[GlobalISel][AArch64] Add support for widening G_FCEIL
This adds support for widening G_FCEIL in LegalizerHelper and
AArch64LegalizerInfo. More specifically, it teaches the AArch64 legalizer to
widen G_FCEIL from a 16-bit float to a 32-bit float when the subtarget doesn't
support full FP 16.
This also updates AArch64/f16-instructions.ll to show that we perform the
correct transformation.
llvm-svn: 349927
diff --git a/llvm/lib/CodeGen/GlobalISel/LegalizerHelper.cpp b/llvm/lib/CodeGen/GlobalISel/LegalizerHelper.cpp
index 266409d..274bc4b 100644
--- a/llvm/lib/CodeGen/GlobalISel/LegalizerHelper.cpp
+++ b/llvm/lib/CodeGen/GlobalISel/LegalizerHelper.cpp
@@ -943,6 +943,15 @@
widenScalarSrc(MI, WideTy, 2, TargetOpcode::G_SEXT);
Observer.changedInstr(MI);
return Legalized;
+
+ case TargetOpcode::G_FCEIL:
+ if (TypeIdx != 0)
+ return UnableToLegalize;
+ Observer.changingInstr(MI);
+ widenScalarSrc(MI, WideTy, 1, TargetOpcode::G_FPEXT);
+ widenScalarDst(MI, WideTy, 0, TargetOpcode::G_FPTRUNC);
+ Observer.changedInstr(MI);
+ return Legalized;
}
}
