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clang-p2996/llvm/test/Analysis/ScalarEvolution/exit-count-select.ll
Florian Hahn 8a3efcd40b [ValueTracking] Consider single poison operands in propgatesPoison. 
This patch updates propgatesPoison to take a Use as argument and
propagatesPoison now returns true if the passed in operand causes the
user to yield poison if the operand is poison

This allows propagating poison if the condition of a select is poison.
This helps improve results for programUndefinedIfUndefOrPoison.

Reviewed By: nikic

Differential Revision: https://reviews.llvm.org/D111643
2022-12-19 11:47:51 +00:00

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; NOTE: Assertions have been autogenerated by utils/update_analyze_test_checks.py
; RUN: opt -disable-output "-passes=print<scalar-evolution>" %s 2>&1 | FileCheck %s
; If m is constant, exact-not-taken is umin(n, m)
; https://alive2.llvm.org/ce/z/ZTNXgY
define void @logical_and_m_const(i32 %n) {
; CHECK-LABEL: 'logical_and_m_const'
; CHECK-NEXT: Classifying expressions for: @logical_and_m_const
; CHECK-NEXT: %i = phi i32 [ 0, %entry ], [ %i.next, %loop ]
; CHECK-NEXT: --> {0,+,1}<%loop> U: [0,3) S: [0,3) Exits: (2 umin %n) LoopDispositions: { %loop: Computable }
; CHECK-NEXT: %i.next = add i32 %i, 1
; CHECK-NEXT: --> {1,+,1}<%loop> U: [1,4) S: [1,4) Exits: (1 + (2 umin %n))<nuw><nsw> LoopDispositions: { %loop: Computable }
; CHECK-NEXT: %cond = select i1 %cond_i, i1 %cond_i2, i1 false
; CHECK-NEXT: --> (%cond_i2 umin %cond_i) U: full-set S: full-set Exits: <<Unknown>> LoopDispositions: { %loop: Variant }
; CHECK-NEXT: Determining loop execution counts for: @logical_and_m_const
; CHECK-NEXT: Loop %loop: backedge-taken count is (2 umin %n)
; CHECK-NEXT: Loop %loop: constant max backedge-taken count is 2
; CHECK-NEXT: Loop %loop: symbolic max backedge-taken count is (2 umin %n)
; CHECK-NEXT: Loop %loop: Predicated backedge-taken count is (2 umin %n)
; CHECK-NEXT: Predicates:
; CHECK: Loop %loop: Trip multiple is 1
;
entry:
br label %loop
loop:
%i = phi i32 [0, %entry], [%i.next, %loop]
%i.next = add i32 %i, 1
%cond_i = icmp ult i32 %i, %n
%cond_i2 = icmp ult i32 %i, 2
%cond = select i1 %cond_i, i1 %cond_i2, i1 false
br i1 %cond, label %loop, label %exit
exit:
ret void
}
; exact-not-taken is umin(2, m) because m participates in the exit branch condition.
; https://alive2.llvm.org/ce/z/rCVMmp
define void @logical_and_nonzero(i32 %m) {
; CHECK-LABEL: 'logical_and_nonzero'
; CHECK-NEXT: Classifying expressions for: @logical_and_nonzero
; CHECK-NEXT: %i = phi i32 [ 0, %entry ], [ %i.next, %loop ]
; CHECK-NEXT: --> {0,+,1}<%loop> U: [0,3) S: [0,3) Exits: (2 umin %m) LoopDispositions: { %loop: Computable }
; CHECK-NEXT: %i.next = add i32 %i, 1
; CHECK-NEXT: --> {1,+,1}<%loop> U: [1,4) S: [1,4) Exits: (1 + (2 umin %m))<nuw><nsw> LoopDispositions: { %loop: Computable }
; CHECK-NEXT: %cond = select i1 %cond_i, i1 %cond_i2, i1 false
; CHECK-NEXT: --> (%cond_i umin_seq %cond_i2) U: full-set S: full-set Exits: <<Unknown>> LoopDispositions: { %loop: Variant }
; CHECK-NEXT: Determining loop execution counts for: @logical_and_nonzero
; CHECK-NEXT: Loop %loop: backedge-taken count is (2 umin %m)
; CHECK-NEXT: Loop %loop: constant max backedge-taken count is 2
; CHECK-NEXT: Loop %loop: symbolic max backedge-taken count is (2 umin %m)
; CHECK-NEXT: Loop %loop: Predicated backedge-taken count is (2 umin %m)
; CHECK-NEXT: Predicates:
; CHECK: Loop %loop: Trip multiple is 1
;
entry:
br label %loop
loop:
%i = phi i32 [0, %entry], [%i.next, %loop]
%i.next = add i32 %i, 1
%cond_i = icmp ult i32 %i, 2
%cond_i2 = icmp ult i32 %i, %m
%cond = select i1 %cond_i, i1 %cond_i2, i1 false
br i1 %cond, label %loop, label %exit
exit:
ret void
}
; exact-not-taken cannot be umin(0, m) because m never participates in the exit branch condition.
