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mips.h (ISA_HAS_HILO_INTERLOCKS): MIPS32, MIPS32r2, and MIPS64 have HI/LO interlocks.

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2003-04-25  Chris Demetriou  <cgd@broadcom.com>

        * config/mips/mips.h (ISA_HAS_HILO_INTERLOCKS): MIPS32, MIPS32r2,
        and MIPS64 have HI/LO interlocks.  Update comment.

From-SVN: r76597
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Chris Demetriou 2004-01-25 23:45:48 +00:00 committed by Chris Demetriou
parent f942e78de9
commit fdcf1e1ed5
2 changed files with 20 additions and 3 deletions
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@ -1,3 +1,8 @@
2003-04-25 Chris Demetriou <cgd@broadcom.com>
* config/mips/mips.h (ISA_HAS_HILO_INTERLOCKS): MIPS32, MIPS32r2,
and MIPS64 have HI/LO interlocks. Update comment.
2004-01-25 Kazu Hirata <kazu@cs.umass.edu>
* config/stormy16/stormy16-protos.h: Remove the prototype for

18
gcc/config/mips/mips.h
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@ -942,9 +942,21 @@ extern const struct mips_cpu_info *mips_tune_info;
#define ISA_HAS_FCMP_DELAY (mips_isa <= 3)
/* True if mflo and mfhi can be immediately followed by instructions
which write to the HI and LO registers. Most targets require a
two-instruction gap. */
#define ISA_HAS_HILO_INTERLOCKS (TARGET_MIPS5500 || TARGET_SB1)
which write to the HI and LO registers.
According to MIPS specifications, MIPS ISAs I, II, and III need
(at least) two instructions between the reads of HI/LO and
instructions which write them, and later ISAs do not. Contradicting
the MIPS specifications, some MIPS IV processor user manuals (e.g.
the UM for the NEC Vr5000) document needing the instructions between
HI/LO reads and writes, as well. Therefore, we declare only MIPS32,
MIPS64 and later ISAs to have the interlocks, plus any specific
earlier-ISA CPUs for which CPU documentation declares that the
instructions are really interlocked. */
#define ISA_HAS_HILO_INTERLOCKS (ISA_MIPS32 \
|| ISA_MIPS32R2 \
|| ISA_MIPS64 \
|| TARGET_MIPS5500)
/* Add -G xx support. */