# Re: 4 hashes parallel on SSE2 CPUs for 0.3.6

Post by: satoshi on August 15, 2010, 03:40:29 AM

On both MinGW GCC 4.4.1 and 4.5.0 I have it working with test.cpp but SIGSEGV when called by BitcoinMiner.  So now it doesn't look like it's the version of GCC, it's something else, maybe just the luck of how the stack is aligned.

I have it working fine on GCC 4.3.3 on Ubuntu 32-bit.

I found the problem with Crypto++ on MinGW 4.5.0.  Here's the patch for that:

Code:

```
--- \old\sha.cpp	Mon Jul 26 13:31:11 2010
+++ \new\sha.cpp	Sat Aug 14 20:21:08 2010
@@ -336,7 +336,7 @@
 	ROUND(14, 0, eax, ecx, edi, edx)
 	ROUND(15, 0, ecx, eax, edx, edi)

-	ASL(1)
+    ASL(label1)   // Bitcoin: fix for MinGW GCC 4.5
 	AS2(add WORD_REG(si), 4*16)
 	ROUND(0, 1, eax, ecx, edi, edx)
 	ROUND(1, 1, ecx, eax, edx, edi)
@@ -355,7 +355,7 @@
 	ROUND(14, 1, eax, ecx, edi, edx)
 	ROUND(15, 1, ecx, eax, edx, edi)
 	AS2(	cmp		WORD_REG(si), K_END)
-	ASJ(	jne,	1, b)
+    ASJ(    jne,    label1,  )   // Bitcoin: fix for MinGW GCC 4.5

 	AS2(	mov		WORD_REG(dx), DATA_SAVE)
 	AS2(	add		WORD_REG(dx), 64)
```

---

Source file: bitcoin-forum-satoshi-nakamoto.tgz

External link: https://bitcointalk.org/index.php?topic=648.msg9359#msg9359