1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py 2; RUN: opt -passes=loop-idiom -S %s | FileCheck %s 3 4target datalayout = "e-m:o-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128" 5target triple = "x86_64-apple-macosx11.0.0" 6 7; Make sure the number of bytes is computed correctly in the presence of zero 8; extensions and preserved add flags. 9define void @test(ptr %ptr) { 10; CHECK-LABEL: @test( 11; CHECK-NEXT: entry: 12; CHECK-NEXT: br label [[FOR_BODY_PREHEADER:%.*]] 13; CHECK: dead: 14; CHECK-NEXT: br label [[FOR_BODY_PREHEADER]] 15; CHECK: for.body.preheader: 16; CHECK-NEXT: [[LIM_0:%.*]] = phi i32 [ 65, [[ENTRY:%.*]] ], [ 1, [[DEAD:%.*]] ] 17; CHECK-NEXT: [[SCEVGEP:%.*]] = getelementptr i8, ptr [[PTR:%.*]], i64 8 18; CHECK-NEXT: [[UMAX:%.*]] = call i32 @llvm.umax.i32(i32 [[LIM_0]], i32 2) 19; CHECK-NEXT: [[TMP0:%.*]] = add nsw i32 [[UMAX]], -1 20; CHECK-NEXT: [[TMP1:%.*]] = zext nneg i32 [[TMP0]] to i64 21; CHECK-NEXT: [[TMP2:%.*]] = shl nuw nsw i64 [[TMP1]], 3 22; CHECK-NEXT: call void @llvm.memset.p0.i64(ptr align 8 [[SCEVGEP]], i8 0, i64 [[TMP2]], i1 false) 23; CHECK-NEXT: br label [[FOR_BODY:%.*]] 24; CHECK: for.body: 25; CHECK-NEXT: [[IV:%.*]] = phi i32 [ [[IV_NEXT:%.*]], [[FOR_BODY]] ], [ 1, [[FOR_BODY_PREHEADER]] ] 26; CHECK-NEXT: [[IV_EXT:%.*]] = zext i32 [[IV]] to i64 27; CHECK-NEXT: [[GEP:%.*]] = getelementptr inbounds i64, ptr [[PTR]], i64 [[IV_EXT]] 28; CHECK-NEXT: [[IV_NEXT]] = add nuw nsw i32 [[IV]], 1 29; CHECK-NEXT: [[CMP64:%.*]] = icmp ult i32 [[IV_NEXT]], [[LIM_0]] 30; CHECK-NEXT: br i1 [[CMP64]], label [[FOR_BODY]], label [[EXIT:%.*]] 31; CHECK: exit: 32; CHECK-NEXT: ret void 33; 34entry: 35 br label %for.body.preheader 36 37dead: 38 br label %for.body.preheader 39 40for.body.preheader: 41 %lim.0 = phi i32 [ 65, %entry ], [ 1, %dead ] 42 br label %for.body 43 44for.body: 45 %iv = phi i32 [ %iv.next, %for.body ], [ 1, %for.body.preheader ] 46 %iv.ext = zext i32 %iv to i64 47 %gep = getelementptr inbounds i64, ptr %ptr, i64 %iv.ext 48 store i64 0, ptr %gep, align 8 49 %iv.next = add nuw nsw i32 %iv, 1 50 %cmp64 = icmp ult i32 %iv.next, %lim.0 51 br i1 %cmp64, label %for.body, label %exit 52 53exit: 54 ret void 55} 56