; https://alive2.llvm.org/ce/z/rlaN4a
; Instead, it should be just 0.
define void @logical_and_zero(i32 %m) {
; CHECK-LABEL: 'logical_and_zero'
; CHECK-NEXT: Classifying expressions for: @logical_and_zero
; CHECK-NEXT: %i = phi i32 [ 0, %entry ], [ %i.next, %loop ]
; CHECK-NEXT: --> {0,+,1}<%loop> U: [0,1) S: [0,1) Exits: 0 LoopDispositions: { %loop: Computable }
; CHECK-NEXT: %i.next = add i32 %i, 1
; CHECK-NEXT: --> {1,+,1}<%loop> U: [1,2) S: [1,2) Exits: 1 LoopDispositions: { %loop: Computable }
; CHECK-NEXT: %cond = select i1 %cond_i, i1 %cond_i2, i1 false
; CHECK-NEXT: --> (%cond_i umin_seq %cond_i2) U: full-set S: full-set Exits: false LoopDispositions: { %loop: Variant }
; CHECK-NEXT: Determining loop execution counts for: @logical_and_zero
; CHECK-NEXT: Loop %loop: backedge-taken count is 0
; CHECK-NEXT: Loop %loop: constant max backedge-taken count is 0
; CHECK-NEXT: Loop %loop: symbolic max backedge-taken count is 0
; CHECK-NEXT: Loop %loop: Predicated backedge-taken count is 0
; CHECK-NEXT: Predicates:
; CHECK: Loop %loop: Trip multiple is 1
;
entry:
br label %loop
loop:
%i = phi i32 [0, %entry], [%i.next, %loop]
%i.next = add i32 %i, 1
%cond_i = icmp ult i32 %i, 0
%cond_i2 = icmp ult i32 %i, %m
%cond = select i1 %cond_i, i1 %cond_i2, i1 false
br i1 %cond, label %loop, label %exit
exit:
ret void
}
; exact-not-taken is umax(n, m) because both conditions (cond_i, cond_i2) participate in branching,
; preventing them from being poison.
; https://alive2.llvm.org/ce/z/8_p-zu
; Currently SCEV is conservative in this case and simply returns unknown.
define void @logical_and_inversed(i32 %n, i32 %m) {
; CHECK-LABEL: 'logical_and_inversed'
; CHECK-NEXT: Classifying expressions for: @logical_and_inversed
; CHECK-NEXT: %i = phi i32 [ 0, %entry ], [ %i.next, %loop ]
; CHECK-NEXT: --> {0,+,1}<%loop> U: full-set S: full-set Exits: <<Unknown>> LoopDispositions: { %loop: Computable }
; CHECK-NEXT: %i.next = add i32 %i, 1
; CHECK-NEXT: --> {1,+,1}<%loop> U: full-set S: full-set Exits: <<Unknown>> LoopDispositions: { %loop: Computable }
; CHECK-NEXT: %cond = select i1 %cond_i, i1 %cond_i2, i1 false
; CHECK-NEXT: --> (%cond_i umin_seq %cond_i2) U: full-set S: full-set Exits: <<Unknown>> LoopDispositions: { %loop: Variant }
; CHECK-NEXT: Determining loop execution counts for: @logical_and_inversed
; CHECK-NEXT: Loop %loop: Unpredictable backedge-taken count.
; CHECK-NEXT: Loop %loop: Unpredictable constant max backedge-taken count.
; CHECK-NEXT: Loop %loop: Unpredictable symbolic max backedge-taken count.
; CHECK-NEXT: Loop %loop: Unpredictable predicated backedge-taken count.
