--- a/doc/manual/callconvs/callconv_x86.tex	Sun Mar 20 18:44:41 2016 +0100
+++ b/doc/manual/callconvs/callconv_x86.tex	Mon Mar 21 01:15:37 2016 +0100
@@ -46,7 +46,7 @@
 \paragraph{Registers and register usage}
 
 \begin{table}[h]
-\begin{tabular}{3 B}
+\begin{tabular*}{0.75\textwidth}{3 B}
 \hline
 Name          & Brief description\\
 \hline
@@ -61,7 +61,7 @@
 {\bf st0}     & scratch, floating point return value\\
 {\bf st1-st7} & scratch\\
 \hline
-\end{tabular}
+\end{tabular*}
 \caption{Register usage on x86 cdecl calling convention}
 \end{table}
 
@@ -120,7 +120,7 @@
 \paragraph{Registers and register usage}
 
 \begin{table}[h]
-\begin{tabular}{3 B}
+\begin{tabular*}{0.75\textwidth}{3 B}
 \hline
 Name          & Brief description\\
 \hline
@@ -135,7 +135,7 @@
 {\bf st0}     & scratch, floating point return value\\
 {\bf st1-st7} & scratch\\
 \hline
-\end{tabular}
+\end{tabular*}
 \caption{Register usage on x86 fastcall (MS) calling convention}
 \end{table}
 
@@ -197,7 +197,7 @@
 \paragraph{Registers and register usage}
 
 \begin{table}[h]
-\begin{tabular}{3 B}
+\begin{tabular*}{0.75\textwidth}{3 B}
 \hline
 Name          & Brief description\\
 \hline
@@ -212,7 +212,7 @@
 {\bf st0}     & scratch, floating point return value\\
 {\bf st1-st7} & scratch\\
 \hline
-\end{tabular}
+\end{tabular*}
 \caption{Register usage on x86 fastcall (GNU) calling convention}
 \end{table}
 
@@ -271,7 +271,7 @@
 \paragraph{Registers and register usage}
 
 \begin{table}[h]
-\begin{tabular}{3 B}
+\begin{tabular*}{0.75\textwidth}{3 B}
 \hline
 Name          & Brief description\\
 \hline
@@ -286,7 +286,7 @@
 {\bf st0}     & scratch, floating point return value\\
 {\bf st1-st7} & scratch\\
 \hline
-\end{tabular}
+\end{tabular*}
 \caption{Register usage on x86 fastcall (Borland) calling convention}
 \end{table}
 
@@ -347,7 +347,7 @@
 \paragraph{Registers and register usage}
 
 \begin{table}[h]
-\begin{tabular}{3 B}
+\begin{tabular*}{0.75\textwidth}{3 B}
 \hline
 Name          & Brief description\\
 \hline
@@ -362,7 +362,7 @@
 {\bf st0}     & scratch, floating point return value\\
 {\bf st1-st7} & scratch\\
 \hline
-\end{tabular}
+\end{tabular*}
 \caption{Register usage on x86 fastcall (Watcom) calling convention}
 \end{table}
 
@@ -420,7 +420,7 @@
 \paragraph{Registers and register usage}
 
 \begin{table}[h]
-\begin{tabular}{3 B}
+\begin{tabular*}{0.75\textwidth}{3 B}
 \hline
 Name          & Brief description\\
 \hline
@@ -435,7 +435,7 @@
 {\bf st0}     & scratch, floating point return value\\
 {\bf st1-st7} & scratch\\
 \hline
-\end{tabular}
+\end{tabular*}
 \caption{Register usage on x86 stdcall calling convention}
 \end{table}
 
@@ -491,7 +491,7 @@
 \paragraph{Registers and register usage}
 
 \begin{table}[h]
-\begin{tabular}{3 B}
+\begin{tabular*}{0.75\textwidth}{3 B}
 \hline
 Name          & Brief description\\
 \hline
@@ -506,7 +506,7 @@
 {\bf st0}     & scratch, floating point return value\\
 {\bf st1-st7} & scratch\\
 \hline
-\end{tabular}
+\end{tabular*}
 \caption{Register usage on x86 thiscall (MS) calling convention}
 \end{table}
 
@@ -567,7 +567,7 @@
 \paragraph{Registers and register usage}
 
 \begin{table}[h]
-\begin{tabular}{3 B}
+\begin{tabular*}{0.75\textwidth}{3 B}
 \hline
 Name          & Brief description\\
 \hline
@@ -582,7 +582,7 @@
 {\bf st0}     & scratch, floating point return value\\
 {\bf st1-st7} & scratch\\
 \hline
-\end{tabular}
+\end{tabular*}
 \caption{Register usage on x86 thiscall (GNU) calling convention}
 \end{table}
 
@@ -640,7 +640,7 @@
 \paragraph{Registers and register usage}
 
 \begin{table}[h]
-\begin{tabular}{3 B}
+\begin{tabular*}{0.75\textwidth}{3 B}
 \hline
 Name          & Brief description\\
 \hline
@@ -655,7 +655,7 @@
 {\bf st0}     & scratch, floating point return value\\
 {\bf st1-st7} & scratch\\
 \hline
-\end{tabular}
+\end{tabular*}
 \caption{Register usage on x86 pascal calling convention}
 \end{table}
 
@@ -712,7 +712,7 @@
 \paragraph{Registers and register usage}
 
 \begin{table}[h]
-\begin{tabular}{3 B}
+\begin{tabular*}{0.75\textwidth}{3 B}
 \hline
 Name          & Brief description\\
 \hline
@@ -727,7 +727,7 @@
 {\bf st0}     & scratch, floating point return value\\
 {\bf st1-st7} & scratch\\
 \hline
-\end{tabular}
+\end{tabular*}
 \caption{Register usage on x86 plan9call calling convention}
 \end{table}