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2013-02-04 Paulo Andrade <pcpa@gnu.org> * include/lightning.h, include/lightning/jit_private.h, lib/jit_arm-cpu.c, lib/jit_arm.c, lib/jit_mips-cpu.c, lib/jit_mips.c, lib/jit_ppc-cpu.c, lib/jit_ppc.c, lib/jit_x86-cpu.c, lib/jit_x86.c, lib/lightning.c: Implement the new qmul and qdiv instructions that return signed and unsigned lo/hi multiplication result and div/rem division result. These should be useful for jit translation of code that needs to know if a multiplication overflows (no branch opcode added) or if a division is exact (easy check if remainder is zero). * check/lightning.c, lib/jit_print.c, check/Makefile.am, check/all.tst: Update for the new qmul and qdiv instructions. * check/qalu.inc, check/qalu_div.ok, check/qalu_div.tst, check/qalu_mul.ok, check/qalu_mul.tst: New files implementing simple test cases for qmul and qdiv.
30 lines
1.2 KiB
Text
30 lines
1.2 KiB
Text
* Update documentation to match new implementation.
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* Make an sparc port to not remove previous functionality.
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* Add two new base instructions to help dynamically typed
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languages, that use two result registers and two argument
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registers, implementing multiplication and quotient+remainder
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return from division. Alternatively, can add branch codes
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for multiplication that overflows (and reverse for no
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overflow) and division with zero remainder or non zero
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remainder.
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Suggested names for now are "qmul" and "qdiv", with "r"
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and "i" variants, and possibly unsigned version. Branches
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would use "bo" and "bx" prefix.
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* Convert retr to an actual node, otherwise, code like:
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movi %r0 1
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divr %r1 %r2 %r3
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retr %r0
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will fail in x86 because, besides "divr" telling it clobbers
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%rax (r0) it ends being ignored because retr is a noop there
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(removed "mov %rax,%rax" expansion) and the code checking for
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live registers ends up not knowing about %rax being live after
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the "divr". This affects only x86.
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* Validate that divrem in jit_x86-cpu.c is not modifying
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the non result arguments. This is not verified by clobber.tst,
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as it only checks registers not involved in the operation
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(because it does not know about values being set as input
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for the the operation).
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