[llvm-branch-commits] [llvm] 19b5300 - [SystemZ] Precommit for moving some functions around. (#177441)

[Cullen Rhodes via llvm-branch-commits]

Author: Jonas Paulsson
Date: 2026-01-29T08:15:25Z
New Revision: 19b530052723e0c95a662e5bdb554cb607db3a39

URL: https://github.com/llvm/llvm-project/commit/19b530052723e0c95a662e5bdb554cb607db3a39
DIFF: https://github.com/llvm/llvm-project/commit/19b530052723e0c95a662e5bdb554cb607db3a39.diff

LOG: [SystemZ] Precommit for moving some functions around. (#177441)

In preparation for #171066 (FP16 vector support).

(cherry picked from commit e0a132691fe9499857d95dc1d26994f82f7f4a44)

Added: 
    

Modified: 
    llvm/lib/Target/SystemZ/SystemZISelLowering.cpp
    llvm/lib/Target/SystemZ/SystemZISelLowering.h

Removed: 
    


################################################################################
diff  --git a/llvm/lib/Target/SystemZ/SystemZISelLowering.cpp b/llvm/lib/Target/SystemZ/SystemZISelLowering.cpp
index e979c63d03dbc..87b074194c74f 100644
--- a/llvm/lib/Target/SystemZ/SystemZISelLowering.cpp
+++ b/llvm/lib/Target/SystemZ/SystemZISelLowering.cpp
@@ -842,6 +842,17 @@ bool SystemZTargetLowering::useSoftFloat() const {
   return Subtarget.hasSoftFloat();
 }
 
+MVT SystemZTargetLowering::getRegisterTypeForCallingConv(LLVMContext &Context,
+                                                         CallingConv::ID CC,
+                                                         EVT VT) const {
+  // 128-bit single-element vector types are passed like other vectors,
+  // not like their element type.
+  if (VT.isVector() && VT.getSizeInBits() == 128 &&
+      VT.getVectorNumElements() == 1)
+    return MVT::v16i8;
+  return TargetLowering::getRegisterTypeForCallingConv(Context, CC, VT);
+}
+
 EVT SystemZTargetLowering::getSetCCResultType(const DataLayout &DL,
                                               LLVMContext &, EVT VT) const {
   if (!VT.isVector())
@@ -6561,6 +6572,33 @@ SDValue SystemZTargetLowering::lowerSCALAR_TO_VECTOR(SDValue Op,
                      Op.getOperand(0), DAG.getConstant(0, DL, MVT::i32));
 }
 
+// Shift the lower 2 bytes of Op to the left in order to insert into the
+// upper 2 bytes of the FP register.
+static SDValue convertToF16(SDValue Op, SelectionDAG &DAG) {
+  assert(Op.getSimpleValueType() == MVT::i64 &&
+         "Expexted to convert i64 to f16.");
+  SDLoc DL(Op);
+  SDValue Shft = DAG.getNode(ISD::SHL, DL, MVT::i64, Op,
+                             DAG.getConstant(48, DL, MVT::i64));
+  SDValue BCast = DAG.getNode(ISD::BITCAST, DL, MVT::f64, Shft);
+  SDValue F16Val =
+      DAG.getTargetExtractSubreg(SystemZ::subreg_h16, DL, MVT::f16, BCast);
+  return F16Val;
+}
+
+// Extract Op into GPR and shift the 2 f16 bytes to the right.
+static SDValue convertFromF16(SDValue Op, SDLoc DL, SelectionDAG &DAG) {
+  assert(Op.getSimpleValueType() == MVT::f16 &&
+         "Expected to convert f16 to i64.");
+  SDNode *U32 = DAG.getMachineNode(TargetOpcode::IMPLICIT_DEF, DL, MVT::f64);
+  SDValue In64 = DAG.getTargetInsertSubreg(SystemZ::subreg_h16, DL, MVT::f64,
+                                           SDValue(U32, 0), Op);
+  SDValue BCast = DAG.getNode(ISD::BITCAST, DL, MVT::i64, In64);
+  SDValue Shft = DAG.getNode(ISD::SRL, DL, MVT::i64, BCast,
+                             DAG.getConstant(48, DL, MVT::i32));
+  return Shft;
+}
+
 SDValue SystemZTargetLowering::lowerINSERT_VECTOR_ELT(SDValue Op,
                                                       SelectionDAG &DAG) const {
   // Handle insertions of floating-point values.
@@ -6951,33 +6989,6 @@ SDValue SystemZTargetLowering::lower_INT_TO_FP(SDValue Op,
   return Op; // Legal
 }
 
