forked from OSchip/llvm-project
162 lines
4.4 KiB
LLVM
162 lines
4.4 KiB
LLVM
; RUN: llc -march=hexagon < %s | FileCheck %s
|
|
; Check that we generate hardware loop instructions.
|
|
|
|
; Case 1 : Loop with a constant number of iterations.
|
|
; CHECK-LABEL: @hwloop1
|
|
; CHECK: loop0(.LBB{{.}}_{{.}}, #10)
|
|
; CHECK: endloop0
|
|
|
|
@a = common global [10 x i32] zeroinitializer, align 4
|
|
define i32 @hwloop1() nounwind {
|
|
entry:
|
|
br label %for.body
|
|
for.body:
|
|
%i.01 = phi i32 [ 0, %entry ], [ %inc, %for.body ]
|
|
%arrayidx = getelementptr inbounds [10 x i32], [10 x i32]* @a, i32 0, i32 %i.01
|
|
store i32 %i.01, i32* %arrayidx, align 4
|
|
%inc = add nsw i32 %i.01, 1
|
|
%exitcond = icmp eq i32 %inc, 10
|
|
br i1 %exitcond, label %for.end, label %for.body
|
|
for.end:
|
|
ret i32 0
|
|
}
|
|
|
|
; Case 2 : Loop with a run-time number of iterations.
|
|
; CHECK-LABEL: @hwloop2
|
|
; CHECK: loop0(.LBB{{.}}_{{.}}, r{{[0-9]+}})
|
|
; CHECK: endloop0
|
|
|
|
define i32 @hwloop2(i32 %n, i32* nocapture %b) nounwind {
|
|
entry:
|
|
%cmp1 = icmp sgt i32 %n, 0
|
|
br i1 %cmp1, label %for.body.preheader, label %for.end
|
|
|
|
for.body.preheader:
|
|
br label %for.body
|
|
|
|
for.body:
|
|
%a.03 = phi i32 [ %add, %for.body ], [ 0, %for.body.preheader ]
|
|
%i.02 = phi i32 [ %inc, %for.body ], [ 0, %for.body.preheader ]
|
|
%arrayidx = getelementptr inbounds i32, i32* %b, i32 %i.02
|
|
%0 = load i32, i32* %arrayidx, align 4
|
|
%add = add nsw i32 %0, %a.03
|
|
%inc = add nsw i32 %i.02, 1
|
|
%exitcond = icmp eq i32 %inc, %n
|
|
br i1 %exitcond, label %for.end.loopexit, label %for.body
|
|
|
|
for.end.loopexit:
|
|
br label %for.end
|
|
|
|
for.end:
|
|
%a.0.lcssa = phi i32 [ 0, %entry ], [ %add, %for.end.loopexit ]
|
|
ret i32 %a.0.lcssa
|
|
}
|
|
|
|
; Case 3 : Induction variable increment more than 1.
|
|
; CHECK-LABEL: @hwloop3
|
|
; CHECK: lsr(r{{[0-9]+}}, #2)
|
|
; CHECK: loop0(.LBB{{.}}_{{.}}, r{{[0-9]+}})
|
|
; CHECK: endloop0
|
|
|
|
define i32 @hwloop3(i32 %n, i32* nocapture %b) nounwind {
|
|
entry:
|
|
%cmp1 = icmp sgt i32 %n, 0
|
|
br i1 %cmp1, label %for.body.preheader, label %for.end
|
|
|
|
for.body.preheader:
|
|
br label %for.body
|
|
|
|
for.body:
|
|
%a.03 = phi i32 [ %add, %for.body ], [ 0, %for.body.preheader ]
|
|
%i.02 = phi i32 [ %inc, %for.body ], [ 0, %for.body.preheader ]
|
|
%arrayidx = getelementptr inbounds i32, i32* %b, i32 %i.02
|
|
%0 = load i32, i32* %arrayidx, align 4
|
|
%add = add nsw i32 %0, %a.03
|
|
%inc = add nsw i32 %i.02, 4
|
|
%exitcond = icmp eq i32 %inc, %n
|
|
br i1 %exitcond, label %for.end.loopexit, label %for.body
|
|
|
|
for.end.loopexit:
|
|
br label %for.end
|
|
|
|
for.end:
|
|
%a.0.lcssa = phi i32 [ 0, %entry ], [ %add, %for.end.loopexit ]
|
|
ret i32 %a.0.lcssa
|
|
}
|
|
|
|
; Case 4 : Loop exit compare uses register instead of immediate value.
