caio/clang-p2996
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity
Files
4794bbffb228894de3ca0dad50fc027eb94f743e
clang-p2996/llvm/test/Analysis/ScalarEvolution/incorrect-exit-count.ll
Florian Hahn 20d798bd47 Recommit "[SCEV] Look through single value PHIs." (take 3) 
This reverts commit 1fbdbb5595.

All known issues surfaced by this patch should have been fixed now.

The fixes included fixing issues with SCEV expansion in LV and DA's
reliance on LCSSA phis.
2022-06-09 15:20:10 +01:00

145 lines
9.1 KiB
LLVM
Raw Blame History

; NOTE: Assertions have been autogenerated by utils/update_analyze_test_checks.py
; RUN: opt -passes='print<scalar-evolution>' < %s -disable-output 2>&1 | FileCheck %s
@b = dso_local global i32 5, align 4
@__const.f.g = private unnamed_addr constant [1 x [4 x i16]] [[4 x i16] [i16 1, i16 0, i16 0, i16 0]], align 2
@a = common dso_local global i32 0, align 4
@c = common dso_local global i32 0, align 4
@d = common dso_local global i32 0, align 4
@e = common dso_local global i32 0, align 4
; When inner.loop is taken as an exiting block of outer.loop, we cannot use the
; addrec of %storemerge1921.3, which is {3, +, -1}<inner.loop>, to calculate the
; exit count because it doesn't belong to outer.loop.
define dso_local i32 @f() {
; CHECK-LABEL: 'f'
; CHECK-NEXT: Classifying expressions for: @f
; CHECK-NEXT: %storemerge23 = phi i32 [ 3, %entry ], [ %dec16, %for.inc13.3 ]
; CHECK-NEXT: --> {3,+,-1}<nsw><%outer.loop> U: [1,4) S: [1,4) Exits: <<Unknown>> LoopDispositions: { %outer.loop: Computable, %for.cond6: Invariant, %inner.loop: Invariant }
; CHECK-NEXT: %storemerge1921 = phi i32 [ 3, %outer.loop ], [ %dec, %for.end ]
; CHECK-NEXT: --> {3,+,-1}<nuw><nsw><%for.cond6> U: [3,4) S: [3,4) Exits: <<Unknown>> LoopDispositions: { %for.cond6: Computable, %outer.loop: Variant }
; CHECK-NEXT: %idxprom20 = zext i32 %storemerge1921 to i64
; CHECK-NEXT: --> {3,+,4294967295}<nuw><nsw><%for.cond6> U: [3,4) S: [3,4) Exits: <<Unknown>> LoopDispositions: { %for.cond6: Computable, %outer.loop: Variant }
; CHECK-NEXT: %arrayidx7 = getelementptr inbounds [1 x [4 x i16]], [1 x [4 x i16]]* @__const.f.g, i64 0, i64 0, i64 %idxprom20
; CHECK-NEXT: --> {(6 + @__const.f.g),+,8589934590}<nuw><%for.cond6> U: [0,-1) S: [-9223372036854775808,9223372036854775807) Exits: <<Unknown>> LoopDispositions: { %for.cond6: Computable, %outer.loop: Variant }
; CHECK-NEXT: %i = load i16, i16* %arrayidx7, align 2
; CHECK-NEXT: --> %i U: full-set S: full-set Exits: <<Unknown>> LoopDispositions: { %for.cond6: Variant, %outer.loop: Variant }
; CHECK-NEXT: %storemerge1822.lcssa.ph = phi i32 [ 0, %for.cond6 ]
; CHECK-NEXT: --> 0 U: [0,1) S: [0,1)
; CHECK-NEXT: %storemerge1822.lcssa.ph32 = phi i32 [ 3, %inner.loop ]
; CHECK-NEXT: --> 3 U: [3,4) S: [3,4)
; CHECK-NEXT: %storemerge1822.lcssa = phi i32 [ %storemerge1822.lcssa.ph, %if.end.loopexit ], [ %storemerge1822.lcssa.ph32, %if.end.loopexit31 ]
; CHECK-NEXT: --> %storemerge1822.lcssa U: [0,4) S: [0,4)
; CHECK-NEXT: %i1 = load i32, i32* @e, align 4
; CHECK-NEXT: --> %i1 U: full-set S: full-set
; CHECK-NEXT: %i2 = load volatile i32, i32* @b, align 4
