[AMDGPU] Use packed literals with zero either lower or hi part

Differential Revision: https://reviews.llvm.org/D45790

llvm-svn: 330365

6 files changed, 119 insertions, 7 deletions

diff --git a/llvm/lib/Target/AMDGPU/SIFoldOperands.cpp b/llvm/lib/Target/AMDGPU/SIFoldOperands.cpp
index be98720765e..4834d158d85 100644
--- a/llvm/lib/Target/AMDGPU/SIFoldOperands.cpp
+++ b/llvm/lib/Target/AMDGPU/SIFoldOperands.cpp
@@ -156,7 +156,8 @@ static bool updateOperand(FoldCandidate &Fold,
 
   if (Fold.isImm()) {
     if (MI->getDesc().TSFlags & SIInstrFlags::IsPacked) {
-      // Set op_sel_hi on this operand or bail out if op_sel is already set.
+      // Set op_sel/op_sel_hi on this operand or bail out if op_sel is
+      // already set.
       unsigned Opcode = MI->getOpcode();
       int OpNo = MI->getOperandNo(&Old);
       int ModIdx = -1;
@@ -172,7 +173,16 @@ static bool updateOperand(FoldCandidate &Fold,
       unsigned Val = Mod.getImm();
       if ((Val & SISrcMods::OP_SEL_0) || !(Val & SISrcMods::OP_SEL_1))
         return false;
-      Mod.setImm(Mod.getImm() & ~SISrcMods::OP_SEL_1);
+      // If upper part is all zero we do not need op_sel_hi.
+      if (!isUInt<16>(Fold.ImmToFold)) {
+        if (!(Fold.ImmToFold & 0xffff)) {
+          Mod.setImm(Mod.getImm() | SISrcMods::OP_SEL_0);
+          Mod.setImm(Mod.getImm() & ~SISrcMods::OP_SEL_1);
+          Old.ChangeToImmediate(Fold.ImmToFold >> 16);
+          return true;
+        }
+        Mod.setImm(Mod.getImm() & ~SISrcMods::OP_SEL_1);
+      }
     }
     Old.ChangeToImmediate(Fold.ImmToFold);
     return true;
diff --git a/llvm/lib/Target/AMDGPU/SIInstrInfo.cpp b/llvm/lib/Target/AMDGPU/SIInstrInfo.cpp
index e7e1bdbd0b1..6feca38ba68 100644
--- a/llvm/lib/Target/AMDGPU/SIInstrInfo.cpp
+++ b/llvm/lib/Target/AMDGPU/SIInstrInfo.cpp
@@ -2339,6 +2339,15 @@ bool SIInstrInfo::isInlineConstant(const MachineOperand &MO,
   }
   case AMDGPU::OPERAND_REG_INLINE_C_V2INT16:
   case AMDGPU::OPERAND_REG_INLINE_C_V2FP16: {
+    if (isUInt<16>(Imm)) {
+      int16_t Trunc = static_cast<int16_t>(Imm);
+      return ST.has16BitInsts() &&
+             AMDGPU::isInlinableLiteral16(Trunc, ST.hasInv2PiInlineImm());
+    }
+    if (!(Imm & 0xffff)) {
+      return ST.has16BitInsts() &&
+             AMDGPU::isInlinableLiteral16(Imm >> 16, ST.hasInv2PiInlineImm());
+    }
     uint32_t Trunc = static_cast<uint32_t>(Imm);
     return  AMDGPU::isInlinableLiteralV216(Trunc, ST.hasInv2PiInlineImm());
   }
diff --git a/llvm/test/CodeGen/AMDGPU/add.v2i16.ll b/llvm/test/CodeGen/AMDGPU/add.v2i16.ll
index aa5026aba36..c0bf7ba70a1 100644
--- a/llvm/test/CodeGen/AMDGPU/add.v2i16.ll
+++ b/llvm/test/CodeGen/AMDGPU/add.v2i16.ll
@@ -115,8 +115,7 @@ define amdgpu_kernel void @v_test_add_v2i16_inline_neg1(<2 x i16> addrspace(1)*
 }
 
 ; GCN-LABEL: {{^}}v_test_add_v2i16_inline_lo_zero_hi:
-; GFX9: s_mov_b32 [[K:s[0-9]+]], 32{{$}}
-; GFX9: v_pk_add_u16 v{{[0-9]+}}, v{{[0-9]+}}, [[K]]{{$}}
+; GFX9: v_pk_add_u16 v{{[0-9]+}}, v{{[0-9]+}}, 32{{$}}
 
 ; VI-NOT: v_add_u16
 ; VI: v_add_u16_e32 v{{[0-9]+}}, 32, v{{[0-9]+}}
diff --git a/llvm/test/CodeGen/AMDGPU/immv216.ll b/llvm/test/CodeGen/AMDGPU/immv216.ll
index 714aa66d277..4844060feba 100644
--- a/llvm/test/CodeGen/AMDGPU/immv216.ll
+++ b/llvm/test/CodeGen/AMDGPU/immv216.ll
@@ -117,7 +117,7 @@ define amdgpu_kernel void @store_literal_imm_v2f16(<2 x half> addrspace(1)* %out
 
