diff --git a/.gitattributes b/.gitattributes
index 222a15080c..8a2bb4de10 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -14929,6 +14929,7 @@ tests/webtbs/tw2942b.pp svneol=native#text/plain
 tests/webtbs/tw2943.pp svneol=native#text/plain
 tests/webtbs/tw2944.pp svneol=native#text/plain
 tests/webtbs/tw2946.pp svneol=native#text/plain
+tests/webtbs/tw29471.pp svneol=native#text/plain
 tests/webtbs/tw2949.pp svneol=native#text/plain
 tests/webtbs/tw2953.pp svneol=native#text/plain
 tests/webtbs/tw29546.pp svneol=native#text/pascal
diff --git a/compiler/x86/cpubase.pas b/compiler/x86/cpubase.pas
index 2292ca54df..cb3066d837 100644
--- a/compiler/x86/cpubase.pas
+++ b/compiler/x86/cpubase.pas
@@ -183,9 +183,6 @@ uses
 {$endif}
 
     const
-{ TODO: Calculate bsstart}
-      regnumber_count_bsstart = 64;
-
       regnumber_table : array[tregisterindex] of tregister = (
 {$if defined(x86_64)}
         {$i r8664num.inc}
diff --git a/compiler/x86/itcpugas.pas b/compiler/x86/itcpugas.pas
index 37eb631cb3..d1a9388fcb 100644
--- a/compiler/x86/itcpugas.pas
+++ b/compiler/x86/itcpugas.pas
@@ -105,11 +105,11 @@ interface
 implementation
 
     uses
-      cutils,verbose;
+      cutils,verbose,rgbase;
 
     const
     {$if defined(x86_64)}
-      att_regname_table : array[tregisterindex] of string[7] = (
+      att_regname_table : TRegNameTable = (
         {r8664att.inc contains the AT&T name of each register.}
         {$i r8664att.inc}
       );
@@ -120,7 +120,7 @@ implementation
         {$i r8664ari.inc}
       );
     {$elseif defined(i386)}
-      att_regname_table : array[tregisterindex] of string[7] = (
+      att_regname_table : TRegNameTable = (
         {r386att.inc contains the AT&T name of each register.}
         {$i r386att.inc}
       );
@@ -131,7 +131,7 @@ implementation
         {$i r386ari.inc}
       );
     {$elseif defined(i8086)}
-      att_regname_table : array[tregisterindex] of string[7] = (
+      att_regname_table : TRegNameTable = (
         {r8086att.inc contains the AT&T name of each register.}
         {$i r8086att.inc}
       );
@@ -143,28 +143,11 @@ implementation
       );
     {$endif}
 
-    function findreg_by_attname(const s:string):byte;
-      var
-        i,p : tregisterindex;
-      begin
-        {Binary search.}
-        p:=0;
-        i:=regnumber_count_bsstart;
-        repeat
-          if (p+i<=high(tregisterindex)) and (att_regname_table[att_regname_index[p+i]]<=s) then
-            p:=p+i;
-          i:=i shr 1;
-        until i=0;
-        if att_regname_table[att_regname_index[p]]=s then
-          findreg_by_attname:=att_regname_index[p]
-        else
-          findreg_by_attname:=0;
-      end;
 
 
     function gas_regnum_search(const s:string):Tregister;
       begin
-        result:=regnumber_table[findreg_by_attname(s)];
+        result:=regnumber_table[findreg_by_name_table(s,att_regname_table,att_regname_index)];
       end;
 
 
diff --git a/tests/webtbs/tw29471.pp b/tests/webtbs/tw29471.pp
new file mode 100644
index 0000000000..edf8091eba
--- /dev/null
+++ b/tests/webtbs/tw29471.pp
@@ -0,0 +1,24 @@
+{ %cpu=x86_64 }
+{ %norun }
+program avxtest;
+
+ {$ASMMODE ATT}
+
+ type
+   TSIMDWord = packed array[0..3] of Double;
+
+ procedure SIMDAddWord(var A, B, ARes);assembler;
+ asm
+         vmovdqu (%rdi), %ymm2 // <- error 1
+         vmovdqu (%rsi), %ymm1
+         vaddpd %ymm1, %ymm2, %ymm0 // <- error 2
+         vmovdqu %ymm0, (%rdx)
+ end;
+
+ var
+    V1, V2, Res : TSIMDWord;
+
+ begin
+    SIMDAddWord(V1, V2, Res);
+ end.
+ 
\ No newline at end of file