; CHECK-NEXT: --> %i2 U: full-set S: full-set Exits: <<Unknown>> LoopDispositions: { %for.cond6: Variant, %outer.loop: Variant }
; CHECK-NEXT: %dec = add nsw i32 %storemerge1921, -1
; CHECK-NEXT: --> {2,+,-1}<nsw><%for.cond6> U: [2,3) S: [2,3) Exits: <<Unknown>> LoopDispositions: { %for.cond6: Computable, %outer.loop: Variant }
; CHECK-NEXT: %inc.lcssa.lcssa = phi i32 [ 4, %for.inc13.3 ]
; CHECK-NEXT: --> 4 U: [4,5) S: [4,5)
; CHECK-NEXT: %retval.0 = phi i32 [ %i1, %if.end ], [ 0, %cleanup.loopexit ]
; CHECK-NEXT: --> %retval.0 U: full-set S: full-set
; CHECK-NEXT: %storemerge1921.3 = phi i32 [ 3, %for.end ], [ %dec.3, %for.end.3 ]
; CHECK-NEXT: --> {3,+,-1}<nuw><nsw><%inner.loop> U: [3,4) S: [3,4) Exits: <<Unknown>> LoopDispositions: { %inner.loop: Computable, %outer.loop: Variant }
; CHECK-NEXT: %idxprom20.3 = zext i32 %storemerge1921.3 to i64
; CHECK-NEXT: --> {3,+,4294967295}<nuw><nsw><%inner.loop> U: [3,4) S: [3,4) Exits: <<Unknown>> LoopDispositions: { %inner.loop: Computable, %outer.loop: Variant }
; CHECK-NEXT: %arrayidx7.3 = getelementptr inbounds [1 x [4 x i16]], [1 x [4 x i16]]* @__const.f.g, i64 0, i64 0, i64 %idxprom20.3
; CHECK-NEXT: --> {(6 + @__const.f.g),+,8589934590}<nuw><%inner.loop> U: [0,-1) S: [-9223372036854775808,9223372036854775807) Exits: <<Unknown>> LoopDispositions: { %inner.loop: Computable, %outer.loop: Variant }
; CHECK-NEXT: %i7 = load i16, i16* %arrayidx7.3, align 2
; CHECK-NEXT: --> %i7 U: full-set S: full-set Exits: <<Unknown>> LoopDispositions: { %inner.loop: Variant, %outer.loop: Variant }
; CHECK-NEXT: %i8 = load volatile i32, i32* @b, align 4
; CHECK-NEXT: --> %i8 U: full-set S: full-set Exits: <<Unknown>> LoopDispositions: { %inner.loop: Variant, %outer.loop: Variant }
; CHECK-NEXT: %dec.3 = add nsw i32 %storemerge1921.3, -1
; CHECK-NEXT: --> {2,+,-1}<nsw><%inner.loop> U: [2,3) S: [2,3) Exits: <<Unknown>> LoopDispositions: { %inner.loop: Computable, %outer.loop: Variant }
; CHECK-NEXT: %storemerge1921.lcssa25.3 = phi i32 [ %storemerge1921.3, %for.end.3 ]
; CHECK-NEXT: --> {3,+,-1}<nuw><nsw><%inner.loop> U: [3,4) S: [3,4) Exits: <<Unknown>> LoopDispositions: { %outer.loop: Variant, %for.cond6: Variant, %inner.loop: Computable }
; CHECK-NEXT: %dec16 = add nsw i32 %storemerge23, -1
; CHECK-NEXT: --> {2,+,-1}<nsw><%outer.loop> U: [0,3) S: [0,3) Exits: <<Unknown>> LoopDispositions: { %outer.loop: Computable, %for.cond6: Invariant, %inner.loop: Invariant }
; CHECK-NEXT: Determining loop execution counts for: @f
; CHECK-NEXT: Loop %for.cond6: <multiple exits> Unpredictable backedge-taken count.
; CHECK-NEXT: exit count for for.cond6: 0
; CHECK-NEXT: exit count for for.end: ***COULDNOTCOMPUTE***
; CHECK-NEXT: Loop %for.cond6: max backedge-taken count is 0
; CHECK-NEXT: Loop %for.cond6: Unpredictable predicated backedge-taken count.
; CHECK-NEXT: Loop %inner.loop: <multiple exits> Unpredictable backedge-taken count.
; CHECK-NEXT: exit count for inner.loop: 0
; CHECK-NEXT: exit count for for.end.3: ***COULDNOTCOMPUTE***
; CHECK-NEXT: Loop %inner.loop: max backedge-taken count is 0
; CHECK-NEXT: Loop %inner.loop: Unpredictable predicated backedge-taken count.