 ; GCN-LABEL: {{^}}add_inline_imm_0.0_v2f16:
 ; GFX9: s_load_dword [[VAL:s[0-9]+]]
-; GFX9: v_pk_add_f16 [[REG:v[0-9]+]], [[VAL]], 0 op_sel_hi:[1,0]{{$}}
+; GFX9: v_pk_add_f16 [[REG:v[0-9]+]], [[VAL]], 0{{$}}
 ; GFX9: buffer_store_dword [[REG]]
 
 ; VI: buffer_load_ushort [[VAL0:v[0-9]+]]
diff --git a/llvm/test/CodeGen/AMDGPU/pk_max_f16_literal.ll b/llvm/test/CodeGen/AMDGPU/pk_max_f16_literal.ll
new file mode 100644
index 00000000000..f19afa5df30
--- /dev/null
+++ b/llvm/test/CodeGen/AMDGPU/pk_max_f16_literal.ll
@@ -0,0 +1,95 @@
+; RUN: llc -march=amdgcn -mcpu=gfx900 -verify-machineinstrs < %s | FileCheck -check-prefixes=GCN,GFX9 %s
+
+; GCN-LABEL: {{^}}test_pk_max_f16_literal_0_1:
+; GFX9: v_pk_max_f16 v{{[0-9]+}}, v{{[0-9]+}}, 1.0 op_sel:[0,1] op_sel_hi:[1,0]{{$}}
+define amdgpu_kernel void @test_pk_max_f16_literal_0_1(<2 x half> addrspace(1)* nocapture %arg) {
+bb:
+  %tmp = tail call i32 @llvm.amdgcn.workitem.id.x()
+  %tmp1 = zext i32 %tmp to i64
+  %tmp2 = getelementptr inbounds <2 x half>, <2 x half> addrspace(1)* %arg, i64 %tmp1
+  %tmp3 = load <2 x half>, <2 x half> addrspace(1)* %tmp2, align 4
+  %tmp4 = tail call <2 x half> @llvm.maxnum.v2f16(<2 x half> %tmp3, <2 x half> <half 0xH0000, half 0xH3C00>)
+  store <2 x half> %tmp4, <2 x half> addrspace(1)* %tmp2, align 4
+  ret void
+}
+
+; GCN-LABEL: {{^}}test_pk_max_f16_literal_1_0:
+; GFX9: v_pk_max_f16 v{{[0-9]+}}, v{{[0-9]+}}, 1.0{{$}}
+define amdgpu_kernel void @test_pk_max_f16_literal_1_0(<2 x half> addrspace(1)* nocapture %arg) {
+bb:
+  %tmp = tail call i32 @llvm.amdgcn.workitem.id.x()
+  %tmp1 = zext i32 %tmp to i64
+  %tmp2 = getelementptr inbounds <2 x half>, <2 x half> addrspace(1)* %arg, i64 %tmp1
+  %tmp3 = load <2 x half>, <2 x half> addrspace(1)* %tmp2, align 4
+  %tmp4 = tail call <2 x half> @llvm.maxnum.v2f16(<2 x half> %tmp3, <2 x half> <half 0xH3C00, half 0xH0000>) 
+  store <2 x half> %tmp4, <2 x half> addrspace(1)* %tmp2, align 4
+  ret void
+}
+
+; GCN-LABEL: {{^}}test_pk_max_f16_literal_1_1:
+; GFX9: v_pk_max_f16 v{{[0-9]+}}, v{{[0-9]+}}, 1.0 op_sel_hi:[1,0]{{$}}
+define amdgpu_kernel void @test_pk_max_f16_literal_1_1(<2 x half> addrspace(1)* nocapture %arg) {
+bb:
+  %tmp = tail call i32 @llvm.amdgcn.workitem.id.x()
+  %tmp1 = zext i32 %tmp to i64
+  %tmp2 = getelementptr inbounds <2 x half>, <2 x half> addrspace(1)* %arg, i64 %tmp1
+  %tmp3 = load <2 x half>, <2 x half> addrspace(1)* %tmp2, align 4
+  %tmp4 = tail call <2 x half> @llvm.maxnum.v2f16(<2 x half> %tmp3, <2 x half> <half 0xH3C00, half 0xH3C00>)
+  store <2 x half> %tmp4, <2 x half> addrspace(1)* %tmp2, align 4
+  ret void
+}
+
+; GCN-LABEL: {{^}}test_pk_max_f16_literal_0_m1:
+; GFX9: v_pk_max_f16 v{{[0-9]+}}, -1.0, v{{[0-9]+}} op_sel:[1,0] op_sel_hi:[0,1]{{$}}
+define amdgpu_kernel void @test_pk_max_f16_literal_0_m1(<2 x half> addrspace(1)* nocapture %arg) {
+bb:
+  %tmp = tail call i32 @llvm.amdgcn.workitem.id.x()
+  %tmp1 = zext i32 %tmp to i64
