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"Gcc-patches" Like noticed for gas as well (binutils-gdb commit c8cad9d389b7), the "absolute difference" aspect of the insns makes their source operands commutative. gcc/ 2022-05-XX Jan Beulich * config/i386/mmx.md (mmx_psadbw): Mark as commutative. * config/i386/sse.md (_psadbw): Likewise. --- a/gcc/config/i386/mmx.md +++ b/gcc/config/i386/mmx.md @@ -4407,7 +4407,7 @@ (define_insn "mmx_psadbw" [(set (match_operand:V1DI 0 "register_operand" "=y,x,Yw") - (unspec:V1DI [(match_operand:V8QI 1 "register_operand" "0,0,Yw") + (unspec:V1DI [(match_operand:V8QI 1 "register_operand" "%0,0,Yw") (match_operand:V8QI 2 "register_mmxmem_operand" "ym,x,Yw")] UNSPEC_PSADBW))] "(TARGET_MMX || TARGET_MMX_WITH_SSE) --- a/gcc/config/i386/sse.md +++ b/gcc/config/i386/sse.md @@ -19983,7 +19983,7 @@ (define_insn "_psadbw" [(set (match_operand:VI8_AVX2_AVX512BW 0 "register_operand" "=x,YW") (unspec:VI8_AVX2_AVX512BW - [(match_operand: 1 "register_operand" "0,YW") + [(match_operand: 1 "register_operand" "%0,YW") (match_operand: 2 "vector_operand" "xBm,YWm")] UNSPEC_PSADBW))] "TARGET_SSE2"