Enabling 3DNow! prefetch instruction support for a few AMD processors in the
clang front end. This change will allow the __PRFCHW__ macro to be set on these
processors and hence include prfchwintrin.h in x86intrin.h header. Support for
the intrinsic itself seems to have already been added in r178041.
Differential Revision: http://llvm-reviews.chandlerc.com/D1934
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@192829 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Basic/Targets.cpp b/lib/Basic/Targets.cpp
index 09e7dad..701c0a9 100644
--- a/lib/Basic/Targets.cpp
+++ b/lib/Basic/Targets.cpp
@@ -2120,6 +2120,7 @@
setFeatureEnabledImpl(Features, "cx16", true);
setFeatureEnabledImpl(Features, "lzcnt", true);
setFeatureEnabledImpl(Features, "popcnt", true);
+ setFeatureEnabledImpl(Features, "prfchw", true);
break;
case CK_BTVER2:
setFeatureEnabledImpl(Features, "avx", true);
@@ -2127,6 +2128,7 @@
setFeatureEnabledImpl(Features, "lzcnt", true);
setFeatureEnabledImpl(Features, "aes", true);
setFeatureEnabledImpl(Features, "pclmul", true);
+ setFeatureEnabledImpl(Features, "prfchw", true);
setFeatureEnabledImpl(Features, "bmi", true);
setFeatureEnabledImpl(Features, "f16c", true);
setFeatureEnabledImpl(Features, "cx16", true);
@@ -2136,6 +2138,7 @@
setFeatureEnabledImpl(Features, "lzcnt", true);
setFeatureEnabledImpl(Features, "aes", true);
setFeatureEnabledImpl(Features, "pclmul", true);
+ setFeatureEnabledImpl(Features, "prfchw", true);
setFeatureEnabledImpl(Features, "cx16", true);
break;
case CK_BDVER2:
@@ -2143,6 +2146,7 @@
setFeatureEnabledImpl(Features, "lzcnt", true);
setFeatureEnabledImpl(Features, "aes", true);
setFeatureEnabledImpl(Features, "pclmul", true);
+ setFeatureEnabledImpl(Features, "prfchw", true);
setFeatureEnabledImpl(Features, "bmi", true);
setFeatureEnabledImpl(Features, "fma", true);
setFeatureEnabledImpl(Features, "f16c", true);
@@ -2467,6 +2471,13 @@
Features.push_back("+popcnt");
}
+ // Enable prfchw if 3DNow! is enabled and prfchw is not explicitly disabled.
+ if (!HasPRFCHW && MMX3DNowLevel >= AMD3DNow &&
+ std::find(Features.begin(), Features.end(), "-prfchw") == Features.end()){
+ HasPRFCHW = true;
+ Features.push_back("+prfchw");
+ }
+
// LLVM doesn't have a separate switch for fpmath, so only accept it if it
// matches the selected sse level.
if (FPMath == FP_SSE && SSELevel < SSE1) {