From: Richard Earnshaw <rearnsha@arm.com>
Date: Tue, 5 Mar 2024 17:21:43 +0000 (+0000)
Subject: arm: check for low register before applying peephole [PR113510]
X-Git-Tag: basepoints/gcc-15~817
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=067a012bde15bfb62d9af309d9d524ebfe91b705;p=thirdparty%2Fgcc.git

arm: check for low register before applying peephole [PR113510]

For thumb1, when using a peephole to fuse

	mov reg, #const
	add reg, reg, SP

into

	add reg, SP, #const

we must first check that reg is a low register, otherwise we will ICE
when trying to recognize the resulting insn.

gcc/ChangeLog:

	PR target/113510
	* config/arm/thumb1.md (peephole2 to fuse mov imm/add SP): Use
	low_register_operand.
---

diff --git a/gcc/config/arm/thumb1.md b/gcc/config/arm/thumb1.md
index 14d6df580afe..d7074b43f601 100644
--- a/gcc/config/arm/thumb1.md
+++ b/gcc/config/arm/thumb1.md
@@ -113,7 +113,7 @@
 ;; Reloading and elimination of the frame pointer can
 ;; sometimes cause this optimization to be missed.
 (define_peephole2
-  [(set (match_operand:SI 0 "arm_general_register_operand" "")
+  [(set (match_operand:SI 0 "low_register_operand" "")
 	(match_operand:SI 1 "const_int_operand" ""))
    (set (match_dup 0)
 	(plus:SI (match_dup 0) (reg:SI SP_REGNUM)))]