From a38173156af1cd51f622f4cd21ec936999c8691c Mon Sep 17 00:00:00 2001
From: "Michael J. Spencer" <bigcheesegs@gmail.com>
Date: Sun, 10 Oct 2010 22:04:34 +0000
Subject: X86: Call _alldiv instead of __divdi3 on Windows (excluding cygwin).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@116174 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/X86/X86ISelLowering.cpp  |  6 ++++++
 test/CodeGen/X86/alldiv-divdi3.ll   | 16 ++++++++++++++++
 test/CodeGen/X86/legalizedag_vec.ll |  8 +++++---
 3 files changed, 27 insertions(+), 3 deletions(-)
 create mode 100644 test/CodeGen/X86/alldiv-divdi3.ll

diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp
index 89ae4e8..74fe647 100644
--- a/lib/Target/X86/X86ISelLowering.cpp
+++ b/lib/Target/X86/X86ISelLowering.cpp
@@ -96,6 +96,12 @@ X86TargetLowering::X86TargetLowering(X86TargetMachine &TM)
   setSchedulingPreference(Sched::RegPressure);
   setStackPointerRegisterToSaveRestore(X86StackPtr);
 
+  if (Subtarget->isTargetWindows() && !Subtarget->isTargetCygwin()) {
+    // Setup Windows compiler runtime calls.
+    setLibcallName(RTLIB::SDIV_I64, "_alldiv");
+    setLibcallCallingConv(RTLIB::SDIV_I64, CallingConv::X86_StdCall);
+  }
+
   if (Subtarget->isTargetDarwin()) {
     // Darwin should use _setjmp/_longjmp instead of setjmp/longjmp.
     setUseUnderscoreSetJmp(false);
diff --git a/test/CodeGen/X86/alldiv-divdi3.ll b/test/CodeGen/X86/alldiv-divdi3.ll
new file mode 100644
index 0000000..250d7d8
--- /dev/null
+++ b/test/CodeGen/X86/alldiv-divdi3.ll
@@ -0,0 +1,16 @@
+; Test that, for a 64 bit signed div, a libcall to alldiv is made on Windows
+; except for cygwin.
+
+; RUN: llc < %s -mtriple i386-pc-win32 | FileCheck %s
+; RUN: llc < %s -mtriple i386-pc-cygwin | FileCheck %s -check-prefix CYGWIN
+
+define i32 @main(i32 %argc, i8** nocapture %argv) nounwind readonly {
+entry:
+  %conv4 = sext i32 %argc to i64
+  %div = sdiv i64 84, %conv4
+  %conv7 = trunc i64 %div to i32
+  ret i32 %conv7
+}
+
+; CHECK: alldiv
+; CYGWIN: divdi3
diff --git a/test/CodeGen/X86/legalizedag_vec.ll b/test/CodeGen/X86/legalizedag_vec.ll
index 574b46a..028627d 100644
--- a/test/CodeGen/X86/legalizedag_vec.ll
+++ b/test/CodeGen/X86/legalizedag_vec.ll
@@ -1,5 +1,4 @@
-; RUN: llc < %s -march=x86 -mattr=sse2 -disable-mmx -o %t
-; RUN: grep {call.*divdi3}  %t | count 2
+; RUN: llc < %s -march=x86 -mattr=sse2 -disable-mmx | FileCheck %s
 
 
 ; Test case for r63760 where we generate a legalization assert that an illegal
@@ -12,4 +11,7 @@
 define <2 x i64> @test_long_div(<2 x i64> %num, <2 x i64> %div) {
   %div.r = sdiv <2 x i64> %num, %div
   ret <2 x i64>  %div.r
-}                                     
+}
+
+; CHECK: call{{.*(divdi3|alldiv)}}
+; CHECK: call{{.*(divdi3|alldiv)}}
-- 
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