;
entry:
br label %loop
loop:
%i = phi i32 [0, %entry], [%i.next, %loop]
%i.next = add i32 %i, 1
%cond_i = icmp uge i32 %i, %n
%cond_i2 = icmp uge i32 %i, %m
%cond = select i1 %cond_i, i1 %cond_i2, i1 false
br i1 %cond, label %exit, label %loop
exit:
ret void
}
; If m is constant, exact-not-taken is umin(n, m)
; https://alive2.llvm.org/ce/z/RQmJiq
define void @logical_or_m_const(i32 %n) {
; CHECK-LABEL: 'logical_or_m_const'
; CHECK-NEXT: Classifying expressions for: @logical_or_m_const
; CHECK-NEXT: %i = phi i32 [ 0, %entry ], [ %i.next, %loop ]
; CHECK-NEXT: --> {0,+,1}<%loop> U: [0,3) S: [0,3) Exits: (2 umin %n) LoopDispositions: { %loop: Computable }
; CHECK-NEXT: %i.next = add i32 %i, 1
; CHECK-NEXT: --> {1,+,1}<%loop> U: [1,4) S: [1,4) Exits: (1 + (2 umin %n))<nuw><nsw> LoopDispositions: { %loop: Computable }
; CHECK-NEXT: %cond = select i1 %cond_i, i1 true, i1 %cond_i2
; CHECK-NEXT: --> (true + ((true + %cond_i) umin (true + %cond_i2))) U: full-set S: full-set Exits: <<Unknown>> LoopDispositions: { %loop: Variant }
; CHECK-NEXT: Determining loop execution counts for: @logical_or_m_const
; CHECK-NEXT: Loop %loop: backedge-taken count is (2 umin %n)
; CHECK-NEXT: Loop %loop: constant max backedge-taken count is 2
; CHECK-NEXT: Loop %loop: symbolic max backedge-taken count is (2 umin %n)
; CHECK-NEXT: Loop %loop: Predicated backedge-taken count is (2 umin %n)
; CHECK-NEXT: Predicates:
; CHECK: Loop %loop: Trip multiple is 1
;
entry:
br label %loop
loop:
%i = phi i32 [0, %entry], [%i.next, %loop]
%i.next = add i32 %i, 1
%cond_i = icmp uge i32 %i, %n
%cond_i2 = icmp uge i32 %i, 2
%cond = select i1 %cond_i, i1 true, i1 %cond_i2
br i1 %cond, label %exit, label %loop
exit:
ret void
}
; exact-not-taken is umin(2, m) because m participates in exit branch condition.
; https://alive2.llvm.org/ce/z/zcHS_d
define void @logical_or_nonzero(i32 %m) {
; CHECK-LABEL: 'logical_or_nonzero'
; CHECK-NEXT: Classifying expressions for: @logical_or_nonzero
; CHECK-NEXT: %i = phi i32 [ 0, %entry ], [ %i.next, %loop ]
; CHECK-NEXT: --> {0,+,1}<%loop> U: [0,3) S: [0,3) Exits: (2 umin %m) LoopDispositions: { %loop: Computable }
; CHECK-NEXT: %i.next = add i32 %i, 1
; CHECK-NEXT: --> {1,+,1}<%loop> U: [1,4) S: [1,4) Exits: (1 + (2 umin %m))<nuw><nsw> LoopDispositions: { %loop: Computable }
; CHECK-NEXT: %cond = select i1 %cond_i, i1 true, i1 %cond_i2
; CHECK-NEXT: --> (true + ((true + %cond_i) umin_seq (true + %cond_i2))) U: full-set S: full-set Exits: <<Unknown>> LoopDispositions: { %loop: Variant }
; CHECK-NEXT: Determining loop execution counts for: @logical_or_nonzero
; CHECK-NEXT: Loop %loop: backedge-taken count is (2 umin %m)
; CHECK-NEXT: Loop %loop: constant max backedge-taken count is 2
; CHECK-NEXT: Loop %loop: symbolic max backedge-taken count is (2 umin %m)
; CHECK-NEXT: Loop %loop: Predicated backedge-taken count is (2 umin %m)
; CHECK-NEXT: Predicates:
; CHECK: Loop %loop: Trip multiple is 1
;
entry:
br label %loop
loop:
%i = phi i32 [0, %entry], [%i.next, %loop]
%i.next = add i32 %i, 1
%cond_i = icmp uge i32 %i, 2
%cond_i2 = icmp uge i32 %i, %m
%cond = select i1 %cond_i, i1 true, i1 %cond_i2
br i1 %cond, label %exit, label %loop
exit:
ret void
}
; exact-not-taken cannot be umin(0, m) because m does not participate in exit branch condition.
