This is the mail archive of the
gcc-patches@gcc.gnu.org
mailing list for the GCC project.
[x32] PATCH: Don't generate byte 0x66 in TLS GD for TARGET_X32
- From: "H.J. Lu" <hongjiu dot lu at intel dot com>
- To: gcc-patches at gcc dot gnu dot org
- Date: Sat, 12 Mar 2011 07:45:36 -0800
- Subject: [x32] PATCH: Don't generate byte 0x66 in TLS GD for TARGET_X32
- Reply-to: "H.J. Lu" <hjl dot tools at gmail dot com>
Hi,
For x32, pointers are 32bit. It uses
movl %fs:0, %eax
instead of
movq %fs:0, %rax
to load TCB pointer. I checked in this patch to avoid byte 0x66 in TLS
GD for TARGET_X32.
H.J.
---
>From 8c92f0d4860fd2693af864d87804aaee843f2680 Mon Sep 17 00:00:00 2001
From: H.J. Lu <hjl.tools@gmail.com>
Date: Sat, 12 Mar 2011 05:53:03 -0800
Subject: [PATCH 5/5] Don't generate byte 0x66 in TLS GD for TARGET_X32.
---
gcc/ChangeLog.x32 | 5 +++++
gcc/config/i386/i386.md | 10 ++++++++--
2 files changed, 13 insertions(+), 2 deletions(-)
diff --git a/gcc/ChangeLog.x32 b/gcc/ChangeLog.x32
index 5ecea15..b85956c 100644
--- a/gcc/ChangeLog.x32
+++ b/gcc/ChangeLog.x32
@@ -1,3 +1,8 @@
+2011-03-12 H.J. Lu <hongjiu.lu@intel.com>
+
+ * config/i386/i386.md (*tls_global_dynamic_64): Don't generate
+ byte 0x66 before lea for TARGET_X32.
+
2011-03-11 H.J. Lu <hongjiu.lu@intel.com>
PR target/48084
diff --git a/gcc/config/i386/i386.md b/gcc/config/i386/i386.md
index 8208491..89c0455 100644
--- a/gcc/config/i386/i386.md
+++ b/gcc/config/i386/i386.md
@@ -12595,9 +12595,15 @@
(unspec:DI [(match_operand 1 "tls_symbolic_operand" "")]
UNSPEC_TLS_GD)]
"TARGET_64BIT"
- { return ASM_BYTE "0x66\n\tlea{q}\t{%a1@tlsgd(%%rip), %%rdi|rdi, %a1@tlsgd[rip]}\n" ASM_SHORT "0x6666\n\trex64\n\tcall\t%P2"; }
+{
+ if (TARGET_X32)
+ return "lea{q}\t{%a1@tlsgd(%%rip), %%rdi|rdi, %a1@tlsgd[rip]}\n" ASM_SHORT "0x6666\n\trex64\n\tcall\t%P2";
+ else
+ return ASM_BYTE "0x66\n\tlea{q}\t{%a1@tlsgd(%%rip), %%rdi|rdi, %a1@tlsgd[rip]}\n" ASM_SHORT "0x6666\n\trex64\n\tcall\t%P2";
+}
[(set_attr "type" "multi")
- (set_attr "length" "16")])
+ (set (attr "length")
+ (symbol_ref "TARGET_X32 ? 15 : 16"))])
(define_expand "tls_global_dynamic_64"
[(parallel [(set (match_operand:DI 0 "register_operand" "")
--
1.7.4