RuntimeLibcalls: Fix calling conv of win32 div libcalls

There's probably an existing test this should be added to,
but our test coverage is really bad that this wasn't caught
by one.

Author: arsenm

llvm/include/llvm/IR/RuntimeLibcalls.td

@@ -2129,7 +2129,7 @@ defvar X86CommonLibcalls =
 );
 
 defvar Windows32DivRemMulCalls =
-  LibcallImpls<(add WindowsDivRemMulLibcalls),
+  LibcallsWithCC<(add WindowsDivRemMulLibcalls), X86_STDCALL,
   RuntimeLibcallPredicate<"TT.isWindowsMSVCEnvironment() || TT.isWindowsItaniumEnvironment()">>;
 
 def X86_32SystemLibrary

llvm/test/CodeGen/X86/win32-int-runtime-libcalls.ll

@@ -0,0 +1,72 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 5
+; RUN: llc -mtriple=i686-windows-msvc < %s | FileCheck %s
+
+define i64 @test_sdiv_i64(i64 %a, i64 %b) {
+; CHECK-LABEL: test_sdiv_i64:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    pushl {{[0-9]+}}(%esp)
+; CHECK-NEXT:    pushl {{[0-9]+}}(%esp)
+; CHECK-NEXT:    pushl {{[0-9]+}}(%esp)
+; CHECK-NEXT:    pushl {{[0-9]+}}(%esp)
+; CHECK-NEXT:    calll __alldiv
+; CHECK-NEXT:    retl
+  %ret = sdiv i64 %a, %b
+  ret i64 %ret
+}
+
+define i64 @test_srem_i64(i64 %a, i64 %b) {
+; CHECK-LABEL: test_srem_i64:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    pushl {{[0-9]+}}(%esp)
+; CHECK-NEXT:    pushl {{[0-9]+}}(%esp)
+; CHECK-NEXT:    pushl {{[0-9]+}}(%esp)
+; CHECK-NEXT:    pushl {{[0-9]+}}(%esp)
+; CHECK-NEXT:    calll __allrem
+; CHECK-NEXT:    retl
+  %ret = srem i64 %a, %b
+  ret i64 %ret
+}
+
+define i64 @test_udiv_i64(i64 %a, i64 %b) {
+; CHECK-LABEL: test_udiv_i64:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    pushl {{[0-9]+}}(%esp)
+; CHECK-NEXT:    pushl {{[0-9]+}}(%esp)
+; CHECK-NEXT:    pushl {{[0-9]+}}(%esp)
+; CHECK-NEXT:    pushl {{[0-9]+}}(%esp)
+; CHECK-NEXT:    calll __aulldiv
+; CHECK-NEXT:    retl
+  %ret = udiv i64 %a, %b
+  ret i64 %ret
+}
+
+define i64 @test_urem_i64(i64 %a, i64 %b) {
+; CHECK-LABEL: test_urem_i64:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    pushl {{[0-9]+}}(%esp)
+; CHECK-NEXT:    pushl {{[0-9]+}}(%esp)
+; CHECK-NEXT:    pushl {{[0-9]+}}(%esp)
+; CHECK-NEXT:    pushl {{[0-9]+}}(%esp)
+; CHECK-NEXT:    calll __aullrem
+; CHECK-NEXT:    retl
+  %ret = urem i64 %a, %b
+  ret i64 %ret
+}
+
+define i64 @test_mul_i64(i64 %a, i64 %b) {
+; CHECK-LABEL: test_mul_i64:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    pushl %esi
+; CHECK-NEXT:    movl {{[0-9]+}}(%esp), %ecx
+; CHECK-NEXT:    movl {{[0-9]+}}(%esp), %esi
+; CHECK-NEXT:    movl %ecx, %eax
+; CHECK-NEXT:    mull %esi
+; CHECK-NEXT:    imull {{[0-9]+}}(%esp), %ecx
+; CHECK-NEXT:    addl %ecx, %edx
+; CHECK-NEXT:    imull {{[0-9]+}}(%esp), %esi
+; CHECK-NEXT:    addl %esi, %edx
+; CHECK-NEXT:    popl %esi
+; CHECK-NEXT:    retl
+  %ret = mul i64 %a, %b
+  ret i64 %ret
+}