This is the mail archive of the
gcc-patches@gcc.gnu.org
mailing list for the GCC project.
Fix win64 abi wrt AVX registers
- From: Richard Henderson <rth at redhat dot com>
- To: GCC Patches <gcc-patches at gcc dot gnu dot org>
- Cc: ktietz70 at googlemail dot com
- Date: Wed, 11 Aug 2010 11:44:58 -0700
- Subject: Fix win64 abi wrt AVX registers
As detailed in the comment, verified by ktietz via contacts
at Microsoft.
Sanity checked on x86_64-linux and committed.
r~
* config/i386/i386.h (HARD_REGNO_CALL_PART_CLOBBERED): New.
diff --git a/gcc/config/i386/i386.h b/gcc/config/i386/i386.h
index a2acc71..7fd874b 100644
--- a/gcc/config/i386/i386.h
+++ b/gcc/config/i386/i386.h
@@ -1104,6 +1104,12 @@ enum target_cpu_default
: (MODE) == QImode && (REGNO) > BX_REG && !TARGET_64BIT ? SImode \
: (MODE))
+/* The only ABI that saves SSE registers across calls is Win64 (thus no
+ need to check the current ABI here), and with AVX enabled Win64 only
+ guarantees that the low 16 bytes are saved. */
+#define HARD_REGNO_CALL_PART_CLOBBERED(REGNO, MODE) \
+ (SSE_REGNO_P (REGNO) && GET_MODE_SIZE (MODE) > 16)
+
/* Specify the registers used for certain standard purposes.
The values of these macros are register numbers. */