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* config/arm/arm.md (mulsidi3, umulsidi3, mulsi3_highpart) (umulsi3_highpart): Make into expanders; existing insns are now named *[insn]_nov6. Add stars to existing [insn]_v6 counterparts' names.
+(define_expand "umulsi3_highpart" ... + (clobber (match_scratch:SI 3 "=&r,&r"))])]
Constraints aren't meaningful in an expander. You removed them from smulsi3_highpart, so I assume this is an oversight.
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