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m68k.c (notice_update_cc): If an SFmode move is implemented using move.l...

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gcc/
	* config/m68k/m68k.c (notice_update_cc): If an SFmode move is
	implemented using move.l, do not use its cc result for floating-point
	comparisons.

From-SVN: r120962
This commit is contained in:
Richard Sandiford 2007-01-19 13:40:54 +00:00 committed by Richard Sandiford
parent fe0cc77654
commit f6ab62e8ea
2 changed files with 14 additions and 2 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2007-01-19 Richard Sandiford <richard@codesourcery.com>
* config/m68k/m68k.c (notice_update_cc): If an SFmode move is
implemented using move.l, do not use its cc result for floating-point
comparisons.
2007-01-19 Richard Sandiford <richard@codesourcery.com>
* config/m68k/m68k.h (EXTRA_CONSTRAINT): Stop the 'T' constraint

10
gcc/config/m68k/m68k.c
View File

@ -2834,12 +2834,18 @@ notice_update_cc (rtx exp, rtx insn)
if (cc_status.value2 && modified_in_p (cc_status.value2, insn))
cc_status.value2 = 0;
}
/* fmoves to memory or data registers do not set the condition
codes. Normal moves _do_ set the condition codes, but not in
a way that is appropriate for comparison with 0, because -0.0
would be treated as a negative nonzero number. Note that it
isn't appropriate to conditionalize this restiction on
HONOR_SIGNED_ZEROS because that macro merely indicates whether
we care about the difference between -0.0 and +0.0. */
else if (!FP_REG_P (SET_DEST (exp))
&& SET_DEST (exp) != cc0_rtx
&& (FP_REG_P (SET_SRC (exp))
|| GET_CODE (SET_SRC (exp)) == FIX
|| GET_CODE (SET_SRC (exp)) == FLOAT_TRUNCATE
|| GET_CODE (SET_SRC (exp)) == FLOAT_EXTEND))
|| FLOAT_MODE_P (GET_MODE (SET_DEST (exp)))))
CC_STATUS_INIT;
/* A pair of move insns doesn't produce a useful overall cc. */
else if (!FP_REG_P (SET_DEST (exp))