; https://alive2.llvm.org/ce/z/-dUmmc
; Instead, exact-not-taken should be just 0.
define void @logical_or_zero(i32 %m) {
; CHECK-LABEL: 'logical_or_zero'
; CHECK-NEXT: Classifying expressions for: @logical_or_zero
; CHECK-NEXT: %i = phi i32 [ 0, %entry ], [ %i.next, %loop ]
; CHECK-NEXT: --> {0,+,1}<%loop> U: [0,1) S: [0,1) Exits: 0 LoopDispositions: { %loop: Computable }
; CHECK-NEXT: %i.next = add i32 %i, 1
; CHECK-NEXT: --> {1,+,1}<%loop> U: [1,2) S: [1,2) Exits: 1 LoopDispositions: { %loop: Computable }
; CHECK-NEXT: %cond = select i1 %cond_i, i1 true, i1 %cond_i2
; CHECK-NEXT: --> (true + ((true + %cond_i) umin_seq (true + %cond_i2))) U: full-set S: full-set Exits: true LoopDispositions: { %loop: Variant }
; CHECK-NEXT: Determining loop execution counts for: @logical_or_zero
; CHECK-NEXT: Loop %loop: backedge-taken count is 0
; CHECK-NEXT: Loop %loop: constant max backedge-taken count is 0
; CHECK-NEXT: Loop %loop: symbolic max backedge-taken count is 0
; CHECK-NEXT: Loop %loop: Predicated backedge-taken count is 0
; CHECK-NEXT: Predicates:
; CHECK: Loop %loop: Trip multiple is 1
;
entry:
br label %loop
loop:
%i = phi i32 [0, %entry], [%i.next, %loop]
%i.next = add i32 %i, 1
%cond_i = icmp uge i32 %i, 0
%cond_i2 = icmp uge i32 %i, %m
%cond = select i1 %cond_i, i1 true, i1 %cond_i2
br i1 %cond, label %exit, label %loop
exit:
ret void
}
; exact-not-taken is umax(n, m) because both conditions (cond_i, cond_i2) participate in branching,
; preventing them from being poison.
; https://alive2.llvm.org/ce/z/VaCu9C
; Currently SCEV is conservative in this case and simply returns unknown.
define void @logical_or_inversed(i32 %n, i32 %m) {
; CHECK-LABEL: 'logical_or_inversed'
; CHECK-NEXT: Classifying expressions for: @logical_or_inversed
; CHECK-NEXT: %i = phi i32 [ 0, %entry ], [ %i.next, %loop ]
; CHECK-NEXT: --> {0,+,1}<%loop> U: full-set S: full-set Exits: <<Unknown>> LoopDispositions: { %loop: Computable }
; CHECK-NEXT: %i.next = add i32 %i, 1
; CHECK-NEXT: --> {1,+,1}<%loop> U: full-set S: full-set Exits: <<Unknown>> LoopDispositions: { %loop: Computable }
; CHECK-NEXT: %cond = select i1 %cond_i, i1 true, i1 %cond_i2
; CHECK-NEXT: --> (true + ((true + %cond_i) umin_seq (true + %cond_i2))) U: full-set S: full-set Exits: <<Unknown>> LoopDispositions: { %loop: Variant }
; CHECK-NEXT: Determining loop execution counts for: @logical_or_inversed
; CHECK-NEXT: Loop %loop: Unpredictable backedge-taken count.
; CHECK-NEXT: Loop %loop: Unpredictable constant max backedge-taken count.
; CHECK-NEXT: Loop %loop: Unpredictable symbolic max backedge-taken count.
; CHECK-NEXT: Loop %loop: Unpredictable predicated backedge-taken count.
;
entry:
br label %loop
loop:
%i = phi i32 [0, %entry], [%i.next, %loop]
%i.next = add i32 %i, 1
%cond_i = icmp ult i32 %i, %n
%cond_i2 = icmp ult i32 %i, %m
%cond = select i1 %cond_i, i1 true, i1 %cond_i2
br i1 %cond, label %loop, label %exit
exit:
ret void
}
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