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DAGCombiner: Make sure an integer is being truncated 

llvm-svn: 262446
This commit is contained in:
Matt Arsenault 2016-03-02 01:36:51 +00:00
parent 0c8fad7dba
commit 7d0a77b979
2 changed files with 29 additions and 2 deletions
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2
llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -12198,7 +12198,7 @@ SDValue DAGCombiner::visitEXTRACT_VECTOR_ELT(SDNode *N) {
// extract_vector_elt (v2i32 (bitcast i64:x)), 0 -> i32 (trunc i64:x)
if (ConstEltNo && InVec.getOpcode() == ISD::BITCAST && InVec.hasOneUse() &&
ConstEltNo->isNullValue()) {
ConstEltNo->isNullValue() && VT.isInteger()) {
SDValue BCSrc = InVec.getOperand(0);
if (BCSrc.getValueType().isScalarInteger())
return DAG.getNode(ISD::TRUNCATE, SDLoc(N), NVT, BCSrc);

29
llvm/test/CodeGen/AMDGPU/extractelt-to-trunc.ll
View File

@ -13,5 +13,32 @@ define void @bitcast_int_to_vector_extract_0(i32 addrspace(1)* %out, i64 addrspa
%val.bc = bitcast i64 %add to <2 x i32>
%extract = extractelement <2 x i32> %val.bc, i32 0
store i32 %extract, i32 addrspace(1)* %out
ret void
ret void
}
; GCN-LABEL: {{^}}bitcast_fp_to_vector_extract_0:
; GCN: buffer_load_dwordx2
; GCN: v_add_f64
; GCN: buffer_store_dword v
define void @bitcast_fp_to_vector_extract_0(i32 addrspace(1)* %out, double addrspace(1)* %in, double %b) {
%a = load double, double addrspace(1)* %in
%add = fadd double %a, %b
%val.bc = bitcast double %add to <2 x i32>
%extract = extractelement <2 x i32> %val.bc, i32 0
store i32 %extract, i32 addrspace(1)* %out
ret void
}
; GCN-LABEL: {{^}}bitcast_int_to_fpvector_extract_0:
; GCN: buffer_load_dwordx2
; GCN: v_add_i32
; GCN: v_addc_u32
; GCN: buffer_store_dword
define void @bitcast_int_to_fpvector_extract_0(float addrspace(1)* %out, i64 addrspace(1)* %in, i64 %b) {
%a = load i64, i64 addrspace(1)* %in
%add = add i64 %a, %b
%val.bc = bitcast i64 %add to <2 x float>
%extract = extractelement <2 x float> %val.bc, i32 0
store float %extract, float addrspace(1)* %out
ret void
}