motiejus/zig

commit 7f96ca101aec59e0c5508939c9ccc783d3898c2a (tree)
parent 852c82084163eec9911384b325dbd5713ee4df90
Author: Jakub Konka <kubkon@jakubkonka.com>
Date:   Sat, 14 May 2022 22:07:24 +0200

arm: sub_with_overflow should always track V flag

Diffstat:
M
src/arch/arm/CodeGen.zig
 | 
4
++++

1 file changed, 4 insertions(+), 0 deletions(-)
diff --git a/src/arch/arm/CodeGen.zig b/src/arch/arm/CodeGen.zig
@@ -1455,6 +1455,10 @@ fn airOverflow(self: *Self, inst: Air.Inst.Index) !void {
                         }
                     };
 
+                    if (tag == .sub_with_overflow) {
+                        break :result MCValue{ .register_v_flag = dest.register };
+                    }
+
                     switch (int_info.signedness) {
                         .unsigned => break :result MCValue{ .register_c_flag = dest.register },
                         .signed => break :result MCValue{ .register_v_flag = dest.register },