; NOTE: Assertions have been autogenerated by utils/update_analyze_test_checks.py
; RUN: opt < %s -S -disable-output "-passes=print<scalar-evolution>" 2>&1 | FileCheck %s
; ScalarEvolution should be able to fold away the sign-extensions
; on this loop with a primary induction variable incremented with
; a nsw add of 2 (this test is derived from the nsw-offset.ll test, but uses an
; assume instead of a preheader conditional branch to guard the loop).
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128"
; Note: Without the preheader assume, there is an 'smax' in the
; backedge-taken count expression:
define void @foo(i32 %no, double* nocapture %d, double* nocapture %q) nounwind {
; CHECK-LABEL: 'foo'
; CHECK-NEXT: Classifying expressions for: @foo
; CHECK-NEXT: %n = and i32 %no, -2
; CHECK-NEXT: --> (2 * (%no /u 2))<nuw> U: [0,-1) S: [-2147483648,2147483647)
; CHECK-NEXT: %i.01 = phi i32 [ %16, %bb1 ], [ 0, %bb.nph ]
; CHECK-NEXT: --> {0,+,2}<nuw><nsw><%bb> U: [0,2147483645) S: [0,2147483645) Exits: (2 * ((-1 + (2 * (%no /u 2))<nuw>) /u 2))<nuw> LoopDispositions: { %bb: Computable }
; CHECK-NEXT: %1 = sext i32 %i.01 to i64
; CHECK-NEXT: --> {0,+,2}<nuw><nsw><%bb> U: [0,2147483645) S: [0,2147483645) Exits: (2 * ((1 + (zext i32 (-2 + (2 * (%no /u 2))<nuw>) to i64))<nuw><nsw> /u 2))<nuw><nsw> LoopDispositions: { %bb: Computable }
; CHECK-NEXT: %2 = getelementptr inbounds double, double* %d, i64 %1
; CHECK-NEXT: --> {%d,+,16}<nuw><%bb> U: full-set S: full-set Exits: ((16 * ((1 + (zext i32 (-2 + (2 * (%no /u 2))<nuw>) to i64))<nuw><nsw> /u 2))<nuw><nsw> + %d) LoopDispositions: { %bb: Computable }
; CHECK-NEXT: %4 = sext i32 %i.01 to i64
; CHECK-NEXT: --> {0,+,2}<nuw><nsw><%bb> U: [0,2147483645) S: [0,2147483645) Exits: (2 * ((1 + (zext i32 (-2 + (2 * (%no /u 2))<nuw>) to i64))<nuw><nsw> /u 2))<nuw><nsw> LoopDispositions: { %bb: Computable }
; CHECK-NEXT: %5 = getelementptr inbounds double, double* %q, i64 %4
; CHECK-NEXT: --> {%q,+,16}<nuw><%bb> U: full-set S: full-set Exits: ((16 * ((1 + (zext i32 (-2 + (2 * (%no /u 2))<nuw>) to i64))<nuw><nsw> /u 2))<nuw><nsw> + %q) LoopDispositions: { %bb: Computable }
; CHECK-NEXT: %7 = or i32 %i.01, 1
; CHECK-NEXT: --> {1,+,2}<nuw><nsw><%bb> U: [1,2147483646) S: [1,2147483646) Exits: (1 + (2 * ((-1 + (2 * (%no /u 2))<nuw>) /u 2))<nuw>)<nuw><nsw> LoopDispositions: { %bb: Computable }
; CHECK-NEXT: %8 = sext i32 %7 to i64
; CHECK-NEXT: --> {1,+,2}<nuw><nsw><%bb> U: [1,2147483646) S: [1,2147483646) Exits: (1 + (2 * ((1 + (zext i32 (-2 + (2 * (%no /u 2))<nuw>) to i64))<nuw><nsw> /u 2))<nuw><nsw>)<nuw><nsw> LoopDispositions: { %bb: Computable }
; CHECK-NEXT: %9 = getelementptr inbounds double, double* %q, i64 %8
; CHECK-NEXT: --> {(8 + %q),+,16}<nuw><%bb> U: full-set S: full-set Exits: (8 + (16 * ((1 + (zext i32 (-2 + (2 * (%no /u 2))<nuw>) to i64))<nuw><nsw> /u 2))<nuw><nsw> + %q) LoopDispositions: { %bb: Computable }
; CHECK-NEXT: %t7 = add nsw i32 %i.01, 1
; CHECK-NEXT: --> {1,+,2}<nuw><nsw><%bb> U: [1,2147483646) S: [1,2147483646) Exits: (1 + (2 * ((-1 + (2 * (%no /u 2))<nuw>) /u 2))<nuw>)<nuw><nsw> LoopDispositions: { %bb: Computable }
; CHECK-NEXT: %t8 = sext i32 %t7 to i64
