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[committed] i386: Make flags_reg_operand a special predicate

Message ID CAFULd4b2+9yfrkZLbxR5T85pgScqbfNG_wsmz5F=teYXtOVwvQ@mail.gmail.com
State New
Headers show
Series [committed] i386: Make flags_reg_operand a special predicate | expand

Commit Message

Uros Bizjak Nov. 7, 2023, 6:36 p.m. UTC 
There is no need to check the mode in flags_reg_operand predicate. The
mode in flags setting instructions is checked with ix86_match_ccmode.

The patch avoids "warning: operand X missing mode?" warnings with
VOIDmode flags_reg_operand predicate.

gcc/ChangeLog:

    * config/i386/predicates.md ("flags_reg_operand"):
    Make predicate special to avoid automatic mode checks.

Bootstrapped and regression tested on x86_64-linux-gnu {,-m32}.

Uros.
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Patch

diff --git a/gcc/config/i386/predicates.md b/gcc/config/i386/predicates.md
index a63b8cd7be5..b5a86257c9e 100644
--- a/gcc/config/i386/predicates.md
+++ b/gcc/config/i386/predicates.md
@@ -88,7 +88,7 @@  (define_predicate "ax_reg_operand"
        (match_test "REGNO (op) == AX_REG")))
 
 ;; Return true if op is the flags register.
-(define_predicate "flags_reg_operand"
+(define_special_predicate "flags_reg_operand"
   (and (match_code "reg")
        (match_test "REGNO (op) == FLAGS_REG")))