[PATCH/MIPS] Use ins/dins instruction when written manually

[Andrew Pinski <andrew dot pinski at caviumnetworks dot com>]

Hi,
  Right now we only produce ins when a zero_extract is used on the
right hand side.  We can do better by adding some patterns which
combine for the ins instruction.  This patch adds those patterns and a
testcase which shows a simple example where the code is improved.

OK?  Bootstrapped and tested on mips64-linux-gnu with no regressions.

Thanks,
Andrew Pinski

ChangeLog:
Andrew Pinski  <apinski@cavium.com>
Adam Nemet  <anemet@caviumnetworks.com>

	* config/mips/mips-protos.h (mips_bitmask, mips_bitmask_p,
        mips_bottom_bitmask_p): Declare them.
	* config/mips/mips.c (mips_bitmask, mips_bitmask_p,
        mips_bottom_bitmask_p): New functions.
	* config/mips/mips.md (*insv<mode>_internal1): New pattern to
	match a bottom insert.
	(*insv<mode>_internal2): Likewise.
	(*insv<mode>_internal3): New pattern to
	match an insert.
	(*insv<mode>_internal4): Likewise.
        * config/mips/predicates.md (bitmask_operand
        bottom_bitmask_operand, inverse_bitmask_operand):
        New predicates.

	* testsuite/gcc.target/mips/ins-4.c: New testcase.

Attachment: improveins.diff.txt
Description: Text document