Hi,
We are working on a new optimization, which turns off TARGET_MOVX.
GCC generates:
movb %ah, %dil
But %ah can only be used with %[abcd][hl]. This patch adds QIreg_operand
and uses it in *movqi_extv_1_rex64/*movqi_extzv_2_rex64. OK for trunk
if there is no regression?
Thanks.
H.J.
---
2011-05-24 H.J. Lu <hongjiu...@intel.com>
PR target/49142
* config/i386/i386.md (*movqi_extv_1_rex64): Replace
q_regs_operand with QIreg_operand.
(*movqi_extzv_2_rex64): Likewise.
* config/i386/predicates.md (QIreg_operand): New.
diff --git a/gcc/config/i386/i386.md b/gcc/config/i386/i386.md
index 6c158cf..b7f5866 100644
--- a/gcc/config/i386/i386.md
+++ b/gcc/config/i386/i386.md
@@ -2635,7 +2635,7 @@
}
[(set (attr "type")
(if_then_else (and (match_operand:QI 0 "register_operand" "")
- (ior (not (match_operand:QI 0 "q_regs_operand" ""))
+ (ior (not (match_operand:QI 0 "QIreg_operand" ""))
(ne (symbol_ref "TARGET_MOVX")
(const_int 0))))
(const_string "imovx")
@@ -2699,7 +2699,7 @@
}
}
[(set (attr "type")
- (if_then_else (ior (not (match_operand:QI 0 "q_regs_operand" ""))
+ (if_then_else (ior (not (match_operand:QI 0 "QIreg_operand" ""))
(ne (symbol_ref "TARGET_MOVX")
(const_int 0)))
(const_string "imovx")
diff --git a/gcc/config/i386/predicates.md b/gcc/config/i386/predicates.md
index 8a89f70..1471f5a 100644
--- a/gcc/config/i386/predicates.md
+++ b/gcc/config/i386/predicates.md
@@ -82,6 +82,10 @@
(and (match_code "reg")
(match_test "REGNO (op) == FLAGS_REG")))
+;; Return true if op is one of QImode registers: %[abcd][hl].
+(define_predicate "QIreg_operand"
+ (match_test "QI_REG_P (op)"))
+
;; Return true if op is a QImode register operand other than
;; %[abcd][hl].
(define_predicate "ext_QIreg_operand"
