From 9c39d5720f4d06bf3e4f14ec50d702b50c9f0cdd Mon Sep 17 00:00:00 2001
From: Andrew Kelley <andrew@ziglang.org>
Date: Sat, 13 Jul 2019 18:38:52 -0400
Subject: ir: add an assertion in phi analysis

---
 src/ir.cpp | 1 +
 1 file changed, 1 insertion(+)

(limited to 'src/ir.cpp')

diff --git a/src/ir.cpp b/src/ir.cpp
index 616bb23132..5193a63ec4 100644
--- a/src/ir.cpp
+++ b/src/ir.cpp
@@ -17129,6 +17129,7 @@ static IrInstruction *ir_analyze_instruction_phi(IrAnalyze *ira, IrInstructionPh
     for (size_t i = 0; i < new_incoming_values.length; i += 1) {
         IrInstruction *new_value = new_incoming_values.at(i);
         IrBasicBlock *predecessor = new_incoming_blocks.at(i);
+        ir_assert(predecessor->instruction_list.length != 0, &phi_instruction->base);
         IrInstruction *branch_instruction = predecessor->instruction_list.pop();
         ir_set_cursor_at_end(&ira->new_irb, predecessor);
         IrInstruction *casted_value = ir_implicit_cast(ira, new_value, resolved_type);
-- 
cgit v1.2.3