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PDP11: Use `const_double_zero' to express double zero constant

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We do not define a comparison operation between floating-point and
integer data, including integer zero constant.  Consequently the RTL
instruction stream presented to the post-reload comparison elimination
pass will include, where applicable, floating-point comparison insns
against `const_double:DF 0.0 [0x0.0p+0]' rather than `const_int 0 [0]',
meaning that the latter expression will not match when used in machine
description.

Use `const_double_zero' then for the relevant patterns to match the
intended RTL instructions.

	gcc/
	* config/pdp11/pdp11.md (fcc_cc, fcc_ccnz): Use
	`const_double_zero' to express double zero constant.
This commit is contained in:
Maciej W. Rozycki 2020-12-05 18:26:27 +00:00
parent 20ab43b5ca
commit c60d0736df
1 changed files with 2 additions and 2 deletions
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4
gcc/config/pdp11/pdp11.md
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@ -105,7 +105,7 @@
(clobber (reg FCC_REGNUM))]
""
[(set (reg:CC FCC_REGNUM)
(compare:CC (match_dup 1) (const_int 0)))
(compare:CC (match_dup 1) (const_double_zero)))
(set (match_dup 0) (match_dup 1))])
(define_subst "fcc_ccnz"
@ -113,7 +113,7 @@
(clobber (reg FCC_REGNUM))]
""
[(set (reg:CCNZ FCC_REGNUM)
(compare:CCNZ (match_dup 1) (const_int 0)))
(compare:CCNZ (match_dup 1) (const_double_zero)))
(set (match_dup 0) (match_dup 1))])
(define_subst_attr "cc_cc" "cc_cc" "_nocc" "_cc")