thakis created this revision.
thakis added a reviewer: craig.topper.
cl.exe maps these to shld / shrd, so let's do the same. ISel has
`Subtarget->isSHLDSlow()` to prevent use of these intrinsics on some machines,
but honoring them feels a bit like trying to outsmart the intrinsics user, and
there's n good way to get at that bit from here anyways.
Fixes PR37755.
(I tried for a while to implement this in C so that ISel could just do its
thing, but couldn't hit the right pattern -- and ISel only does shld64, not
shrd64, as far as I can tell.)
https://reviews.llvm.org/D49606
Files:
clang/lib/Headers/intrin.h
clang/test/Headers/ms-intrin.cpp
Index: clang/test/Headers/ms-intrin.cpp
===================================================================
--- clang/test/Headers/ms-intrin.cpp
+++ clang/test/Headers/ms-intrin.cpp
@@ -42,6 +42,8 @@
__stosw(0, 0, 0);
#ifdef _M_X64
+ __shiftleft128(1, 2, 3);
+ __shiftright128(1, 2, 3);
__movsq(0, 0, 0);
__stosq(0, 0, 0);
#endif
Index: clang/lib/Headers/intrin.h
===================================================================
--- clang/lib/Headers/intrin.h
+++ clang/lib/Headers/intrin.h
@@ -853,6 +853,18 @@
__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) {
+ __asm__ __volatile__ ("shldq %1, %2, %0" : "+r"(h) : "c"(d), "r"(l));
+ return h;
+}
+static __inline__ unsigned __int64 __DEFAULT_FN_ATTRS
+__shiftright128(unsigned __int64 l, unsigned __int64 h, unsigned char d) {
+ __asm__ __volatile__ ("shrdq %1, %2, %0" : "+r"(l) : "c"(d), "r"(h));
+ return l;
+}
+#endif
/*----------------------------------------------------------------------------*\
|* Privileged intrinsics
Index: clang/test/Headers/ms-intrin.cpp
===================================================================
--- clang/test/Headers/ms-intrin.cpp
+++ clang/test/Headers/ms-intrin.cpp
@@ -42,6 +42,8 @@
__stosw(0, 0, 0);
#ifdef _M_X64
+ __shiftleft128(1, 2, 3);
+ __shiftright128(1, 2, 3);
__movsq(0, 0, 0);
__stosq(0, 0, 0);
#endif
Index: clang/lib/Headers/intrin.h
===================================================================
--- clang/lib/Headers/intrin.h
+++ clang/lib/Headers/intrin.h
@@ -853,6 +853,18 @@
__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) {
+ __asm__ __volatile__ ("shldq %1, %2, %0" : "+r"(h) : "c"(d), "r"(l));
+ return h;
+}
+static __inline__ unsigned __int64 __DEFAULT_FN_ATTRS
+__shiftright128(unsigned __int64 l, unsigned __int64 h, unsigned char d) {
+ __asm__ __volatile__ ("shrdq %1, %2, %0" : "+r"(l) : "c"(d), "r"(h));
+ return l;
+}
+#endif
/*----------------------------------------------------------------------------*\
|* Privileged intrinsics
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