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[AArch64] Add regression tests for the load/store optimizer which cover post-index update folding with sub rather than add.

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The tests check that the following transform happens:

  (ldr|str) X, [x20]
   ...
  sub x20, x20, #16
   ->
  (ldr|str) X, [x20], #-16

with X being either w0, x0, s0, d0 or q0.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@210113 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Tilmann Scheller 2014-06-03 16:03:00 +00:00
parent 45178b9d60
commit 9f039304b3
1 changed files with 130 additions and 0 deletions
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130
test/CodeGen/AArch64/ldst-opt.ll
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@ -635,3 +635,133 @@ declare void @use-doubleword(i64)
declare void @use-quadword(<2 x i64>)
declare void @use-float(float)
declare void @use-double(double)
; Check the following transform:
;
; (ldr|str) X, [x20]
; ...
; sub x20, x20, #16
; ->
; (ldr|str) X, [x20], #-16
;
; with X being either w0, x0, s0, d0 or q0.
define void @post-indexed-sub-word(i32* %a, i32* %b, i64 %count) nounwind {
; CHECK-LABEL: post-indexed-sub-word
; CHECK: ldr w{{[0-9]+}}, [x{{[0-9]+}}], #-8
; CHECK: str w{{[0-9]+}}, [x{{[0-9]+}}], #-8
br label %for.body
for.body:
%phi1 = phi i32* [ %gep4, %for.body ], [ %b, %0 ]
%phi2 = phi i32* [ %gep3, %for.body ], [ %a, %0 ]
%i = phi i64 [ %dec.i, %for.body], [ %count, %0 ]
%gep1 = getelementptr i32* %phi1, i64 -1
%load1 = load i32* %gep1
%gep2 = getelementptr i32* %phi2, i64 -1
store i32 %load1, i32* %gep2
%load2 = load i32* %phi1
store i32 %load2, i32* %phi2
%dec.i = add nsw i64 %i, -1
%gep3 = getelementptr i32* %phi2, i64 -2
%gep4 = getelementptr i32* %phi1, i64 -2
%cond = icmp sgt i64 %dec.i, 0
br i1 %cond, label %for.body, label %end
end:
ret void
}
define void @post-indexed-sub-doubleword(i64* %a, i64* %b, i64 %count) nounwind {
; CHECK-LABEL: post-indexed-sub-doubleword
; CHECK: ldr x{{[0-9]+}}, [x{{[0-9]+}}], #-16
; CHECK: str x{{[0-9]+}}, [x{{[0-9]+}}], #-16
br label %for.body
for.body:
%phi1 = phi i64* [ %gep4, %for.body ], [ %b, %0 ]
%phi2 = phi i64* [ %gep3, %for.body ], [ %a, %0 ]
%i = phi i64 [ %dec.i, %for.body], [ %count, %0 ]
%gep1 = getelementptr i64* %phi1, i64 -1
%load1 = load i64* %gep1
%gep2 = getelementptr i64* %phi2, i64 -1
store i64 %load1, i64* %gep2
%load2 = load i64* %phi1
store i64 %load2, i64* %phi2
%dec.i = add nsw i64 %i, -1
%gep3 = getelementptr i64* %phi2, i64 -2
%gep4 = getelementptr i64* %phi1, i64 -2
%cond = icmp sgt i64 %dec.i, 0
br i1 %cond, label %for.body, label %end
end:
ret void
}
define void @post-indexed-sub-quadword(<2 x i64>* %a, <2 x i64>* %b, i64 %count) nounwind {
; CHECK-LABEL: post-indexed-sub-quadword
; CHECK: ldr q{{[0-9]+}}, [x{{[0-9]+}}], #-32
; CHECK: str q{{[0-9]+}}, [x{{[0-9]+}}], #-32
br label %for.body
for.body:
%phi1 = phi <2 x i64>* [ %gep4, %for.body ], [ %b, %0 ]
%phi2 = phi <2 x i64>* [ %gep3, %for.body ], [ %a, %0 ]
%i = phi i64 [ %dec.i, %for.body], [ %count, %0 ]
%gep1 = getelementptr <2 x i64>* %phi1, i64 -1
%load1 = load <2 x i64>* %gep1
%gep2 = getelementptr <2 x i64>* %phi2, i64 -1
store <2 x i64> %load1, <2 x i64>* %gep2
%load2 = load <2 x i64>* %phi1
store <2 x i64> %load2, <2 x i64>* %phi2
%dec.i = add nsw i64 %i, -1
%gep3 = getelementptr <2 x i64>* %phi2, i64 -2
%gep4 = getelementptr <2 x i64>* %phi1, i64 -2
%cond = icmp sgt i64 %dec.i, 0
br i1 %cond, label %for.body, label %end
end:
ret void
}
define void @post-indexed-sub-float(float* %a, float* %b, i64 %count) nounwind {
; CHECK-LABEL: post-indexed-sub-float
; CHECK: ldr s{{[0-9]+}}, [x{{[0-9]+}}], #-8
; CHECK: str s{{[0-9]+}}, [x{{[0-9]+}}], #-8
br label %for.body
for.body:
%phi1 = phi float* [ %gep4, %for.body ], [ %b, %0 ]
%phi2 = phi float* [ %gep3, %for.body ], [ %a, %0 ]
%i = phi i64 [ %dec.i, %for.body], [ %count, %0 ]
%gep1 = getelementptr float* %phi1, i64 -1
%load1 = load float* %gep1
%gep2 = getelementptr float* %phi2, i64 -1
store float %load1, float* %gep2
%load2 = load float* %phi1
store float %load2, float* %phi2
%dec.i = add nsw i64 %i, -1
%gep3 = getelementptr float* %phi2, i64 -2
%gep4 = getelementptr float* %phi1, i64 -2
%cond = icmp sgt i64 %dec.i, 0
br i1 %cond, label %for.body, label %end
end:
ret void
}
define void @post-indexed-sub-double(double* %a, double* %b, i64 %count) nounwind {
; CHECK-LABEL: post-indexed-sub-double
; CHECK: ldr d{{[0-9]+}}, [x{{[0-9]+}}], #-16
; CHECK: str d{{[0-9]+}}, [x{{[0-9]+}}], #-16
br label %for.body
for.body:
%phi1 = phi double* [ %gep4, %for.body ], [ %b, %0 ]
%phi2 = phi double* [ %gep3, %for.body ], [ %a, %0 ]
%i = phi i64 [ %dec.i, %for.body], [ %count, %0 ]
%gep1 = getelementptr double* %phi1, i64 -1
%load1 = load double* %gep1
%gep2 = getelementptr double* %phi2, i64 -1
store double %load1, double* %gep2
%load2 = load double* %phi1
store double %load2, double* %phi2
%dec.i = add nsw i64 %i, -1
%gep3 = getelementptr double* %phi2, i64 -2
%gep4 = getelementptr double* %phi1, i64 -2
%cond = icmp sgt i64 %dec.i, 0
br i1 %cond, label %for.body, label %end
end:
ret void
}