-// Shift the lower 2 bytes of Op to the left in order to insert into the
-// upper 2 bytes of the FP register.
-static SDValue convertToF16(SDValue Op, SelectionDAG &DAG) {
-  assert(Op.getSimpleValueType() == MVT::i64 &&
-         "Expexted to convert i64 to f16.");
-  SDLoc DL(Op);
-  SDValue Shft = DAG.getNode(ISD::SHL, DL, MVT::i64, Op,
-                             DAG.getConstant(48, DL, MVT::i64));
-  SDValue BCast = DAG.getNode(ISD::BITCAST, DL, MVT::f64, Shft);
-  SDValue F16Val =
-      DAG.getTargetExtractSubreg(SystemZ::subreg_h16, DL, MVT::f16, BCast);
-  return F16Val;
-}
-
-// Extract Op into GPR and shift the 2 f16 bytes to the right.
-static SDValue convertFromF16(SDValue Op, SDLoc DL, SelectionDAG &DAG) {
-  assert(Op.getSimpleValueType() == MVT::f16 &&
-         "Expected to convert f16 to i64.");
-  SDNode *U32 = DAG.getMachineNode(TargetOpcode::IMPLICIT_DEF, DL, MVT::f64);
-  SDValue In64 = DAG.getTargetInsertSubreg(SystemZ::subreg_h16, DL, MVT::f64,
-                                           SDValue(U32, 0), Op);
-  SDValue BCast = DAG.getNode(ISD::BITCAST, DL, MVT::i64, In64);
-  SDValue Shft = DAG.getNode(ISD::SRL, DL, MVT::i64, BCast,
-                             DAG.getConstant(48, DL, MVT::i32));
-  return Shft;
-}
-
 // Lower an f16 LOAD in case of no vector support.
 SDValue SystemZTargetLowering::lowerLoadF16(SDValue Op,
                                             SelectionDAG &DAG) const {

diff  --git a/llvm/lib/Target/SystemZ/SystemZISelLowering.h b/llvm/lib/Target/SystemZ/SystemZISelLowering.h
index 13a1cd1614a53..c7cc26c5527e6 100644
--- a/llvm/lib/Target/SystemZ/SystemZISelLowering.h
+++ b/llvm/lib/Target/SystemZ/SystemZISelLowering.h
@@ -77,14 +77,7 @@ class SystemZTargetLowering : public TargetLowering {
     return TargetLowering::getNumRegisters(Context, VT);
   }
   MVT getRegisterTypeForCallingConv(LLVMContext &Context, CallingConv::ID CC,
-                                    EVT VT) const override {
-    // 128-bit single-element vector types are passed like other vectors,
-    // not like their element type.
-    if (VT.isVector() && VT.getSizeInBits() == 128 &&
-        VT.getVectorNumElements() == 1)
-      return MVT::v16i8;
-    return TargetLowering::getRegisterTypeForCallingConv(Context, CC, VT);
-  }
+                                    EVT VT) const override;
   bool isCheapToSpeculateCtlz(Type *) const override { return true; }
   bool isCheapToSpeculateCttz(Type *) const override { return true; }
   bool preferZeroCompareBranch() const override { return true; }