; CHECK-NEXT: --> {1,+,2}<nuw><nsw><%bb> U: [1,2147483646) S: [1,2147483646) Exits: (1 + (2 * ((1 + (zext i32 (-2 + (2 * (%no /u 2))<nuw>) to i64))<nuw><nsw> /u 2))<nuw><nsw>)<nuw><nsw> LoopDispositions: { %bb: Computable }
; CHECK-NEXT: %t9 = getelementptr inbounds double, double* %q, i64 %t8
; CHECK-NEXT: --> {(8 + %q),+,16}<nuw><%bb> U: full-set S: full-set Exits: (8 + (16 * ((1 + (zext i32 (-2 + (2 * (%no /u 2))<nuw>) to i64))<nuw><nsw> /u 2))<nuw><nsw> + %q) LoopDispositions: { %bb: Computable }
; CHECK-NEXT: %14 = sext i32 %i.01 to i64
; CHECK-NEXT: --> {0,+,2}<nuw><nsw><%bb> U: [0,2147483645) S: [0,2147483645) Exits: (2 * ((1 + (zext i32 (-2 + (2 * (%no /u 2))<nuw>) to i64))<nuw><nsw> /u 2))<nuw><nsw> LoopDispositions: { %bb: Computable }
; CHECK-NEXT: %15 = getelementptr inbounds double, double* %d, i64 %14
; CHECK-NEXT: --> {%d,+,16}<nuw><%bb> U: full-set S: full-set Exits: ((16 * ((1 + (zext i32 (-2 + (2 * (%no /u 2))<nuw>) to i64))<nuw><nsw> /u 2))<nuw><nsw> + %d) LoopDispositions: { %bb: Computable }
; CHECK-NEXT: %16 = add nsw i32 %i.01, 2
; CHECK-NEXT: --> {2,+,2}<nuw><nsw><%bb> U: [2,2147483647) S: [2,2147483647) Exits: (2 + (2 * ((-1 + (2 * (%no /u 2))<nuw>) /u 2))<nuw>) LoopDispositions: { %bb: Computable }
; CHECK-NEXT: Determining loop execution counts for: @foo
; CHECK-NEXT: Loop %bb: backedge-taken count is ((-1 + (2 * (%no /u 2))<nuw>) /u 2)
; CHECK-NEXT: Loop %bb: max backedge-taken count is 1073741822
; CHECK-NEXT: Loop %bb: Predicated backedge-taken count is ((-1 + (2 * (%no /u 2))<nuw>) /u 2)
; CHECK-NEXT: Predicates:
; CHECK: Loop %bb: Trip multiple is 1
;
entry:
%n = and i32 %no, 4294967294
%0 = icmp sgt i32 %n, 0 ; <i1> [#uses=1]
tail call void @llvm.assume(i1 %0)
br label %bb.nph
bb.nph: ; preds = %entry
br label %bb
bb: ; preds = %bb.nph, %bb1
%i.01 = phi i32 [ %16, %bb1 ], [ 0, %bb.nph ] ; <i32> [#uses=5]
%1 = sext i32 %i.01 to i64 ; <i64> [#uses=1]
%2 = getelementptr inbounds double, double* %d, i64 %1 ; <double*> [#uses=1]
%3 = load double, double* %2, align 8 ; <double> [#uses=1]
%4 = sext i32 %i.01 to i64 ; <i64> [#uses=1]
%5 = getelementptr inbounds double, double* %q, i64 %4 ; <double*> [#uses=1]
%6 = load double, double* %5, align 8 ; <double> [#uses=1]
%7 = or i32 %i.01, 1 ; <i32> [#uses=1]
%8 = sext i32 %7 to i64 ; <i64> [#uses=1]
%9 = getelementptr inbounds double, double* %q, i64 %8 ; <double*> [#uses=1]
; Artificially repeat the above three instructions, this time using
; add nsw instead of or.
%t7 = add nsw i32 %i.01, 1 ; <i32> [#uses=1]
%t8 = sext i32 %t7 to i64 ; <i64> [#uses=1]
%t9 = getelementptr inbounds double, double* %q, i64 %t8 ; <double*> [#uses=1]
%10 = load double, double* %9, align 8 ; <double> [#uses=1]
%11 = fadd double %6, %10 ; <double> [#uses=1]
%12 = fadd double %11, 3.200000e+00 ; <double> [#uses=1]
%13 = fmul double %3, %12 ; <double> [#uses=1]
%14 = sext i32 %i.01 to i64 ; <i64> [#uses=1]
%15 = getelementptr inbounds double, double* %d, i64 %14 ; <double*> [#uses=1]
store double %13, double* %15, align 8
%16 = add nsw i32 %i.01, 2 ; <i32> [#uses=2]
br label %bb1
bb1: ; preds = %bb
%17 = icmp slt i32 %16, %n ; <i1> [#uses=1]
br i1 %17, label %bb, label %bb1.return_crit_edge
bb1.return_crit_edge: ; preds = %bb1
br label %return
return: ; preds = %bb1.return_crit_edge, %entry
ret void
}
declare void @llvm.assume(i1) nounwind