; CHECK-NEXT: Loop %outer.loop: <multiple exits> Unpredictable backedge-taken count.
; CHECK-NEXT: exit count for for.cond6: ***COULDNOTCOMPUTE***
; CHECK-NEXT: exit count for inner.loop: ***COULDNOTCOMPUTE***
; CHECK-NEXT: exit count for for.inc13.3: 2
; CHECK-NEXT: Loop %outer.loop: max backedge-taken count is 2
; CHECK-NEXT: Loop %outer.loop: Unpredictable predicated backedge-taken count.
;
entry:
store i32 3, i32* @a, align 4
br label %outer.loop
outer.loop: ; preds = %for.inc13.3, %entry
%storemerge23 = phi i32 [ 3, %entry ], [ %dec16, %for.inc13.3 ]
br label %for.cond6
for.cond6: ; preds = %for.end, %outer.loop
%storemerge1921 = phi i32 [ 3, %outer.loop ], [ %dec, %for.end ]
%idxprom20 = zext i32 %storemerge1921 to i64
%arrayidx7 = getelementptr inbounds [1 x [4 x i16]], [1 x [4 x i16]]* @__const.f.g, i64 0, i64 0, i64 %idxprom20
%i = load i16, i16* %arrayidx7, align 2
%tobool8 = icmp eq i16 %i, 0
br i1 %tobool8, label %if.end.loopexit, label %for.end
if.end.loopexit: ; preds = %for.cond6
%storemerge1822.lcssa.ph = phi i32 [ 0, %for.cond6 ]
br label %if.end
if.end.loopexit31: ; preds = %inner.loop
%storemerge1822.lcssa.ph32 = phi i32 [ 3, %inner.loop ]
br label %if.end
if.end: ; preds = %if.end.loopexit31, %if.end.loopexit
%storemerge1822.lcssa = phi i32 [ %storemerge1822.lcssa.ph, %if.end.loopexit ], [ %storemerge1822.lcssa.ph32, %if.end.loopexit31 ]
store i32 %storemerge1822.lcssa, i32* @c, align 4
store i32 2, i32* @d, align 4
%i1 = load i32, i32* @e, align 4
br label %cleanup
for.end: ; preds = %for.cond6
%i2 = load volatile i32, i32* @b, align 4
%tobool9 = icmp eq i32 %i2, 0
%dec = add nsw i32 %storemerge1921, -1
br i1 %tobool9, label %for.cond6, label %inner.loop
cleanup.loopexit: ; preds = %for.inc13.3
%inc.lcssa.lcssa = phi i32 [ 4, %for.inc13.3 ]
store i32 %inc.lcssa.lcssa, i32* @c, align 4
br label %cleanup
cleanup: ; preds = %cleanup.loopexit, %if.end
%retval.0 = phi i32 [ %i1, %if.end ], [ 0, %cleanup.loopexit ]
ret i32 %retval.0
inner.loop: ; preds = %for.end.3, %for.end
%storemerge1921.3 = phi i32 [ 3, %for.end ], [ %dec.3, %for.end.3 ]
%idxprom20.3 = zext i32 %storemerge1921.3 to i64
%arrayidx7.3 = getelementptr inbounds [1 x [4 x i16]], [1 x [4 x i16]]* @__const.f.g, i64 0, i64 0, i64 %idxprom20.3
%i7 = load i16, i16* %arrayidx7.3, align 2
%tobool8.3 = icmp eq i16 %i7, 0
br i1 %tobool8.3, label %if.end.loopexit31, label %for.end.3
for.end.3: ; preds = %inner.loop
%i8 = load volatile i32, i32* @b, align 4
%tobool9.3 = icmp eq i32 %i8, 0
%dec.3 = add nsw i32 %storemerge1921.3, -1
br i1 %tobool9.3, label %inner.loop, label %for.inc13.3
for.inc13.3: ; preds = %for.end.3
%storemerge1921.lcssa25.3 = phi i32 [ %storemerge1921.3, %for.end.3 ]
store i32 %storemerge1921.lcssa25.3, i32* @d, align 4
%dec16 = add nsw i32 %storemerge23, -1
store i32 %dec16, i32* @a, align 4
%tobool = icmp eq i32 %dec16, 0
br i1 %tobool, label %cleanup.loopexit, label %outer.loop
}
Reference in New Issue View Git Blame Copy Permalink