1; RUN: opt < %s -S -analyze -enable-new-pm=0 -scalar-evolution | FileCheck %s 2; RUN: opt < %s -S -disable-output "-passes=print<scalar-evolution>" 2>&1 | FileCheck %s 3 4; ScalarEvolution should be able to fold away the sign-extensions 5; on this loop with a primary induction variable incremented with 6; a nsw add of 2. 7 8target 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" 9 10define void @foo(i32 %no, double* nocapture %d, double* nocapture %q) nounwind { 11entry: 12 %n = and i32 %no, 4294967294 13 %0 = icmp sgt i32 %n, 0 ; <i1> [#uses=1] 14 br i1 %0, label %bb.nph, label %return 15 16bb.nph: ; preds = %entry 17 br label %bb 18 19bb: ; preds = %bb.nph, %bb1 20 %i.01 = phi i32 [ %16, %bb1 ], [ 0, %bb.nph ] ; <i32> [#uses=5] 21 22; CHECK: %1 = sext i32 %i.01 to i64 23; CHECK: --> {0,+,2}<nuw><nsw><%bb> 24 %1 = sext i32 %i.01 to i64 ; <i64> [#uses=1] 25 26; CHECK: %2 = getelementptr inbounds double, double* %d, i64 %1 27; CHECK: --> {%d,+,16}<nuw><%bb> 28 %2 = getelementptr inbounds double, double* %d, i64 %1 ; <double*> [#uses=1] 29 30 %3 = load double, double* %2, align 8 ; <double> [#uses=1] 31 %4 = sext i32 %i.01 to i64 ; <i64> [#uses=1] 32 %5 = getelementptr inbounds double, double* %q, i64 %4 ; <double*> [#uses=1] 33 %6 = load double, double* %5, align 8 ; <double> [#uses=1] 34 %7 = or i32 %i.01, 1 ; <i32> [#uses=1] 35 36; CHECK: %8 = sext i32 %7 to i64 37; CHECK: --> {1,+,2}<nuw><nsw><%bb> 38 %8 = sext i32 %7 to i64 ; <i64> [#uses=1] 39 40; CHECK: %9 = getelementptr inbounds double, double* %q, i64 %8 41; CHECK: {(8 + %q)<nuw>,+,16}<nuw><%bb> 42 %9 = getelementptr inbounds double, double* %q, i64 %8 ; <double*> [#uses=1] 43 44; Artificially repeat the above three instructions, this time using 45; add nsw instead of or. 46 %t7 = add nsw i32 %i.01, 1 ; <i32> [#uses=1] 47 48; CHECK: %t8 = sext i32 %t7 to i64 49; CHECK: --> {1,+,2}<nuw><nsw><%bb> 50 %t8 = sext i32 %t7 to i64 ; <i64> [#uses=1] 51 52; CHECK: %t9 = getelementptr inbounds double, double* %q, i64 %t8 53; CHECK: {(8 + %q)<nuw>,+,16}<nuw><%bb> 54 %t9 = getelementptr inbounds double, double* %q, i64 %t8 ; <double*> [#uses=1] 55 56 %10 = load double, double* %9, align 8 ; <double> [#uses=1] 57 %11 = fadd double %6, %10 ; <double> [#uses=1] 58 %12 = fadd double %11, 3.200000e+00 ; <double> [#uses=1] 59 %13 = fmul double %3, %12 ; <double> [#uses=1] 60 %14 = sext i32 %i.01 to i64 ; <i64> [#uses=1] 61 %15 = getelementptr inbounds double, double* %d, i64 %14 ; <double*> [#uses=1] 62 store double %13, double* %15, align 8 63 %16 = add nsw i32 %i.01, 2 ; <i32> [#uses=2] 64 br label %bb1 65 66bb1: ; preds = %bb 67 %17 = icmp slt i32 %16, %n ; <i1> [#uses=1] 68 br i1 %17, label %bb, label %bb1.return_crit_edge 69 70bb1.return_crit_edge: ; preds = %bb1 71 br label %return 72 73return: ; preds = %bb1.return_crit_edge, %entry 74 ret void 75} 76 77; CHECK: Loop %bb: backedge-taken count is ((-1 + (2 * (%no /u 2))<nuw>) /u 2) 78; CHECK: Loop %bb: max backedge-taken count is 1073741822 79