[PATCH] D54728: Implement computeKnownBits for scalar_to_vector
Stanislav Mekhanoshin via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Mon Nov 19 14:44:22 PST 2018
rampitec created this revision.
rampitec added a reviewer: arsenm.
Herald added subscribers: nhaehnle, wdng, jvesely.
https://reviews.llvm.org/D54728
Files:
lib/CodeGen/SelectionDAG/SelectionDAG.cpp
test/CodeGen/AMDGPU/load-lo16.ll
Index: test/CodeGen/AMDGPU/load-lo16.ll
===================================================================
--- test/CodeGen/AMDGPU/load-lo16.ll
+++ test/CodeGen/AMDGPU/load-lo16.ll
@@ -305,8 +305,11 @@
; GFX9-NEXT: s_waitcnt
; GFX9-NEXT: s_setpc_b64
-; VI: flat_load_ubyte v{{[0-9]+}}
-; VI: v_or_b32_e32
+; VI: flat_load_ubyte [[LO:v[0-9]+]]
+; VI: v_lshrrev_b32_e32 [[HI:v[0-9]+]], 16, v2
+; VI: s_mov_b32 [[MASK:s[0-9]+]], 0x5040c00
+; VI: v_perm_b32 [[RES:v[0-9]+]], [[HI]], [[LO]], [[MASK]]
+; VI: flat_store_dword v[0:1], [[RES]]
define void @load_flat_lo_v2i16_reglo_vreg_zexti8(i8* %in, i32 %reg) #0 {
entry:
%reg.bc = bitcast i32 %reg to <2 x i16>
Index: lib/CodeGen/SelectionDAG/SelectionDAG.cpp
===================================================================
--- lib/CodeGen/SelectionDAG/SelectionDAG.cpp
+++ lib/CodeGen/SelectionDAG/SelectionDAG.cpp
@@ -2345,6 +2345,19 @@
}
break;
}
+ case ISD::SCALAR_TO_VECTOR: {
+ // We know about scalar_to_vector as much as we know about it source,
+ // which becomes the first element of otherwise unknown vector.
+ if (DemandedElts != 1)
+ break;
+
+ SDValue N0 = Op.getOperand(0);
+ Known = computeKnownBits(N0, DemandedElts, Depth + 1);
+ if (N0.getValueSizeInBits() != BitWidth)
+ Known = Known.trunc(BitWidth);
+
+ break;
+ }
case ISD::BITCAST: {
SDValue N0 = Op.getOperand(0);
EVT SubVT = N0.getValueType();
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