1*9880d681SAndroid Build Coastguard Worker; RUN: llc -march=hexagon -mcpu=hexagonv5 -enable-pipeliner -verify-machineinstrs < %s | FileCheck %s 2*9880d681SAndroid Build Coastguard Worker 3*9880d681SAndroid Build Coastguard Worker; If the trip count is a compile-time constant, then decrement it instead 4*9880d681SAndroid Build Coastguard Worker; of computing a new LC0 value. 5*9880d681SAndroid Build Coastguard Worker 6*9880d681SAndroid Build Coastguard Worker; CHECK-LABEL: @test 7*9880d681SAndroid Build Coastguard Worker; CHECK: loop0(.LBB0_1, #998) 8*9880d681SAndroid Build Coastguard Worker 9*9880d681SAndroid Build Coastguard Workerdefine i32 @test(i32* %A, i32* %B, i32 %count) { 10*9880d681SAndroid Build Coastguard Workerentry: 11*9880d681SAndroid Build Coastguard Worker br label %for.body 12*9880d681SAndroid Build Coastguard Worker 13*9880d681SAndroid Build Coastguard Workerfor.body: 14*9880d681SAndroid Build Coastguard Worker %sum.02 = phi i32 [ 0, %entry ], [ %add, %for.body ] 15*9880d681SAndroid Build Coastguard Worker %arrayidx.phi = phi i32* [ %A, %entry ], [ %arrayidx.inc, %for.body ] 16*9880d681SAndroid Build Coastguard Worker %i.01 = phi i32 [ 0, %entry ], [ %inc, %for.body ] 17*9880d681SAndroid Build Coastguard Worker %0 = load i32, i32* %arrayidx.phi, align 4 18*9880d681SAndroid Build Coastguard Worker %add = add nsw i32 %0, %sum.02 19*9880d681SAndroid Build Coastguard Worker %inc = add nsw i32 %i.01, 1 20*9880d681SAndroid Build Coastguard Worker %exitcond = icmp eq i32 %inc, 1000 21*9880d681SAndroid Build Coastguard Worker %arrayidx.inc = getelementptr i32, i32* %arrayidx.phi, i32 1 22*9880d681SAndroid Build Coastguard Worker br i1 %exitcond, label %for.end, label %for.body 23*9880d681SAndroid Build Coastguard Worker 24*9880d681SAndroid Build Coastguard Workerfor.end: 25*9880d681SAndroid Build Coastguard Worker ret i32 %add 26*9880d681SAndroid Build Coastguard Worker} 27*9880d681SAndroid Build Coastguard Worker 28*9880d681SAndroid Build Coastguard Worker; The constant trip count is small enough that the kernel is not executed. 29*9880d681SAndroid Build Coastguard Worker 30*9880d681SAndroid Build Coastguard Worker; CHECK-LABEL: @test1 31*9880d681SAndroid Build Coastguard Worker; CHECK-NOT: loop0( 32*9880d681SAndroid Build Coastguard Worker 33*9880d681SAndroid Build Coastguard Workerdefine i32 @test1(i32* %A, i32* %B, i32 %count) { 34*9880d681SAndroid Build Coastguard Workerentry: 35*9880d681SAndroid Build Coastguard Worker br label %for.body 36*9880d681SAndroid Build Coastguard Worker 37*9880d681SAndroid Build Coastguard Workerfor.body: 38*9880d681SAndroid Build Coastguard Worker %sum.02 = phi i32 [ 0, %entry ], [ %add, %for.body ] 39*9880d681SAndroid Build Coastguard Worker %arrayidx.phi = phi i32* [ %A, %entry ], [ %arrayidx.inc, %for.body ] 40*9880d681SAndroid Build Coastguard Worker %i.01 = phi i32 [ 0, %entry ], [ %inc, %for.body ] 41*9880d681SAndroid Build Coastguard Worker %0 = load i32, i32* %arrayidx.phi, align 4 42*9880d681SAndroid Build Coastguard Worker %add = add nsw i32 %0, %sum.02 43*9880d681SAndroid Build Coastguard Worker %inc = add nsw i32 %i.01, 1 44*9880d681SAndroid Build Coastguard Worker %exitcond = icmp eq i32 %inc, 1 45*9880d681SAndroid Build Coastguard Worker %arrayidx.inc = getelementptr i32, i32* %arrayidx.phi, i32 1 46*9880d681SAndroid Build Coastguard Worker br i1 %exitcond, label %for.end, label %for.body 47*9880d681SAndroid Build Coastguard Worker 48*9880d681SAndroid Build Coastguard Workerfor.end: 49*9880d681SAndroid Build Coastguard Worker ret i32 %add 50*9880d681SAndroid Build Coastguard Worker} 51*9880d681SAndroid Build Coastguard Worker 52