From 59a1fde2a1421561f57d7b931883cb7ce1739e9d Mon Sep 17 00:00:00 2001
From: Thomas Harte <thomas.harte@gmail.com>
Date: Sun, 3 Apr 2022 20:37:09 -0400
Subject: [PATCH] Fix is_zero_mask.

---
 InstructionSets/PowerPC/Instruction.hpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/InstructionSets/PowerPC/Instruction.hpp b/InstructionSets/PowerPC/Instruction.hpp
index b0b742791..89d6959d7 100644
--- a/InstructionSets/PowerPC/Instruction.hpp
+++ b/InstructionSets/PowerPC/Instruction.hpp
@@ -59,9 +59,9 @@ enum class BranchOption: uint32_t {
 
 /// @returns @c 0 if reg == 0; @c ~0 otherwise.
 /// @discussion Provides a branchless way to substitute the value 0 for the value of r0
-/// in affected instructions.
+/// in affected instructions. Assumes arithmetic shifts.
 template <typename IntT> constexpr IntT is_zero_mask(uint32_t reg) {
-	return ~IntT((reg - 1) >> 5);
+	return ~IntT((int(reg) - 1) >> 5);
 }
 
 enum class Operation: uint8_t {