diff --git a/crates/xenia-cpu/src/interpreter.rs b/crates/xenia-cpu/src/interpreter.rs
index e4d88cd..051aa4f 100644
--- a/crates/xenia-cpu/src/interpreter.rs
+++ b/crates/xenia-cpu/src/interpreter.rs
@@ -2777,12 +2777,18 @@ fn execute(ctx: &mut PpcContext, mem: &dyn MemoryAccess, instr: &DecodedInstr) -
             ctx.pc += 4;
         }
         PpcOpcode::fresx => {
-            // Single-precision reciprocal estimate: frD = 1.0 / frB
-            let b = ctx.fpr[instr.rb()];
+            // Single-precision reciprocal estimate: frD = 1.0 / frB.
+            // PPCBUG-184: pre-quantize input to f32 to match canary's
+            // `f.Recip(f.Convert(frB, FLOAT32_TYPE))` behavior. Hardware
+            // produces a ~12-bit LUT estimate; both emulators produce a
+            // fully-IEEE single reciprocal, but the f32 quantization at
+            // least makes the input precision match.
+            let b_full = ctx.fpr[instr.rb()];
+            let b = b_full as f32 as f64;
             if b == 0.0 {
                 fpscr::set_exception(ctx, fpscr::ZX);
             }
-            if fpscr::is_snan(b) {
+            if fpscr::is_snan(b_full) {
                 fpscr::set_exception(ctx, fpscr::VXSNAN);
             }
             let result = to_single(ctx, 1.0 / b);