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rs6000: remove unused splitter on const_scalar_int_operand

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There are two splitters, both are calling rs6000_emit_set_const to emit
instructions for constant building.
One splitter checks `const_int_operand`, this splitter is always used.
Another spitter checks `const_scalar_int_operand`, this one is never
used now.

Checking the history, that splitter is introduced around 1999 for
HOST_BITS_PER_WIDE_INT=32, as below:

(define_split
  [(set (match_operand:DI 0 "gpc_reg_operand" "")
	(match_operand:DI 1 "const_double_operand" ""))]
  "HOST_BITS_PER_WIDE_INT == 32 && TARGET_POWERPC64
   && num_insns_constant (operands[1], DImode) > 1"

And `HOST_BITS_PER_WIDE_INT == 32` is eliminated later, since it is
`const_double_operand` can cover it.
When wide_int is introduced, `const_double_operand` is replaced by
`const_scalar_int_operand`.

Now, HOST_BITS_PER_WIDE_INT is forced to 64, this splitter is safe
to remove.

gcc/ChangeLog:

	* config/rs6000/rs6000.md (const_scalar_int splitter): Remove.
This commit is contained in:
Jiufu Guo 2022-09-07 13:32:55 +08:00
parent 34ea461fdb
commit ea6e89e07f
1 changed files with 0 additions and 12 deletions
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12
gcc/config/rs6000/rs6000.md
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@ -9712,18 +9712,6 @@
FAIL;
})
(define_split
[(set (match_operand:DI 0 "int_reg_operand_not_pseudo")
(match_operand:DI 1 "const_scalar_int_operand"))]
"TARGET_POWERPC64 && num_insns_constant (operands[1], DImode) > 1"
[(pc)]
{
if (rs6000_emit_set_const (operands[0], operands[1]))
DONE;
else
FAIL;
})
(define_split
[(set (match_operand:DI 0 "altivec_register_operand")
(match_operand:DI 1 "s5bit_cint_operand"))]