1; RUN: opt -loop-vectorize -S < %s 2>&1 | FileCheck %s 2 3; Produced from test-case: 4; 5; void testGuardedInnerLoop(uint32_t *ptr, uint32_t denom, uint32_t numer, uint32_t outer_lim) 6; { 7; for(uint32_t outer_i = 0; outer_i < outer_lim; ++outer_i) { 8; if (denom > 0) { 9; const uint32_t lim = numer / denom; 10; 11; for (uint32_t i = 0; i < lim; ++i) 12; ptr[i] = 1; 13; } 14; } 15; } 16 17 18target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128-ni:1" 19target triple = "x86_64-unknown-linux-gnu" 20 21define void @testGuardedInnerLoop(i32* %ptr, i32 %denom, i32 %numer, i32 %outer_lim) { 22entry: 23 %cmp1 = icmp eq i32 %outer_lim, 0 24 br i1 %cmp1, label %exit, label %loop1.preheader 25 26; Verify that a 'udiv' does not appear between the 'loop1.preheader' label, and 27; whatever label comes next. 28loop1.preheader: 29; CHECK-LABEL: loop1.preheader: 30; CHECK-NOT: udiv 31; CHECK-LABEL: : 32 br label %loop1 33 34loop1: 35 %outer_i = phi i32 [ %inc1, %loop2.exit ], [ 0, %loop1.preheader ] 36 %0 = add i32 %denom, -1 37 %1 = icmp ult i32 %0, %numer 38 br i1 %1, label %loop2.preheader, label %loop2.exit 39 40; Verify that a 'udiv' does appear between the 'loop2.preheader' label, and 41; whatever label comes next. 42loop2.preheader: 43; CHECK-LABEL: loop2.preheader: 44; CHECK: udiv 45; CHECK-LABEL: : 46 %lim = udiv i32 %numer, %denom 47 %2 = zext i32 %lim to i64 48 br label %loop2 49 50loop2: 51 %indvar.loop2 = phi i64 [ 0, %loop2.preheader ], [ %indvar.loop2.next, %loop2 ] 52 %arrayidx = getelementptr inbounds i32, i32* %ptr, i64 %indvar.loop2 53 store i32 1, i32* %arrayidx, align 4 54 %indvar.loop2.next = add nuw nsw i64 %indvar.loop2, 1 55 %cmp2 = icmp ult i64 %indvar.loop2.next, %2 56 br i1 %cmp2, label %loop2, label %loop2.exit 57 58loop2.exit: 59 %inc1 = add nuw i32 %outer_i, 1 60 %exitcond = icmp eq i32 %inc1, %outer_lim 61 br i1 %exitcond, label %exit, label %loop1 62 63exit: 64 ret void 65} 66