[llvm] [M68k] Use `softPromoteHalfType` (PR #175140)

[Trevor Gross via llvm-commits]

https://github.com/tgross35 created https://github.com/llvm/llvm-project/pull/175140

Follow suite from other targets.

Fixes the M68kportion of https://github.com/llvm/llvm-project/issues/97975 Fixes the M68k portion of https://github.com/llvm/llvm-project/issues/97981

>From af22d6edcd90e6195c37b78a821cac3ca84ad471 Mon Sep 17 00:00:00 2001
From: Trevor Gross <tg at trevorgross.com>
Date: Thu, 8 Jan 2026 23:06:32 -0600
Subject: [PATCH] [M68k] Use `softPromoteHalfType`

Follow suite from other targets.

Fixes the M68kportion of https://github.com/llvm/llvm-project/issues/97975
Fixes the M68k portion of https://github.com/llvm/llvm-project/issues/97981
---
 llvm/lib/Target/M68k/M68kISelLowering.h | 2 ++
 llvm/test/CodeGen/Generic/half-op.ll    | 2 +-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/llvm/lib/Target/M68k/M68kISelLowering.h b/llvm/lib/Target/M68k/M68kISelLowering.h
index 3774f93c851e8..b7e3dd736ea6e 100644
--- a/llvm/lib/Target/M68k/M68kISelLowering.h
+++ b/llvm/lib/Target/M68k/M68kISelLowering.h
@@ -253,6 +253,8 @@ class M68kTargetLowering : public TargetLowering {
       const SmallVectorImpl<ISD::InputArg> &Ins, SelectionDAG &DAG) const;
 
   SDValue PerformDAGCombine(SDNode *N, DAGCombinerInfo &DCI) const override;
+
+  bool softPromoteHalfType() const override { return true; }
 };
 } // namespace llvm
 
diff --git a/llvm/test/CodeGen/Generic/half-op.ll b/llvm/test/CodeGen/Generic/half-op.ll
index f08c71b187eb1..c735cf704a1fd 100644
--- a/llvm/test/CodeGen/Generic/half-op.ll
+++ b/llvm/test/CodeGen/Generic/half-op.ll
@@ -20,7 +20,7 @@
 ; RUN: %if loongarch-registered-target   %{ llc %s -o - -mtriple=loongarch32-unknown-linux-gnu   | FileCheck %s --check-prefixes=ALL,CHECK-NEG-ABS,CHECK-COPYSIGN,CHECK-FMA %}
 ; RUN: %if loongarch-registered-target   %{ llc %s -o - -mtriple=loongarch64-unknown-linux-gnu   | FileCheck %s --check-prefixes=ALL,CHECK-NEG-ABS,CHECK-COPYSIGN,CHECK-FMA %}
 ; RUN: %if loongarch-registered-target   %{ llc %s -o - -mtriple=loongarch64-unknown-linux-gnu -mattr=+f | FileCheck %s --check-prefixes=ALL,CHECK-NEG-ABS,CHECK-COPYSIGN,CHECK-FMA %}
-; RUN: %if m68k-registered-target        %{ llc %s -o - -mtriple=m68k-unknown-linux-gnu          | FileCheck %s --check-prefixes=ALL,BAD-NEG-ABS,BAD-COPYSIGN,BAD-FMA %}
+; RUN: %if m68k-registered-target        %{ llc %s -o - -mtriple=m68k-unknown-linux-gnu          | FileCheck %s --check-prefixes=ALL,CHECK-NEG-ABS,CHECK-COPYSIGN,CHECK-FMA %}
 ; RUN: %if mips-registered-target        %{ llc %s -o - -mtriple=mips-unknown-linux-gnu          | FileCheck %s --check-prefixes=ALL,CHECK-NEG-ABS,CHECK-COPYSIGN,CHECK-FMA %}
 ; RUN: %if mips-registered-target        %{ llc %s -o - -mtriple=mips64-unknown-linux-gnuabi64   | FileCheck %s --check-prefixes=ALL,CHECK-NEG-ABS,CHECK-COPYSIGN,CHECK-FMA %}
 ; RUN: %if mips-registered-target        %{ llc %s -o - -mtriple=mips64el-unknown-linux-gnuabi64 | FileCheck %s --check-prefixes=ALL,CHECK-NEG-ABS,CHECK-COPYSIGN,CHECK-FMA %}