From: Thomas Pornin <pornin@bolet.org>
Date: Mon, 17 Apr 2017 13:36:06 +0000 (+0000)
Subject: Workaround for compiler bug (GCC 4.8 and 4.9 when targetting 32-bit x86).
X-Git-Tag: v0.5~19
X-Git-Url: https://bearssl.org/gitweb//home/git/?p=BearSSL;a=commitdiff_plain;h=d021b7eb7fada2acbe16b1b56f6e2cbdf8eee362;ds=inline

Workaround for compiler bug (GCC 4.8 and 4.9 when targetting 32-bit x86).
---

diff --git a/src/hash/ghash_pclmul.c b/src/hash/ghash_pclmul.c
index 7ec9823..7c8f2fa 100644
--- a/src/hash/ghash_pclmul.c
+++ b/src/hash/ghash_pclmul.c
@@ -35,13 +35,11 @@
 #if BR_AES_X86NI_GCC_OLD
 #pragma GCC push_options
 #pragma GCC target("sse2,ssse3,pclmul")
+#pragma GCC diagnostic ignored "-Wpsabi"
 #endif
 #include <tmmintrin.h>
 #include <wmmintrin.h>
 #include <cpuid.h>
-#if BR_AES_X86NI_GCC_OLD
-#pragma GCC pop_options
-#endif
 #endif
 
 #if BR_AES_X86NI_MSC
@@ -349,6 +347,10 @@ br_ghash_pclmul_get(void)
 	return pclmul_supported() ? &br_ghash_pclmul : 0;
 }
 
+#if BR_AES_X86NI_GCC && BR_AES_X86NI_GCC_OLD
+#pragma GCC pop_options
+#endif
+
 #else
 
 /* see bearssl_hash.h */
diff --git a/src/inner.h b/src/inner.h
index 3cafa42..3830c7c 100644
--- a/src/inner.h
+++ b/src/inner.h
@@ -157,10 +157,12 @@
  * GCC versions from 4.4 to 4.8 (inclusive) must use a special #pragma
  * to activate extra opcodes before including the relevant intrinsic
  * headers. But these don't work with Clang (which does not need them
- * either).
+ * either). We also need that #pragma for GCC 4.9 in order to work
+ * around a compiler bug (it tends to blow up on ghash_pclmul code
+ * otherwise).
  */
 #if BR_AES_X86NI_GCC && !defined BR_AES_X86NI_GCC_OLD
-#if __GNUC__ == 4 && __GNUC_MINOR__ >= 4 && __GNUC_MINOR__ <= 8 && !__clang__
+#if __GNUC__ == 4 && __GNUC_MINOR__ >= 4 && __GNUC_MINOR__ <= 9 && !__clang__
 #define BR_AES_X86NI_GCC_OLD   1
 #endif
 #endif