commit e887624aca4ed2f63d5393daa5bec3ddc4a46e83
author David Green <david.green@arm.com> Fri Jun 21 10:24:57 2024 +0100
committer GitHub <noreply@github.com> Fri Jun 21 10:24:57 2024 +0100
tree c5c45bbe979b01f4ac8e5f0745481f8dedf5d46b
parent c2a22f1a720e88ba3b574175bd23c1fb0164b4c8

[AArch64][GlobalISel] Add fp128 and i128 fptosi/fptoui handling. (#95528)

Any fp128 need to end up as libcall, as will f32->i128 and f64->i128.
f16 are a bit special as the maximum range of the result fits in a i17,
so can be shrank to an i64. Vector with i128/fp128 types are scalarized.

llvm/lib/CodeGen/GlobalISel/LegalizerHelper.cpp

diff --git a/llvm/lib/CodeGen/GlobalISel/LegalizerHelper.cpp b/llvm/lib/CodeGen/GlobalISel/LegalizerHelper.cpp
index 223d1ea..430fcae 100644
--- a/llvm/lib/CodeGen/GlobalISel/LegalizerHelper.cpp
+++ b/llvm/lib/CodeGen/GlobalISel/LegalizerHelper.cpp
@@ -1123,15 +1123,13 @@
   case TargetOpcode::G_FPTOSI:
   case TargetOpcode::G_FPTOUI: {
     // FIXME: Support other types
-    unsigned FromSize = MRI.getType(MI.getOperand(1).getReg()).getSizeInBits();
+    Type *FromTy =
+        getFloatTypeForLLT(Ctx, MRI.getType(MI.getOperand(1).getReg()));
     unsigned ToSize = MRI.getType(MI.getOperand(0).getReg()).getSizeInBits();
-    if ((ToSize != 32 && ToSize != 64) || (FromSize != 32 && FromSize != 64))
+    if ((ToSize != 32 && ToSize != 64 && ToSize != 128) || !FromTy)
       return UnableToLegalize;
     LegalizeResult Status = conversionLibcall(
-        MI, MIRBuilder,
-        ToSize == 32 ? Type::getInt32Ty(Ctx) : Type::getInt64Ty(Ctx),
-        FromSize == 64 ? Type::getDoubleTy(Ctx) : Type::getFloatTy(Ctx),
-        LocObserver);
+        MI, MIRBuilder, Type::getIntNTy(Ctx, ToSize), FromTy, LocObserver);
     if (Status != Legalized)
       return Status;
     break;