[PATCH] D56289: Added single use check to ShrinkDemandedConstant
Stanislav Mekhanoshin via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Fri Jan 4 12:28:49 PST 2019
rampitec updated this revision to Diff 180303.
rampitec retitled this revision from "[AMDGPU] Fixed cvt_f32_ubyte combine" to "Added single use check to ShrinkDemandedConstant".
rampitec edited the summary of this revision.
rampitec added a comment.
Moved single use check into ShrinkDemandedConstant.
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D56289/new/
https://reviews.llvm.org/D56289
Files:
lib/CodeGen/SelectionDAG/TargetLowering.cpp
test/CodeGen/AMDGPU/cvt_f32_ubyte.ll
Index: test/CodeGen/AMDGPU/cvt_f32_ubyte.ll
===================================================================
--- test/CodeGen/AMDGPU/cvt_f32_ubyte.ll
+++ test/CodeGen/AMDGPU/cvt_f32_ubyte.ll
@@ -281,3 +281,23 @@
store float %cvt, float addrspace(1)* %out
ret void
}
+
+; GCN-LABEL: {{^}}cvt_ubyte0_or_multiuse:
+; GCN: {{buffer|flat}}_load_dword [[LOADREG:v[0-9]+]],
+; GCN-DAG: v_or_b32_e32 [[OR:v[0-9]+]], 0x80000001, [[LOADREG]]
+; GCN-DAG: v_cvt_f32_ubyte0_e32 [[CONV:v[0-9]+]], [[OR]]
+; GCN: v_add_f32_e32 [[RES:v[0-9]+]], [[OR]], [[CONV]]
+; GCN: buffer_store_dword [[RES]],
+define amdgpu_kernel void @cvt_ubyte0_or_multiuse(i32 addrspace(1)* %in, float addrspace(1)* %out) {
+bb:
+ %lid = tail call i32 @llvm.amdgcn.workitem.id.x()
+ %gep = getelementptr inbounds i32, i32 addrspace(1)* %in, i32 %lid
+ %load = load i32, i32 addrspace(1)* %gep
+ %or = or i32 %load, -2147483647
+ %and = and i32 %or, 255
+ %uitofp = uitofp i32 %and to float
+ %cast = bitcast i32 %or to float
+ %add = fadd float %cast, %uitofp
+ store float %add, float addrspace(1)* %out
+ ret void
+}
Index: lib/CodeGen/SelectionDAG/TargetLowering.cpp
===================================================================
--- lib/CodeGen/SelectionDAG/TargetLowering.cpp
+++ lib/CodeGen/SelectionDAG/TargetLowering.cpp
@@ -350,6 +350,9 @@
SDLoc DL(Op);
unsigned Opcode = Op.getOpcode();
+ if (!Op.hasOneUse())
+ return false;
+
// Do target-specific constant optimization.
if (targetShrinkDemandedConstant(Op, Demanded, TLO))
return TLO.New.getNode();
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