[PATCH][gdb/testsuite] Fix gdb.reverse/insn-reverse-x86.c for -m32

[Tom de Vries <tdevries@suse.de>]

Hi,

When running test-case gdb.reverse/insn-reverse.exp with target board
unix/-m32, we get:
...
spawn -ignore SIGHUP gcc -fno-stack-protector -fdiagnostics-color=never \
  -c -g -m32 -o insn-reverse0.o insn-reverse.c^M
insn-reverse-x86.c: Assembler messages:^M
insn-reverse-x86.c:88: Error: bad register name `%r8w'^M
....

Fix this by guarding x86_64 assembly in insn-reverse-x86.c with #ifdef
__x86_64__.

Tested on x86_64-linux, with native and unix/-m32.

Any comments?

Thanks,
- Tom

[gdb/testsuite] Fix gdb.reverse/insn-reverse-x86.c for -m32

gdb/testsuite/ChangeLog:

2020-11-25  Tom de Vries  <tdevries@suse.de>

	* gdb.reverse/insn-reverse-x86.c: Guard x86_64 assembly with #ifdef
	__x86_64__.

---
 gdb/testsuite/gdb.reverse/insn-reverse-x86.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/gdb/testsuite/gdb.reverse/insn-reverse-x86.c b/gdb/testsuite/gdb.reverse/insn-reverse-x86.c
index 22ba97a50d7..4392cb66def 100644
--- a/gdb/testsuite/gdb.reverse/insn-reverse-x86.c
+++ b/gdb/testsuite/gdb.reverse/insn-reverse-x86.c
@@ -85,6 +85,7 @@ rdrand (void)
   __asm__ volatile ("rdrand %%sp;" : "=r" (number));
   __asm__ volatile ("mov %%ax, %%sp;" : "=r" (number));
 
+#ifdef __x86_64__
   __asm__ volatile ("rdrand %%r8w;" : "=r" (number));
   __asm__ volatile ("rdrand %%r9w;" : "=r" (number));
   __asm__ volatile ("rdrand %%r10w;" : "=r" (number));
@@ -93,6 +94,7 @@ rdrand (void)
   __asm__ volatile ("rdrand %%r13w;" : "=r" (number));
   __asm__ volatile ("rdrand %%r14w;" : "=r" (number));
   __asm__ volatile ("rdrand %%r15w;" : "=r" (number));
+#endif
 
   /* 32-bit random numbers.  */
   __asm__ volatile ("rdrand %%eax;" : "=r" (number));
@@ -100,6 +102,7 @@ rdrand (void)
   __asm__ volatile ("rdrand %%ecx;" : "=r" (number));
   __asm__ volatile ("rdrand %%edx;" : "=r" (number));
 
+#ifdef __x86_64__
   __asm__ volatile ("mov %%rdi, %%rax;" : "=r" (number));
   __asm__ volatile ("rdrand %%edi;" : "=r" (number));
   __asm__ volatile ("mov %%rax, %%rdi;" : "=r" (number));
@@ -155,6 +158,7 @@ rdrand (void)
   __asm__ volatile ("rdrand %%r13;" : "=r" (number));
   __asm__ volatile ("rdrand %%r14;" : "=r" (number));
   __asm__ volatile ("rdrand %%r15;" : "=r" (number));
+#endif
 }
 
 /* Test rdseed support for various output registers.  */
@@ -190,6 +194,7 @@ rdseed (void)
   __asm__ volatile ("rdseed %%sp;" : "=r" (seed));
   __asm__ volatile ("mov %%ax, %%sp;" : "=r" (seed));
 
+#ifdef __x86_64__
   __asm__ volatile ("rdseed %%r8w;" : "=r" (seed));
   __asm__ volatile ("rdseed %%r9w;" : "=r" (seed));
   __asm__ volatile ("rdseed %%r10w;" : "=r" (seed));
@@ -198,6 +203,7 @@ rdseed (void)
   __asm__ volatile ("rdseed %%r13w;" : "=r" (seed));
   __asm__ volatile ("rdseed %%r14w;" : "=r" (seed));
   __asm__ volatile ("rdseed %%r15w;" : "=r" (seed));
+#endif
 
   /* 32-bit random seeds.  */
   __asm__ volatile ("rdseed %%eax;" : "=r" (seed));
@@ -205,6 +211,7 @@ rdseed (void)
   __asm__ volatile ("rdseed %%ecx;" : "=r" (seed));
   __asm__ volatile ("rdseed %%edx;" : "=r" (seed));
 
+#ifdef __x86_64__
   __asm__ volatile ("mov %%rdi, %%rax;" : "=r" (seed));
   __asm__ volatile ("rdseed %%edi;" : "=r" (seed));
   __asm__ volatile ("mov %%rax, %%rdi;" : "=r" (seed));
@@ -260,6 +267,7 @@ rdseed (void)
   __asm__ volatile ("rdseed %%r13;" : "=r" (seed));
   __asm__ volatile ("rdseed %%r14;" : "=r" (seed));
   __asm__ volatile ("rdseed %%r15;" : "=r" (seed));
+#endif
 }
 
 /* Initialize arch-specific bits.  */