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