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- ; RUN: opt < %s -S -analyze -scalar-evolution | 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.
- 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"
- define void @foo(i32 %no, double* nocapture %d, double* nocapture %q) nounwind {
- entry:
- %n = and i32 %no, 4294967294
- %0 = icmp sgt i32 %n, 0 ; <i1> [#uses=1]
- br i1 %0, label %bb.nph, label %return
- bb.nph: ; preds = %entry
- br label %bb
- bb: ; preds = %bb.nph, %bb1
- %i.01 = phi i32 [ %16, %bb1 ], [ 0, %bb.nph ] ; <i32> [#uses=5]
- ; CHECK: %1 = sext i32 %i.01 to i64
- ; CHECK: --> {0,+,2}<nuw><nsw><%bb>
- %1 = sext i32 %i.01 to i64 ; <i64> [#uses=1]
- ; CHECK: %2 = getelementptr inbounds double, double* %d, i64 %1
- ; CHECK: --> {%d,+,16}<nsw><%bb>
- %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]
- ; CHECK: %8 = sext i32 %7 to i64
- ; CHECK: --> {1,+,2}<nuw><nsw><%bb>
- %8 = sext i32 %7 to i64 ; <i64> [#uses=1]
- ; CHECK: %9 = getelementptr inbounds double, double* %q, i64 %8
- ; CHECK: {(8 + %q),+,16}<nsw><%bb>
- %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]
- ; CHECK: %t8 = sext i32 %t7 to i64
- ; CHECK: --> {1,+,2}<nuw><nsw><%bb>
- %t8 = sext i32 %t7 to i64 ; <i64> [#uses=1]
- ; CHECK: %t9 = getelementptr inbounds double, double* %q, i64 %t8
- ; CHECK: {(8 + %q),+,16}<nsw><%bb>
- %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
- }
- ; CHECK: Loop %bb: backedge-taken count is ((-1 + (2 * (%no /u 2))) /u 2)
- ; CHECK: Loop %bb: max backedge-taken count is 1073741822
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