[gcc r11-6566] VAX: Use a mode with `const_double_zero' expressions

[Maciej W. Rozycki]

https://gcc.gnu.org/g:c38bbf5eed1061634df192cf56086adc0410e7d8

commit r11-6566-gc38bbf5eed1061634df192cf56086adc0410e7d8
Author: Maciej W. Rozycki <macro@linux-mips.org>
Date:   Fri Jan 8 01:50:27 2021 +0000

    VAX: Use a mode with `const_double_zero' expressions
    
    For predictable semantics propagate the mode from operands referred by
    the FP substitution to the `const_double_zero' expressions used with the
    associated condition code calculation.  Use an iterator to make copies
    of the FP substitution across the FP modes supported as the substitution
    now has to match the mode of the operands.
    
            gcc/
            * config/vax/vax.md (subst_f<cc>): Add mode to operands and
            `const_double_zero'.

Diff:
---
 gcc/config/vax/vax.md | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/gcc/config/vax/vax.md b/gcc/config/vax/vax.md
index e5ab487c49d..49d3eab8a20 100644
--- a/gcc/config/vax/vax.md
+++ b/gcc/config/vax/vax.md
@@ -79,13 +79,13 @@
 	(match_dup 1))])
 
 (define_subst "subst_f<cc>"
-  [(set (match_operand 0 "")
-	(match_operand 1 ""))
+  [(set (match_operand:VAXfp 0 "")
+	(match_operand:VAXfp 1 ""))
    (clobber (reg:CC VAX_PSL_REGNUM))]
   ""
   [(set (reg:VAXccnz VAX_PSL_REGNUM)
 	(compare:VAXccnz (match_dup 1)
-			 (const_double_zero)))
+			 (const_double_zero:VAXfp)))
    (set (match_dup 0)
 	(match_dup 1))])