Eric Lee / linux-smarc-t335x-v3.2

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Commit 1a20d3ecf5c2a6435df2b756435b1eb1c657d45b

Authored by H. Peter Anvin
1 parent 4b6011bc6e
Exists in master and in 4 other branches v3.2_AM335xPSP_04.06.00.11, v3.2_NEWT335xPSP_04.06.00.11, v3.2_SBC_SMARTMEN, v3.2_SMARCT335xPSP_04.06.00.11

x86: string_32.h: workaround for broken gcc 4.0 

gcc 4.0 fails to allocate %eax for the pattern operand in the rep
store instructions used by memset; force it to do so by declaring a
register variable.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>

Showing 1 changed file with 8 additions and 1 deletions Side-by-side Diff

include/asm-x86/string_32.h
Diff comments   View file @ 1a20d3e
... ... @@ -267,11 +267,18 @@
267 267 asm volatile("rep ; stosl" \
268 268 x \
269 269 : "=&c" (d0), "=&D" (d1) \
270   - : "a" (pattern), "0" (count/4), "1" ((long)s) \
  270 + : "a" (eax), "0" (count/4), "1" ((long)s) \
271 271 : "memory")
272 272  
273 273 {
274 274 int d0, d1;
  275 +#if __GNUC__ == 4 && __GNUC_MINOR__ == 0
  276 + /* Workaround for broken gcc 4.0 */
  277 + register unsigned long eax asm("%eax") = pattern;
  278 +#else
  279 + unsigned long eax = pattern;
  280 +#endif
  281 +
275 282 switch (count % 4) {
276 283 case 0:
277 284 COMMON("");