diff -uarN fftw-3.0.1.old/dft/k7/k7.c fftw-3.0.1/dft/k7/k7.c
--- fftw-3.0.1.old/dft/k7/k7.c	2007-04-18 10:05:40.000000000 +0400
+++ fftw-3.0.1/dft/k7/k7.c	2007-04-18 10:08:57.000000000 +0400
@@ -28,7 +28,7 @@
 {
      int eax, ecx, edx;
 
-     __asm__("push %%ebx\n\tcpuid\n\tpop %%ebx"
+     __asm__("push %%rbx\n\tcpuid\n\tpop %%rbx"
 	     : "=a" (eax), "=c" (ecx), "=d" (edx)
 	     : "a" (op));
      return edx;
@@ -38,7 +38,7 @@
 {
      int eax, ecx, edx;
 
-     __asm__("push %%ebx\n\tcpuid\n\tpop %%ebx"
+     __asm__("push %%rbx\n\tcpuid\n\tpop %%rbx"
 	     : "=a" (eax), "=c" (ecx), "=d" (edx)
 	     : "a" (op));
      return eax;
diff -uarN fftw-3.0.1.old/simd/3dnow.c fftw-3.0.1/simd/3dnow.c
--- fftw-3.0.1.old/simd/3dnow.c	2007-04-18 10:05:41.000000000 +0400
+++ fftw-3.0.1/simd/3dnow.c	2007-04-18 10:08:31.000000000 +0400
@@ -29,7 +29,7 @@
 {
      int eax, ecx, edx;
 
-     __asm__("push %%ebx\n\tcpuid\n\tpop %%ebx"
+     __asm__("push %%rbx\n\tcpuid\n\tpop %%rbx"
 	     : "=a" (eax), "=c" (ecx), "=d" (edx)
 	     : "a" (op));
      return edx;
@@ -39,7 +39,7 @@
 {
      int eax, ecx, edx;
 
-     __asm__("push %%ebx\n\tcpuid\n\tpop %%ebx"
+     __asm__("push %%rbx\n\tcpuid\n\tpop %%rbx"
 	     : "=a" (eax), "=c" (ecx), "=d" (edx)
 	     : "a" (op));
      return eax;
diff -uarN fftw-3.0.1.old/simd/sse2.c fftw-3.0.1/simd/sse2.c
--- fftw-3.0.1.old/simd/sse2.c	2007-04-18 10:05:41.000000000 +0400
+++ fftw-3.0.1/simd/sse2.c	2007-04-18 10:08:14.000000000 +0400
@@ -43,7 +43,7 @@
 #else
      int eax, ecx, edx;
 
-     __asm__("push %%ebx\n\tcpuid\n\tpop %%ebx"
+     __asm__("push %%rbx\n\tcpuid\n\tpop %%rbx"
 	     : "=a" (eax), "=c" (ecx), "=d" (edx)
 	     : "a" (op));
      return edx;
diff -uarN fftw-3.0.1.old/simd/sse.c fftw-3.0.1/simd/sse.c
--- fftw-3.0.1.old/simd/sse.c	2007-04-18 10:05:41.000000000 +0400
+++ fftw-3.0.1/simd/sse.c	2007-04-18 10:08:04.000000000 +0400
@@ -43,7 +43,7 @@
 #else
      int eax, ecx, edx;
 
-     __asm__("push %%ebx\n\tcpuid\n\tpop %%ebx"
+     __asm__("push %%rbx\n\tcpuid\n\tpop %%rbx"
 	     : "=a" (eax), "=c" (ecx), "=d" (edx)
 	     : "a" (op));
      return edx;