optimize comparison with zero to TST #6
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ghost
reviewed
Mar 5, 2019
gcc/config/csky/abiv2_csky.md
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| @@ -3188,6 +3188,15 @@ | |||
| [(set_attr "type" "cmp")] | |||
| ) | |||
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| (define_insn "*cskyv2_tstsi2" | |||
| [(set (reg:CC CSKY_CC_REGNUM) (ne:CC (and:SI (match_operand:SI 0 "register_operand" "b") | |||
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The constraint should not only be "b", because 'tst rx, ry' support register range '0-31'. You can add another constraint 'r', the corresponding size constraint 'b' is 2, and the corresponding size constraint 'r' is 4
ghost
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