From ed967f37520fec398aa419514de552e1a917c9ec Mon Sep 17 00:00:00 2001
From: Manman Ren <manman.ren@gmail.com>
Date: Tue, 12 Jan 2016 01:08:46 +0000
Subject: CXX_FAST_TLS calling convention: performance improvement for x86-64.

This is the same change on x86-64 as r255821 on AArch64.
rdar://9001553

llvm-svn: 257428
---
 llvm/test/CodeGen/X86/cxx_tlscc64.ll | 61 +++++++++++-------------------------
 1 file changed, 19 insertions(+), 42 deletions(-)

(limited to 'llvm/test/CodeGen/X86/cxx_tlscc64.ll')

diff --git a/llvm/test/CodeGen/X86/cxx_tlscc64.ll b/llvm/test/CodeGen/X86/cxx_tlscc64.ll
index 16e678a9222..70fe501040b 100644
--- a/llvm/test/CodeGen/X86/cxx_tlscc64.ll
+++ b/llvm/test/CodeGen/X86/cxx_tlscc64.ll
@@ -2,8 +2,8 @@
 ; TLS function were wrongly model and after fixing that, shrink-wrapping
 ; cannot help here. To achieve the expected lowering, we need to playing
 ; tricks similar to AArch64 fast TLS calling convention (r255821).
-; Re-enable the following run line when 
-; _RUN_: llc < %s -mtriple=x86_64-apple-darwin -enable-shrink-wrap=true | FileCheck --check-prefix=SHRINK %s
+; Applying tricks on x86-64 similar to r255821.
+; RUN: llc < %s -mtriple=x86_64-apple-darwin -enable-shrink-wrap=true | FileCheck %s
 %struct.S = type { i8 }
 
 @sg = internal thread_local global %struct.S zeroinitializer, align 1
@@ -16,51 +16,28 @@ declare i32 @_tlv_atexit(void (i8*)*, i8*, i8*)
 
 ; Every GPR should be saved - except rdi, rax, and rsp
 ; CHECK-LABEL: _ZTW2sg
-; CHECK: pushq %r11
-; CHECK: pushq %r10
-; CHECK: pushq %r9
-; CHECK: pushq %r8
-; CHECK: pushq %rsi
-; CHECK: pushq %rdx
-; CHECK: pushq %rcx
-; CHECK: pushq %rbx
+; CHECK-NOT: pushq %r11
+; CHECK-NOT: pushq %r10
+; CHECK-NOT: pushq %r9
+; CHECK-NOT: pushq %r8
+; CHECK-NOT: pushq %rsi
+; CHECK-NOT: pushq %rdx
+; CHECK-NOT: pushq %rcx
+; CHECK-NOT: pushq %rbx
 ; CHECK: callq
 ; CHECK: jne
 ; CHECK: callq
 ; CHECK: tlv_atexit
 ; CHECK: callq
-; CHECK: popq %rbx
-; CHECK: popq %rcx
-; CHECK: popq %rdx
-; CHECK: popq %rsi
-; CHECK: popq %r8
-; CHECK: popq %r9
-; CHECK: popq %r10
-; CHECK: popq %r11
-; SHRINK-LABEL: _ZTW2sg
-; SHRINK: callq
-; SHRINK: jne
-; SHRINK: pushq %r11
-; SHRINK: pushq %r10
-; SHRINK: pushq %r9
-; SHRINK: pushq %r8
-; SHRINK: pushq %rsi
-; SHRINK: pushq %rdx
-; SHRINK: pushq %rcx
-; SHRINK: pushq %rbx
-; SHRINK: callq
-; SHRINK: tlv_atexit
-; SHRINK: popq %rbx
-; SHRINK: popq %rcx
-; SHRINK: popq %rdx
-; SHRINK: popq %rsi
-; SHRINK: popq %r8
-; SHRINK: popq %r9
-; SHRINK: popq %r10
-; SHRINK: popq %r11
-; SHRINK: LBB{{.*}}:
-; SHRINK: callq
-define cxx_fast_tlscc nonnull %struct.S* @_ZTW2sg() {
+; CHECK-NOT: popq %rbx
+; CHECK-NOT: popq %rcx
+; CHECK-NOT: popq %rdx
+; CHECK-NOT: popq %rsi
+; CHECK-NOT: popq %r8
+; CHECK-NOT: popq %r9
+; CHECK-NOT: popq %r10
+; CHECK-NOT: popq %r11
+define cxx_fast_tlscc nonnull %struct.S* @_ZTW2sg() nounwind {
   %.b.i = load i1, i1* @__tls_guard, align 1
   br i1 %.b.i, label %__tls_init.exit, label %init.i
 
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