[Feature] Support fp8 on gfx938 (for fp8 moe backend)

vllm/platforms/rocm.py

@@ -188,6 +188,7 @@ _ON_GFX1X = any(arch in _GCN_ARCH for arch in ["gfx11", "gfx12"])
 _ON_GFX12X = any(arch in _GCN_ARCH for arch in ["gfx12"])
 _ON_MI3XX = any(arch in _GCN_ARCH for arch in ["gfx942", "gfx950"])
 _ON_GFX9 = any(arch in _GCN_ARCH for arch in ["gfx90a", "gfx942", "gfx950"])
+_ON_GFX938 = "gfx938" in _GCN_ARCH
 _ON_GFX90A = "gfx90a" in _GCN_ARCH
 _ON_GFX942 = "gfx942" in _GCN_ARCH
 _ON_GFX950 = "gfx950" in _GCN_ARCH
@@ -279,6 +280,9 @@ def on_mi3xx() -> bool:
 def on_gfx9() -> bool:
     return _ON_GFX9
 
+def on_gfx938() -> bool:
+    return _ON_GFX938
+
 
 def on_gfx90a() -> bool:
     return _ON_GFX90A
@@ -802,7 +806,7 @@ class RocmPlatform(Platform):
 
     @classmethod
     def supports_fp8(cls) -> bool:
-        return on_gfx9() or on_gfx12x()
+        return on_gfx938() or on_gfx9() or on_gfx12x()
 
     @classmethod
     def is_fp8_fnuz(cls) -> bool: