diff options
Diffstat (limited to 'llvm/test/Transforms')
| -rw-r--r-- | llvm/test/Transforms/GVN/non-integral-pointers.ll | 24 |
1 files changed, 19 insertions, 5 deletions
diff --git a/llvm/test/Transforms/GVN/non-integral-pointers.ll b/llvm/test/Transforms/GVN/non-integral-pointers.ll index 7c260639185..254defe0690 100644 --- a/llvm/test/Transforms/GVN/non-integral-pointers.ll +++ b/llvm/test/Transforms/GVN/non-integral-pointers.ll @@ -139,18 +139,32 @@ define <1 x i8 addrspace(4)*> @neg_forward_store_vload(<1 x i8 addrspace(4)*> ad ret <1 x i8 addrspace(4)*> %ref } -; TODO: missed optimization, we can forward the null. +; Nulls have known bit patterns, so we can forward define i8 addrspace(4)* @forward_store_zero(i8 addrspace(4)* addrspace(4)* %loc) { ; CHECK-LABEL: @forward_store_zero( ; CHECK-NEXT: entry: ; CHECK-NEXT: [[LOC_BC:%.*]] = bitcast i8 addrspace(4)* addrspace(4)* [[LOC:%.*]] to i64 addrspace(4)* -; CHECK-NEXT: store i64 5, i64 addrspace(4)* [[LOC_BC]] -; CHECK-NEXT: [[REF:%.*]] = load i8 addrspace(4)*, i8 addrspace(4)* addrspace(4)* [[LOC]] -; CHECK-NEXT: ret i8 addrspace(4)* [[REF]] +; CHECK-NEXT: store i64 0, i64 addrspace(4)* [[LOC_BC]] +; CHECK-NEXT: ret i8 addrspace(4)* null ; entry: %loc.bc = bitcast i8 addrspace(4)* addrspace(4)* %loc to i64 addrspace(4)* - store i64 5, i64 addrspace(4)* %loc.bc + store i64 0, i64 addrspace(4)* %loc.bc + %ref = load i8 addrspace(4)*, i8 addrspace(4)* addrspace(4)* %loc + ret i8 addrspace(4)* %ref +} + +; Nulls have known bit patterns, so we can forward +define i8 addrspace(4)* @forward_store_zero2(i8 addrspace(4)* addrspace(4)* %loc) { +; CHECK-LABEL: @forward_store_zero2( +; CHECK-NEXT: entry: +; CHECK-NEXT: [[LOC_BC:%.*]] = bitcast i8 addrspace(4)* addrspace(4)* [[LOC:%.*]] to <2 x i32> addrspace(4)* +; CHECK-NEXT: store <2 x i32> zeroinitializer, <2 x i32> addrspace(4)* [[LOC_BC]] +; CHECK-NEXT: ret i8 addrspace(4)* null +; + entry: + %loc.bc = bitcast i8 addrspace(4)* addrspace(4)* %loc to <2 x i32> addrspace(4)* + store <2 x i32> zeroinitializer, <2 x i32> addrspace(4)* %loc.bc %ref = load i8 addrspace(4)*, i8 addrspace(4)* addrspace(4)* %loc ret i8 addrspace(4)* %ref } |
