Merge pull request wasmerio#3462 from wasmerio/singlepass_fix_sse42_b…

…ackend [SINGLEPASS] Added a special case on SSE4.2 backend when dst == src1
websecresearch · Jan 5, 2023 · 256a97e · 256a97e
2 parents 0e81d2f + 1d96053
commit 256a97e
Showing 1 changed file with 6 additions and 3 deletions.
diff --git a/lib/compiler-singlepass/src/emitter_x64.rs b/lib/compiler-singlepass/src/emitter_x64.rs
@@ -739,9 +739,12 @@ macro_rules! sse_fn {
         |emitter: &mut AssemblerX64, precision: Precision, src1: XMM, src2: XMMOrMemory, dst: XMM| {
             match src2 {
                 XMMOrMemory::XMM(x) => {
-                    assert_ne!(x, dst);
-                    move_src_to_dst(emitter, precision, src1, dst);
-                    dynasm!(emitter ; $ins Rx((dst as u8)), Rx((x as u8)))
+                    if x == dst {
+                        dynasm!(emitter ; $ins Rx((dst as u8)), Rx((src1 as u8)))
+                    } else {
+                        move_src_to_dst(emitter, precision, src1, dst);
+                        dynasm!(emitter ; $ins Rx((dst as u8)), Rx((x as u8)))
+                    }
                 }
                 XMMOrMemory::Memory(base, disp) => {
                     move_src_to_dst(emitter, precision, src1, dst);