|
|
; CHECK-LABEL: @hwloop4
|
|
; CHECK: loop0(.LBB{{.}}_{{.}}, r{{[0-9]+}})
|
|
; CHECK: endloop0
|
|
|
|
define i32 @hwloop4(i32 %n, i32* nocapture %b) nounwind {
|
|
entry:
|
|
%cmp1 = icmp sgt i32 %n, 0
|
|
br i1 %cmp1, label %for.body.preheader, label %for.end
|
|
|
|
for.body.preheader:
|
|
br label %for.body
|
|
|
|
for.body:
|
|
%i.02 = phi i32 [ %inc, %for.body ], [ 0, %for.body.preheader ]
|
|
%arrayidx = getelementptr inbounds i32, i32* %b, i32 %i.02
|
|
store i32 %i.02, i32* %arrayidx, align 4
|
|
%inc = add nsw i32 %i.02, 1
|
|
%exitcond = icmp eq i32 %inc, %n
|
|
br i1 %exitcond, label %for.end.loopexit, label %for.body
|
|
|
|
for.end.loopexit:
|
|
br label %for.end
|
|
|
|
for.end:
|
|
ret i32 0
|
|
}
|
|
|
|
; Case 5: After LSR, the initial value is 100 and the iv decrements to 0.
|
|
; CHECK-LABEL: @hwloop5
|
|
; CHECK: loop0(.LBB{{.}}_{{.}}, #100)
|
|
; CHECK: endloop0
|
|
|
|
define void @hwloop5(i32* nocapture %a, i32* nocapture %res) nounwind {
|
|
entry:
|
|
br label %for.body
|
|
|
|
for.body:
|
|
%i.03 = phi i32 [ 0, %entry ], [ %inc, %for.body ]
|
|
%arrayidx = getelementptr inbounds i32, i32* %a, i32 %i.03
|
|
%0 = load i32, i32* %arrayidx, align 4
|
|
%mul = mul nsw i32 %0, %0
|
|
%arrayidx2 = getelementptr inbounds i32, i32* %res, i32 %i.03
|
|
store i32 %mul, i32* %arrayidx2, align 4
|
|
%inc = add nsw i32 %i.03, 1
|
|
%exitcond = icmp eq i32 %inc, 100
|
|
br i1 %exitcond, label %for.end, label %for.body
|
|
|
|
for.end:
|
|
ret void
|
|
}
|
|
|
|
; Case 6: Large immediate offset
|
|
; CHECK-LABEL: @hwloop6
|
|
; CHECK-NOT: loop0(.LBB{{.}}_{{.}}, #1024)
|
|
; CHECK: loop0(.LBB{{.}}_{{.}}, r{{[0-9]+}})
|
|
; CHECK: endloop0
|
|
|
|
define void @hwloop6(i32* nocapture %a, i32* nocapture %res) nounwind {
|
|
entry:
|
|
br label %for.body
|
|
|
|
for.body:
|
|
%i.02 = phi i32 [ 0, %entry ], [ %inc, %for.body ]
|
|
%arrayidx = getelementptr inbounds i32, i32* %a, i32 %i.02
|
|
%0 = load i32, i32* %arrayidx, align 4
|
|
%arrayidx1 = getelementptr inbounds i32, i32* %res, i32 %i.02
|
|
store i32 %0, i32* %arrayidx1, align 4
|
|
%inc = add nsw i32 %i.02, 1
|
|
%exitcond = icmp eq i32 %inc, 1024
|
|
br i1 %exitcond, label %for.end, label %for.body
|
|
|
|
for.end:
|
|
ret void
|
|
}
|