1; RUN: opt -passes='hardware-loops<force-hardware-loops>' -S %s -o - | FileCheck %s --check-prefix=CHECK 2; RUN: opt -passes='hardware-loops<force-hardware-loops;hardware-loop-decrement=1>' -S %s -o - | FileCheck %s --check-prefix=CHECK 3; RUN: opt -passes='hardware-loops<force-hardware-loops;hardware-loop-counter-bitwidth=32>' -S %s -o - | FileCheck %s --check-prefix=CHECK 4 5define void @while_lt(i32 %i, i32 %N, ptr nocapture %A) { 6; CHECK-LABEL: @while_lt( 7; CHECK-NEXT: entry: 8; CHECK-NEXT: [[CMP4:%.*]] = icmp ult i32 [[I:%.*]], [[N:%.*]] 9; CHECK-NEXT: br i1 [[CMP4]], label [[WHILE_BODY_PREHEADER:%.*]], label [[WHILE_END:%.*]] 10; CHECK: while.body.preheader: 11; CHECK-NEXT: [[TMP0:%.*]] = sub i32 [[N]], [[I]] 12; CHECK-NEXT: call void @llvm.set.loop.iterations.i32(i32 [[TMP0]]) 13; CHECK-NEXT: br label [[WHILE_BODY:%.*]] 14; CHECK: while.body: 15; CHECK-NEXT: [[I_ADDR_05:%.*]] = phi i32 [ [[INC:%.*]], [[WHILE_BODY]] ], [ [[I]], [[WHILE_BODY_PREHEADER]] ] 16; CHECK-NEXT: [[ARRAYIDX:%.*]] = getelementptr inbounds i32, ptr [[A:%.*]], i32 [[I_ADDR_05]] 17; CHECK-NEXT: store i32 [[I_ADDR_05]], ptr [[ARRAYIDX]], align 4 18; CHECK-NEXT: [[INC]] = add nuw i32 [[I_ADDR_05]], 1 19; CHECK-NEXT: [[TMP1:%.*]] = call i1 @llvm.loop.decrement.i32(i32 1) 20; CHECK-NEXT: br i1 [[TMP1]], label [[WHILE_BODY]], label [[WHILE_END]] 21; CHECK: while.end: 22; CHECK-NEXT: ret void 23entry: 24 %cmp4 = icmp ult i32 %i, %N 25 br i1 %cmp4, label %while.body, label %while.end 26 27while.body: 28 %i.addr.05 = phi i32 [ %inc, %while.body ], [ %i, %entry ] 29 %arrayidx = getelementptr inbounds i32, ptr %A, i32 %i.addr.05 30 store i32 %i.addr.05, ptr %arrayidx, align 4 31 %inc = add nuw i32 %i.addr.05, 1 32 %exitcond = icmp eq i32 %inc, %N 33 br i1 %exitcond, label %while.end, label %while.body 34 35while.end: 36 ret void 37} 38