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[InstCombine] Add additional store forwarding test (NFC) 

Variant where the load is larger than the store. Make sure we
don't forward this.
This commit is contained in:
Nikita Popov 2021-10-21 20:47:13 +02:00
parent fdb66eda77
commit 8262f45c73
1 changed files with 14 additions and 0 deletions
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14
llvm/test/Transforms/InstCombine/load-store-forward.ll
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@ -18,6 +18,20 @@ define i8 @load_smaller_int(i16* %p) {
ret i8 %load
}
; This case can *not* be forwarded, as we only see part of the stored value.
define i32 @load_larger_int(i16* %p) {
; CHECK-LABEL: @load_larger_int(
; CHECK-NEXT: store i16 258, i16* [[P:%.*]], align 2
; CHECK-NEXT: [[P2:%.*]] = bitcast i16* [[P]] to i32*
; CHECK-NEXT: [[LOAD:%.*]] = load i32, i32* [[P2]], align 4
; CHECK-NEXT: ret i32 [[LOAD]]
;
store i16 258, i16* %p
%p2 = bitcast i16* %p to i32*
%load = load i32, i32* %p2
ret i32 %load
}
define i32 @vec_store_load_first(i32* %p) {
; CHECK-LABEL: @vec_store_load_first(
; CHECK-NEXT: [[P2:%.*]] = bitcast i32* [[P:%.*]] to <2 x i32>*