:                                         ; preds = %for.body, %entry
   %arrayidx = getelementptr inbounds double* %b, i64 %tmp
   %tmp1 = load double* %arrayidx, align 8
 ; The induction variable should carry the scaling factor: 1.
-; CHECK: [[IVNEXT]] = add nuw nsw i64 [[IV]], 1
+; CHECK: [[IVNEXT]] = add nuw i64 [[IV]], 1
   %indvars.iv.next = add i64 %indvars.iv, 1
   %arrayidx2 = getelementptr inbounds double* %c, i64 %indvars.iv.next
   %tmp2 = load double* %arrayidx2, align 8

diff --git a/llvm/test/Transforms/IndVarSimplify/overflowcheck.ll b/llvm/test/Transforms/IndVarSimplify/overflowcheck.ll
index 3864c6c..2603f36 100644 (file)
--- a/llvm/test/Transforms/IndVarSimplify/overflowcheck.ll
+++ b/llvm/test/Transforms/IndVarSimplify/overflowcheck.ll
@@ -9,7 +9,7 @@ target triple = "x86_64-apple-macosx"
 ; CHECK: @llvm.sadd.with.overflow
 ; CHECK-LABEL: loop2:
 ; CHECK-NOT: extractvalue
-; CHECK: add nuw
+; CHECK: add nuw nsw
 ; CHECK: @llvm.sadd.with.overflow
 ; CHECK-LABEL: loop3:
 ; CHECK-NOT: extractvalue

diff --git a/llvm/test/Transforms/IndVarSimplify/pr20680.ll b/llvm/test/Transforms/IndVarSimplify/pr20680.ll
index 716e013..88a7fd7 100644 (file)
--- a/llvm/test/Transforms/IndVarSimplify/pr20680.ll
+++ b/llvm/test/Transforms/IndVarSimplify/pr20680.ll
@@ -204,8 +204,8 @@ for.cond2.for.inc13_crit_edge:                    ; preds = %for.cond2.for.inc13
   br label %for.inc13
 
 ; CHECK: [[for_inc13]]:
-; CHECK-NEXT: %[[indvars_iv_next]] = add nsw i32 %[[indvars_iv]], 1
-; CHECK-NEXT: %[[exitcond4:.*]] = icmp ne i32 %[[indvars_iv_next]], 0
+; CHECK-NEXT: %[[indvars_iv_next]] = add nuw nsw i32 %[[indvars_iv]], 1
+; CHECK-NEXT: %[[exitcond4:.*]] = icmp ne i32 %[[indvars_iv]], -1
 ; CHECK-NEXT: br i1 %[[exitcond4]], label %[[for_cond2_preheader]], label %[[for_end15:.*]]
 for.inc13:                                        ; preds = %for.cond2.for.inc13_crit_edge, %for.cond2.preheader
   %inc14 = add i8 %storemerge15, 1

diff --git a/llvm/test/Transforms/LoopStrengthReduce/count-to-zero.ll b/llvm/test/Transforms/LoopStrengthReduce/count-to-zero.ll
index 0e96f02..feb79f8 100644 (file)
--- a/llvm/test/Transforms/LoopStrengthReduce/count-to-zero.ll
+++ b/llvm/test/Transforms/LoopStrengthReduce/count-to-zero.ll
@@ -19,7 +19,7 @@ bb3:                                              ; preds = %bb1
   %tmp4 = add i32 %c_addr.1, -1                   ; <i32> [#uses=1]
   %c_addr.1.be = select i1 %tmp2, i32 %tmp3, i32 %tmp4 ; <i32> [#uses=1]
   %indvar.next = add i32 %indvar, 1               ; <i32> [#uses=1]
-; CHECK: add nsw i32 %lsr.iv, -1
+; CHECK: add i32 %lsr.iv, -1
   br label %bb6
 
 bb6:                                              ; preds = %bb3, %entry

diff --git a/llvm/test/Transforms/LoopStrengthReduce/uglygep.ll b/llvm/test/Transforms/LoopStrengthReduce/uglygep.ll
index 5155087..4562d29 100644 (file)
--- a/llvm/test/Transforms/LoopStrengthReduce/uglygep.ll
+++ b/llvm/test/Transforms/LoopStrengthReduce/uglygep.ll
@@ -59,7 +59,7 @@ bb:
 ; CHECK: loop0:
 ; Induction variable is initialized to -2.
 ; CHECK-NEXT: [[PHIIV:%[^ ]+]] = phi i32 [ [[IVNEXT:%[^ ]+]], %loop0 ], [ -2, %bb ]
-; CHECK-NEXT: [[IVNEXT]] = add nuw nsw i32 [[PHIIV]], 1
+; CHECK-NEXT: [[IVNEXT]] = add i32 [[PHIIV]], 1
 ; CHECK-NEXT: br i1 false, label %loop0, label %bb0
 loop0:                                            ; preds = %loop0, %bb
   %i0 = phi i32 [ %i0.next, %loop0 ], [ 0, %bb ]  ; <i32> [#uses=2]