diff --git a/cranelift/codegen/src/isa/x64/inst/args.rs b/cranelift/codegen/src/isa/x64/inst/args.rs
index 16acafc940..fc441c302b 100644
--- a/cranelift/codegen/src/isa/x64/inst/args.rs
+++ b/cranelift/codegen/src/isa/x64/inst/args.rs
@@ -444,6 +444,7 @@ pub enum SseOpcode {
     Pmulld,
     Pmullw,
     Pmuludq,
+    Por,
     Pshufb,
     Pshufd,
     Psllw,
@@ -566,6 +567,7 @@ impl SseOpcode {
             | SseOpcode::Pminub
             | SseOpcode::Pmullw
             | SseOpcode::Pmuludq
+            | SseOpcode::Por
             | SseOpcode::Pshufd
             | SseOpcode::Psllw
             | SseOpcode::Pslld
@@ -717,6 +719,7 @@ impl fmt::Debug for SseOpcode {
             SseOpcode::Pmulld => "pmulld",
             SseOpcode::Pmullw => "pmullw",
             SseOpcode::Pmuludq => "pmuludq",
+            SseOpcode::Por => "por",
             SseOpcode::Pshufb => "pshufb",
             SseOpcode::Pshufd => "pshufd",
             SseOpcode::Psllw => "psllw",
diff --git a/cranelift/codegen/src/isa/x64/inst/emit.rs b/cranelift/codegen/src/isa/x64/inst/emit.rs
index b4524eb5d3..71d81c2e4f 100644
--- a/cranelift/codegen/src/isa/x64/inst/emit.rs
+++ b/cranelift/codegen/src/isa/x64/inst/emit.rs
@@ -1809,6 +1809,7 @@ pub(crate) fn emit(
                 SseOpcode::Pmulld => (LegacyPrefixes::_66, 0x0F3840, 3),
                 SseOpcode::Pmullw => (LegacyPrefixes::_66, 0x0FD5, 2),
                 SseOpcode::Pmuludq => (LegacyPrefixes::_66, 0x0FF4, 2),
+                SseOpcode::Por => (LegacyPrefixes::_66, 0x0FEB, 2),
                 SseOpcode::Pshufb => (LegacyPrefixes::_66, 0x0F3800, 3),
                 SseOpcode::Psubb => (LegacyPrefixes::_66, 0x0FF8, 2),
                 SseOpcode::Psubd => (LegacyPrefixes::_66, 0x0FFA, 2),