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Re: PATCH: PR target/15383: __float128 function name is used forlong double

H. J. Lu wrote:
The HP interface has some additional functions. This patch changes
the common subset of TFmode functions with the HPUX conventions.

The patch looks mostly reasonable to me.

ia64_sysv4_init_libfuncs is missing an explanatory comment.

The comment inside this function is confusing.
+  /* HPUX doesn't use them.  */
I think this should be something like
 /* These functions are not part of the HPUX TFmode interface.  We use
    them instead of _U_Qfcmp, which doesn't work the way we expect.  */

Why didn't you put fmin, fmax, and fabs in the common ia64_init_libfuncs? They should be usable for linux. Is this just a matter of glibc not having them? If so, then perhaps a comment here would be uesful to point that out.

Zack mentioned ia64_expand_compare. It isn't clear if you looked at it. It has:

  /* HPUX TFmode compare requires a library call to _U_Qfcmp, which takes a
     magic number as its third argument, that indicates what to do.
     The return value is an integer to be compared against zero.  */
  else if (TARGET_HPUX && GET_MODE (op0) == TFmode)

I think this would be clearer if it was changed to check cmptf_libcall instead of TARGET_HPUX. That makes the connection between ia64_hpux_init_libfuncs a direct connection, instead of an indirect connection via TARGET_HPUX. It might also be useful to add an abort for the case where GET_MODE (op) == TFmode and cmptf_libcall is not set. In that case, we would fall through and generate an unrecognizable insn. It is perhaps better to abort, or give a suitable error, than to generate an unrecognizable insn. We should never reach here with TFmode if eq_optab etc are set.

Your set of comparisons by the way is incomplete. There is also unord_optab. This matters for FP comparisons like ordered, unordered, uneq, unge, ungt, unle, unlt, and ltgt.
Jim Wilson, GNU Tools Support,

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