From: Nico Weber <nicolasweber@gmx.de>
Date: Fri, 20 Jul 2018 21:02:09 +0000 (+0000)
Subject: [ms] Add __shiftleft128 / __shiftright128 intrinsics
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=c74a596b1d364a9ecf0d274fbdfd46e998cc59f7;p=clang

[ms] Add __shiftleft128 / __shiftright128 intrinsics

Carefully match the pattern matched by ISel so that this produces shld / shrd
(unless Subtarget->isSHLDSlow() is true).

Thanks to Craig Topper for providing the LLVM IR pattern that gets successfully
matched.

Fixes PR37755.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@337619 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Headers/intrin.h b/lib/Headers/intrin.h
index edb947eef6..91914214e2 100644
--- a/lib/Headers/intrin.h
+++ b/lib/Headers/intrin.h
@@ -863,6 +863,20 @@ __nop(void) {
   __asm__ volatile ("nop");
 }
 #endif
+#if defined(__x86_64__)
+static __inline__ unsigned __int64 __DEFAULT_FN_ATTRS
+__shiftleft128(unsigned __int64 __l, unsigned __int64 __h, unsigned char __d) {
+  unsigned __int128 __val = ((unsigned __int128)__h << 64) | __l;
+  unsigned __int128 __res = __val << (__d & 63);
+  return (unsigned __int64)(__res >> 64);
+}
+static __inline__ unsigned __int64 __DEFAULT_FN_ATTRS
+__shiftright128(unsigned __int64 __l, unsigned __int64 __h, unsigned char __d) {
+  unsigned __int128 __val = ((unsigned __int128)__h << 64) | __l;
+  unsigned __int128 __res = __val >> (__d & 63);
+  return (unsigned __int64)__res;
+}
+#endif
 
 /*----------------------------------------------------------------------------*\
 |* Privileged intrinsics
diff --git a/test/Headers/ms-intrin.cpp b/test/Headers/ms-intrin.cpp
index b0fef9cc06..d8a4d382eb 100644
--- a/test/Headers/ms-intrin.cpp
+++ b/test/Headers/ms-intrin.cpp
@@ -42,6 +42,8 @@ void f() {
   __stosw(0, 0, 0);
 
 #ifdef _M_X64
+  __shiftleft128(1, 2, 3);
+  __shiftright128(1, 2, 3);
   __movsq(0, 0, 0);
   __stosq(0, 0, 0);
 #endif