+  %tmp2 = getelementptr inbounds <2 x half>, <2 x half> addrspace(1)* %arg, i64 %tmp1
+  %tmp3 = load <2 x half>, <2 x half> addrspace(1)* %tmp2, align 4
+  %tmp4 = tail call <2 x half> @llvm.maxnum.v2f16(<2 x half> %tmp3, <2 x half> <half 0xH0000, half 0xHBC00>)
+  store <2 x half> %tmp4, <2 x half> addrspace(1)* %tmp2, align 4
+  ret void
+}
+
+; GCN-LABEL: {{^}}test_pk_max_f16_literal_m1_0:
+; GFX9: v_pk_max_f16 v{{[0-9]+}}, v{{[0-9]+}}, -1.0{{$}}
+define amdgpu_kernel void @test_pk_max_f16_literal_m1_0(<2 x half> addrspace(1)* nocapture %arg) {
+bb:
+  %tmp = tail call i32 @llvm.amdgcn.workitem.id.x()
+  %tmp1 = zext i32 %tmp to i64
+  %tmp2 = getelementptr inbounds <2 x half>, <2 x half> addrspace(1)* %arg, i64 %tmp1
+  %tmp3 = load <2 x half>, <2 x half> addrspace(1)* %tmp2, align 4
+  %tmp4 = tail call <2 x half> @llvm.maxnum.v2f16(<2 x half> %tmp3, <2 x half> <half 0xHBC00, half 0xH0000>)
+  store <2 x half> %tmp4, <2 x half> addrspace(1)* %tmp2, align 4
+  ret void
+}
+
+; GCN-LABEL: {{^}}test_pk_max_f16_literal_m1_m1:
+; GFX9: v_pk_max_f16 v{{[0-9]+}}, v{{[0-9]+}}, -1.0 op_sel_hi:[1,0]{{$}}
+define amdgpu_kernel void @test_pk_max_f16_literal_m1_m1(<2 x half> addrspace(1)* nocapture %arg) {
+bb:
+  %tmp = tail call i32 @llvm.amdgcn.workitem.id.x()
+  %tmp1 = zext i32 %tmp to i64
+  %tmp2 = getelementptr inbounds <2 x half>, <2 x half> addrspace(1)* %arg, i64 %tmp1
+  %tmp3 = load <2 x half>, <2 x half> addrspace(1)* %tmp2, align 4
+  %tmp4 = tail call <2 x half> @llvm.maxnum.v2f16(<2 x half> %tmp3, <2 x half> <half 0xHBC00, half 0xHBC00>)
+  store <2 x half> %tmp4, <2 x half> addrspace(1)* %tmp2, align 4
+  ret void
+}
+
+; GCN-LABEL: {{^}}test_pk_max_f16_literal_0_0:
+; GFX9: v_pk_max_f16 v{{[0-9]+}}, v{{[0-9]+}}, 0{{$}}
+define amdgpu_kernel void @test_pk_max_f16_literal_0_0(<2 x half> addrspace(1)* nocapture %arg) {
+bb:
+  %tmp = tail call i32 @llvm.amdgcn.workitem.id.x()
+  %tmp1 = zext i32 %tmp to i64
+  %tmp2 = getelementptr inbounds <2 x half>, <2 x half> addrspace(1)* %arg, i64 %tmp1
+  %tmp3 = load <2 x half>, <2 x half> addrspace(1)* %tmp2, align 4
+  %tmp4 = tail call <2 x half> @llvm.maxnum.v2f16(<2 x half> %tmp3, <2 x half> <half 0xH0000, half 0xH0000>)
+  store <2 x half> %tmp4, <2 x half> addrspace(1)* %tmp2, align 4
+  ret void
+}
+
+declare <2 x half> @llvm.maxnum.v2f16(<2 x half>, <2 x half>)
+declare i32 @llvm.amdgcn.workitem.id.x()
diff --git a/llvm/test/CodeGen/AMDGPU/sub.v2i16.ll b/llvm/test/CodeGen/AMDGPU/sub.v2i16.ll
index 4f149308e62..a608ef715c5 100644
--- a/llvm/test/CodeGen/AMDGPU/sub.v2i16.ll
+++ b/llvm/test/CodeGen/AMDGPU/sub.v2i16.ll
@@ -112,8 +112,7 @@ define amdgpu_kernel void @v_test_sub_v2i16_inline_neg1(<2 x i16> addrspace(1)*
 }
 
 ; GCN-LABEL: {{^}}v_test_sub_v2i16_inline_lo_zero_hi:
-; GFX9: s_mov_b32 [[K:s[0-9]+]], 32{{$}}
-; GFX9: v_pk_sub_i16 v{{[0-9]+}}, v{{[0-9]+}}, [[K]]
+; GFX9: v_pk_sub_i16 v{{[0-9]+}}, v{{[0-9]+}}, 32{{$}}
 
 ; VI-NOT: v_subrev_i16
 ; VI: v_add_u16_e32 v{{[0-9]+}}, 0xffffffe0, v{{[0-9]+}}