[llvm] [loongarch][DAG][FREEZE] Fix crash when FREEZE a half(f16) type on loongarch (PR #107791)

[YANG Xudong via llvm-commits]

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@@ -324,3 +320,61 @@ define void @test_fmul_mem(ptr %p, ptr %q) nounwind {
   store half %r, ptr %p
   ret void
 }
+
+define half @freeze_half_undef() nounwind {
+; LA32-LABEL: freeze_half_undef:
+; LA32:       # %bb.0:
+; LA32-NEXT:    addi.w $sp, $sp, -16
+; LA32-NEXT:    st.w $ra, $sp, 12 # 4-byte Folded Spill
+; LA32-NEXT:    movgr2fr.w $fa0, $zero
+; LA32-NEXT:    bl %plt(__gnu_f2h_ieee)
+; LA32-NEXT:    bl %plt(__gnu_h2f_ieee)
+; LA32-NEXT:    fadd.s $fa0, $fa0, $fa0
+; LA32-NEXT:    bl %plt(__gnu_f2h_ieee)
+; LA32-NEXT:    ld.w $ra, $sp, 12 # 4-byte Folded Reload
+; LA32-NEXT:    addi.w $sp, $sp, 16
+; LA32-NEXT:    ret
+;
+; LA64-LABEL: freeze_half_undef:
+; LA64:       # %bb.0:
+; LA64-NEXT:    addi.d $sp, $sp, -16
+; LA64-NEXT:    st.d $ra, $sp, 8 # 8-byte Folded Spill
+; LA64-NEXT:    movgr2fr.w $fa0, $zero
+; LA64-NEXT:    bl %plt(__gnu_f2h_ieee)
+; LA64-NEXT:    bl %plt(__gnu_h2f_ieee)
+; LA64-NEXT:    fadd.s $fa0, $fa0, $fa0
+; LA64-NEXT:    bl %plt(__gnu_f2h_ieee)
+; LA64-NEXT:    ld.d $ra, $sp, 8 # 8-byte Folded Reload
+; LA64-NEXT:    addi.d $sp, $sp, 16
+; LA64-NEXT:    ret
+  %y1 = freeze half undef
+  %t1 = fadd half %y1, %y1
+  ret half %t1
+}
+
+define half @freeze_half_poison(half %poison) nounwind {
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yxd-ym wrote:

fixed

https://github.com/llvm/llvm-project/pull/107791