1; RUN: opt < %s -debug-only=loop-vectorize -loop-vectorize -vectorizer-maximize-bandwidth -O2 -S 2>&1 | FileCheck %s 2; REQUIRES: asserts 3 4target 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-n8:16:32:64-S128" 5target triple = "x86_64-unknown-linux-gnu" 6 7@a = global [1024 x i8] zeroinitializer, align 16 8@b = global [1024 x i8] zeroinitializer, align 16 9 10define i32 @foo() { 11; This function has a loop of SAD pattern. Here we check when VF = 16 the 12; register usage doesn't exceed 16. 13; 14; CHECK-LABEL: foo 15; CHECK: LV(REG): VF = 4 16; CHECK-NEXT: LV(REG): Found max usage: 4 17; CHECK: LV(REG): VF = 8 18; CHECK-NEXT: LV(REG): Found max usage: 7 19; CHECK: LV(REG): VF = 16 20; CHECK-NEXT: LV(REG): Found max usage: 13 21 22entry: 23 br label %for.body 24 25for.cond.cleanup: 26 %add.lcssa = phi i32 [ %add, %for.body ] 27 ret i32 %add.lcssa 28 29for.body: 30 %indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ] 31 %s.015 = phi i32 [ 0, %entry ], [ %add, %for.body ] 32 %arrayidx = getelementptr inbounds [1024 x i8], [1024 x i8]* @a, i64 0, i64 %indvars.iv 33 %0 = load i8, i8* %arrayidx, align 1 34 %conv = zext i8 %0 to i32 35 %arrayidx2 = getelementptr inbounds [1024 x i8], [1024 x i8]* @b, i64 0, i64 %indvars.iv 36 %1 = load i8, i8* %arrayidx2, align 1 37 %conv3 = zext i8 %1 to i32 38 %sub = sub nsw i32 %conv, %conv3 39 %ispos = icmp sgt i32 %sub, -1 40 %neg = sub nsw i32 0, %sub 41 %2 = select i1 %ispos, i32 %sub, i32 %neg 42 %add = add nsw i32 %2, %s.015 43 %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1 44 %exitcond = icmp eq i64 %indvars.iv.next, 1024 45 br i1 %exitcond, label %for.cond.cleanup, label %for.body 46} 47 48define i64 @bar(i64* nocapture %a) { 49; CHECK-LABEL: bar 50; CHECK: LV(REG): VF = 2 51; CHECK: LV(REG): Found max usage: 4 52; 53entry: 54 br label %for.body 55 56for.cond.cleanup: 57 %add2.lcssa = phi i64 [ %add2, %for.body ] 58 ret i64 %add2.lcssa 59 60for.body: 61 %i.012 = phi i64 [ 0, %entry ], [ %inc, %for.body ] 62 %s.011 = phi i64 [ 0, %entry ], [ %add2, %for.body ] 63 %arrayidx = getelementptr inbounds i64, i64* %a, i64 %i.012 64 %0 = load i64, i64* %arrayidx, align 8 65 %add = add nsw i64 %0, %i.012 66 store i64 %add, i64* %arrayidx, align 8 67 %add2 = add nsw i64 %add, %s.011 68 %inc = add nuw nsw i64 %i.012, 1 69 %exitcond = icmp eq i64 %inc, 1024 70 br i1 %exitcond, label %for.cond.cleanup, label %for.body 71} 72