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Revert "[SCEV] add no wrap flag for SCEVAddExpr." #39

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merged 1 commit into from Feb 24, 2020
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Revert "[SCEV] add no wrap flag for SCEVAddExpr." #39

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2 changes: 1 addition & 1 deletion llvm/lib/Analysis/ScalarEvolution.cpp
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Expand Up @@ -4991,7 +4991,7 @@ const SCEV *ScalarEvolution::createSimpleAffineAddRec(PHINode *PN,
// overflow.
if (auto *BEInst = dyn_cast<Instruction>(BEValueV))
if (isLoopInvariant(Accum, L) && isAddRecNeverPoison(BEInst, L))
(void)getAddRecExpr(getAddExpr(StartVal, Accum, Flags), Accum, L, Flags);
(void)getAddRecExpr(getAddExpr(StartVal, Accum), Accum, L, Flags);

return PHISCEV;
}
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2 changes: 1 addition & 1 deletion llvm/test/Analysis/ScalarEvolution/limit-depth.ll
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Expand Up @@ -46,7 +46,7 @@ define void @test_mul(i32 %a, i32 %b, i32 %c, i32 %d, i32 %e, i32 %f) {
define void @test_sext(i32 %a, i32 %b, i32 %c, i32 %d, i32 %e, i32 %f) {
; CHECK-LABEL: @test_sext
; CHECK: %se2 = sext i64 %iv2.inc to i128
; CHECK-NEXT: --> {(1 + (sext i64 {(sext i32 (1 + %a)<nsw> to i64),+,1}<nsw><%loop> to i128))<nsw>,+,1}<nsw><%loop2>
; CHECK-NEXT: --> {(1 + (sext i64 {(sext i32 (1 + %a) to i64),+,1}<nsw><%loop> to i128))<nsw>,+,1}<nsw><%loop2>
entry:
br label %loop

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2 changes: 1 addition & 1 deletion llvm/test/Analysis/ScalarEvolution/nsw.ll
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Expand Up @@ -163,7 +163,7 @@ bb5: ; preds = %bb2
declare void @f(i32)

; CHECK-LABEL: nswnowrap
; CHECK: --> {(1 + %v)<nsw>,+,1}<nsw><%for.body>{{ U: [^ ]+ S: [^ ]+}}{{ *}}Exits: (2 + %v)
; CHECK: --> {(1 + %v)<nsw>,+,1}<nsw><%for.body>{{ U: [^ ]+ S: [^ ]+}}{{ *}}Exits: (1 + ((1 + %v)<nsw> smax %v))
define void @nswnowrap(i32 %v, i32* %buf) {
entry:
%add = add nsw i32 %v, 1
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2 changes: 1 addition & 1 deletion llvm/test/Analysis/ScalarEvolution/trip-count12.ll
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@@ -1,7 +1,7 @@
; RUN: opt < %s -analyze -scalar-evolution | FileCheck %s

; CHECK: Determining loop execution counts for: @test
; CHECK: Loop %for.body: backedge-taken count is ((-2 + %len)<nsw> /u 2)
; CHECK: Loop %for.body: backedge-taken count is ((-2 + %len) /u 2)
; CHECK: Loop %for.body: max backedge-taken count is 1073741823

define zeroext i16 @test(i16* nocapture %p, i32 %len) nounwind readonly {
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8 changes: 4 additions & 4 deletions llvm/test/Analysis/ScalarEvolution/trip-count9.ll
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Expand Up @@ -179,7 +179,7 @@ exit:
}

; CHECK: Determining loop execution counts for: @nsw_startx
; CHECK: Loop %loop: backedge-taken count is (-1 + (-1 * %x) + ((1 + %x)<nsw> smax %n))
; CHECK: Loop %loop: backedge-taken count is (-1 + (-1 * %x) + ((1 + %x) smax %n))
; CHECK: Loop %loop: max backedge-taken count is -1
define void @nsw_startx(i4 %n, i4 %x) {
entry:
Expand All @@ -195,7 +195,7 @@ exit:
}

; CHECK: Determining loop execution counts for: @nsw_startx_step2
; CHECK: Loop %loop: backedge-taken count is ((-1 + (-1 * %x) + ((2 + %x)<nsw> smax %n)) /u 2)
; CHECK: Loop %loop: backedge-taken count is ((-1 + (-1 * %x) + ((2 + %x) smax %n)) /u 2)
; CHECK: Loop %loop: max backedge-taken count is 7
define void @nsw_startx_step2(i4 %n, i4 %x) {
entry:
Expand Down Expand Up @@ -381,7 +381,7 @@ exit:
}

; CHECK: Determining loop execution counts for: @even_nsw_startx
; CHECK: Loop %loop: backedge-taken count is (-1 + (-1 * %x) + ((1 + %x)<nsw> smax (2 * %n)))
; CHECK: Loop %loop: backedge-taken count is (-1 + (-1 * %x) + ((1 + %x) smax (2 * %n)))
; CHECK: Loop %loop: max backedge-taken count is -2
define void @even_nsw_startx(i4 %n, i4 %x) {
entry:
Expand All @@ -398,7 +398,7 @@ exit:
}

; CHECK: Determining loop execution counts for: @even_nsw_startx_step2
; CHECK: Loop %loop: backedge-taken count is ((-1 + (-1 * %x) + ((2 + %x)<nsw> smax (2 * %n))) /u 2)
; CHECK: Loop %loop: backedge-taken count is ((-1 + (-1 * %x) + ((2 + %x) smax (2 * %n))) /u 2)
; CHECK: Loop %loop: max backedge-taken count is 7
define void @even_nsw_startx_step2(i4 %n, i4 %x) {
entry:
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