PATCH: PR libc/10162: Use a simple loop on data shorter than software pipeline

[H.J. Lu]

On Mon, Nov 09, 2009 at 11:57:06AM -0800, H.J. Lu wrote:
> When data is shorter than software pipeline, recovery may fail. This
> patch avoids it by using a simple loop on data shorter than software
> pipeline.
> 

Here is an updated patch. This one properly handles the shorter read
on speculative load.


H.J.
---
2009-11-09  H.J. Lu  <hongjiu.lu@intel.com>

	PR libc/10162
	* sysdeps/ia64/memchr.S: Properly recover from shorter read.

diff --git a/sysdeps/ia64/memchr.S b/sysdeps/ia64/memchr.S
index cd062b2..cdd71ca 100644
--- a/sysdeps/ia64/memchr.S
+++ b/sysdeps/ia64/memchr.S
@@ -126,7 +126,16 @@ ENTRY(__memchr)
 	br.ret.sptk.many b0
 
 .recovery:
-	adds	ret0 = -((MEMLAT + 1) * 8), ret0;;
+#if MEMLAT != 6
+# error "MEMLAT must be 6!"
+#endif
+(p[MEMLAT-6])	add	ret0 = -8, ret0;;
+(p[MEMLAT-5])	add	ret0 = -8, ret0;;
+(p[MEMLAT-4])	add	ret0 = -8, ret0;;
+(p[MEMLAT-3])	add	ret0 = -8, ret0;;
+(p[MEMLAT-2])	add	ret0 = -8, ret0;;
+(p[MEMLAT-1])	add	ret0 = -8, ret0;;
+(p[MEMLAT])	add	ret0 = -8, ret0;;
 (p[MEMLAT+1])	add	ret0 = -8, ret0;;
 (p[MEMLAT+2])	add	ret0 = -8, ret0;;
 .l4: