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* [gcc r12-2083] Use H8 nop moves as tst insns
@ 2021-07-06 15:00 Jeff Law
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From: Jeff Law @ 2021-07-06 15:00 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:73c49ff53235d92aba4ee748fcb06b06e83e0b8f
commit r12-2083-g73c49ff53235d92aba4ee748fcb06b06e83e0b8f
Author: Jeff Law <jeffreyalaw@gmail.com>
Date: Tue Jul 6 10:55:53 2021 -0400
Use H8 nop moves as tst insns
gcc
* config/h8300/jumpcall.md (*branch): When possible, generate
the comparison in CCZN mode.
* config/h8300/predicates.md (simple_memory_operand): Reject all
auto-increment addressing modes.
Diff:
---
gcc/config/h8300/jumpcall.md | 27 +++++++++++++++++++++++----
gcc/config/h8300/predicates.md | 2 ++
2 files changed, 25 insertions(+), 4 deletions(-)
diff --git a/gcc/config/h8300/jumpcall.md b/gcc/config/h8300/jumpcall.md
index 7b6a66a96ef..e1f04183564 100644
--- a/gcc/config/h8300/jumpcall.md
+++ b/gcc/config/h8300/jumpcall.md
@@ -23,13 +23,32 @@
""
"#"
"&& reload_completed"
- [(set (reg:H8cc CC_REG)
- (compare:H8cc (match_dup 1) (match_dup 2)))
+ [(set (match_dup 4)
+ (match_dup 5))
(set (pc)
(if_then_else (match_op_dup 0
- [(reg:H8cc CC_REG) (const_int 0)])
+ [(match_dup 4) (const_int 0)])
(label_ref (match_dup 3)) (pc)))]
- "")
+ "
+{
+ machine_mode mode;
+
+ if (REG_P (operands[1])
+ && operands[2] == const0_rtx
+ && (GET_CODE (operands[0]) == EQ
+ || GET_CODE (operands[0]) == NE
+ || GET_CODE (operands[0]) == LT
+ || GET_CODE (operands[0]) == GE
+ /* Our tstxx insns will set ZN and clear V, so we can handle
+ a couple additional cases. */
+ || GET_CODE (operands[0]) == LE
+ || GET_CODE (operands[0]) == GT))
+ mode = E_CCZNmode;
+ else
+ mode = E_CCmode;
+ operands[4] = gen_rtx_REG (mode, CC_REG);
+ operands[5] = gen_rtx_COMPARE (mode, operands[1], operands[2]);
+}")
(define_insn "*branch_1"
[(set (pc)
diff --git a/gcc/config/h8300/predicates.md b/gcc/config/h8300/predicates.md
index f4e3ed4f562..bed23e9a3e0 100644
--- a/gcc/config/h8300/predicates.md
+++ b/gcc/config/h8300/predicates.md
@@ -506,6 +506,8 @@
{
if (GET_MODE (op) == mode
&& (GET_CODE (XEXP (op, 0)) != PRE_DEC
+ && GET_CODE (XEXP (op, 0)) != PRE_INC
+ && GET_CODE (XEXP (op, 0)) != POST_DEC
&& GET_CODE (XEXP (op, 0)) != POST_INC))
return 1;
return 0;
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