From 0461d2ba6bf1aedbd0d39e5da4daf90137bf61a7 Mon Sep 17 00:00:00 2001
From: Richard-Qin-X <richard.qin.001@gmail.com>
Date: Wed, 19 Aug 2026 02:59:49 +0800
Subject: [RISCV][GlobalISel] Generate select instruction matching

---
 backend/lib/Target/RISCV/RISCVGISelInteger.rccdesc | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

(limited to 'backend/lib/Target/RISCV/RISCVGISelInteger.rccdesc')

diff --git a/backend/lib/Target/RISCV/RISCVGISelInteger.rccdesc b/backend/lib/Target/RISCV/RISCVGISelInteger.rccdesc
index f40e5d4..d217460 100644
--- a/backend/lib/Target/RISCV/RISCVGISelInteger.rccdesc
+++ b/backend/lib/Target/RISCV/RISCVGISelInteger.rccdesc
@@ -913,6 +913,27 @@ selection_rules:
             - { temporary: compare, flags: [use] }
             - { immediate: 1 }
       erase_operand_definitions: [3]
+  -
+    id: select_g_select_gpr
+    priority: 100
+    match:
+      opcode: G_SELECT
+      operand_banks:
+        - { index: 0, bank: GPR }
+        - { index: 1, bank: GPR }
+        - { index: 2, bank: GPR }
+        - { index: 3, bank: GPR }
+    apply:
+      instructions:
+        - opcode: Select_GPR_Using_CC_GPR
+          root: true
+          operands:
+            - { operand: 0 }
+            - { complex: select_condition_lhs, operand: 1 }
+            - { complex: select_condition_rhs, operand: 1 }
+            - { complex: select_condition_code, operand: 1 }
+            - { operand: 2 }
+            - { operand: 3 }
   -
     id: select_g_icmp_sgt_immediate
     priority: 400
-- 
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