From afc9595cf9564a0aadb0350b928b4e0469b01b20 Mon Sep 17 00:00:00 2001
From: angie <angheloalf95@gmail.com>
Date: Fri, 27 Jan 2023 12:07:44 -0300
Subject: [PATCH] Fix incorrect emitted `subu` instead of `addu`.

From https://github.com/pmret/gcc-papermario/commit/1c2496114eef228715cafd473f28da7771548804
---
 .github/workflows/build.yml | 2 +-
 .gitignore                  | 7 +++++++
 gcc/cse.c                   | 2 +-
 3 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 96c2aac..e8134ce 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -31,7 +31,7 @@ jobs:
         if: matrix.TARGET.OS == 'ubuntu-20.04'
         run: |
           sudo apt-get update
-          sudo apt-get install -y build-essential bison file gperf gcc gcc-multilib
+          sudo apt-get install -y build-essential bison file gperf gcc gcc-multilib autoconf
       - name: Configure for mips
         shell: bash
         run: |
diff --git a/.gitignore b/.gitignore
index 6aa69e0..c9b4849 100644
--- a/.gitignore
+++ b/.gitignore
@@ -135,3 +135,10 @@ gcc/tree-check.h
 gcc/unprotoize
 gcc/xgcc
 gcc/xlimits.h
+
+gcc/autom4te.cache/requests
+gcc/autom4te.cache/output.*
+gcc/autom4te.cache/traces.*
+gcc/config.in~
+gcc/config.bak
+gcc/configure~
diff --git a/gcc/cse.c b/gcc/cse.c
index cfcc4fa..3c00b10 100644
--- a/gcc/cse.c
+++ b/gcc/cse.c
@@ -5602,7 +5602,7 @@ fold_rtx (x, insn)
 	     hence not save anything) or be incorrect.  */
 	  if (const_arg1 != 0 && GET_CODE (const_arg1) == CONST_INT
 	      && INTVAL (const_arg1) < 0
-	      && - INTVAL (const_arg1) >= 0
+	      && (-INTVAL (const_arg1) >> 0x1f) >= 0
 	      && GET_CODE (folded_arg1) == REG)
 	    {
 	      rtx new_const = GEN_INT (- INTVAL (const_arg1));