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; RUN: llc -march=hexagon -mcpu=hexagonv5 -enable-pipeliner -verify-machineinstrs < %s | FileCheck %s
; If the trip count is a compile-time constant, then decrement it instead
; of computing a new LC0 value.
; CHECK-LABEL: @test
; CHECK: loop0(.LBB0_1,#999)
define i32 @test(i32* %A, i32* %B, i32 %count) {
entry:
br label %for.body
for.body:
%sum.02 = phi i32 [ 0, %entry ], [ %add, %for.body ]
%arrayidx.phi = phi i32* [ %A, %entry ], [ %arrayidx.inc, %for.body ]
%i.01 = phi i32 [ 0, %entry ], [ %inc, %for.body ]
%0 = load i32, i32* %arrayidx.phi, align 4
%add = add nsw i32 %0, %sum.02
%inc = add nsw i32 %i.01, 1
%exitcond = icmp eq i32 %inc, 1000
%arrayidx.inc = getelementptr i32, i32* %arrayidx.phi, i32 1
br i1 %exitcond, label %for.end, label %for.body
for.end:
ret i32 %add
}
; The constant trip count is small enough that the kernel is not executed.
; CHECK-LABEL: @test1
; CHECK-NOT: loop0(
define i32 @test1(i32* %A, i32* %B, i32 %count) {
entry:
br label %for.body
for.body:
%sum.02 = phi i32 [ 0, %entry ], [ %add, %for.body ]
%arrayidx.phi = phi i32* [ %A, %entry ], [ %arrayidx.inc, %for.body ]
%i.01 = phi i32 [ 0, %entry ], [ %inc, %for.body ]
%0 = load i32, i32* %arrayidx.phi, align 4
%add = add nsw i32 %0, %sum.02
%inc = add nsw i32 %i.01, 1
%exitcond = icmp eq i32 %inc, 1
%arrayidx.inc = getelementptr i32, i32* %arrayidx.phi, i32 1
br i1 %exitcond, label %for.end, label %for.body
for.end:
ret i32 %add
}
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