From 9aabd84f8f52042cd4e3434ae883f1c68d757b31 Mon Sep 17 00:00:00 2001
From: Hal Finkel <hfinkel@anl.gov>
Date: Mon, 31 Aug 2015 23:55:19 +0000
Subject: [PATCH] [PowerPC] Support __builtin_ppc_get_timebase
GCC 4.8+ has a PowerPC-specific intrinsic, __builtin_ppc_get_timebase, to do
what Clang's __builtin_readcyclecounter does. For compatibility with code that
uses GCC's spelling (including glibc), support it as well.
Partially fixes PR23681.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@246510 91177308-0d34-0410-b5e6-96231b3b80d8
---
include/clang/Basic/BuiltinsPPC.def | 2 ++
lib/CodeGen/CGBuiltin.cpp | 5 +++++
test/CodeGen/builtins-ppc.c | 7 +++++++
3 files changed, 14 insertions(+)
diff --git a/include/clang/Basic/BuiltinsPPC.def b/include/clang/Basic/BuiltinsPPC.def
index fdf1cb0b5a4..3e2861d43e8 100644
--- a/include/clang/Basic/BuiltinsPPC.def
+++ b/include/clang/Basic/BuiltinsPPC.def
@@ -17,6 +17,8 @@
// The format of this database matches clang/Basic/Builtins.def.
+BUILTIN(__builtin_ppc_get_timebase, "ULLi", "n")
+
// This is just a placeholder, the types and attributes are wrong.
BUILTIN(__builtin_altivec_vaddcuw, "V4UiV4UiV4Ui", "")
diff --git a/lib/CodeGen/CGBuiltin.cpp b/lib/CodeGen/CGBuiltin.cpp
index 6966b03ef3b..a04a1c12560 100644
--- a/lib/CodeGen/CGBuiltin.cpp
+++ b/lib/CodeGen/CGBuiltin.cpp
@@ -6414,6 +6414,11 @@ Value *CodeGenFunction::EmitPPCBuiltinExpr(unsigned BuiltinID,
switch (BuiltinID) {
default: return nullptr;
+ // __builtin_ppc_get_timebase is GCC 4.8+'s PowerPC-specific name for what we
+ // call __builtin_readcyclecounter.
+ case PPC::BI__builtin_ppc_get_timebase:
+ return Builder.CreateCall(CGM.getIntrinsic(Intrinsic::readcyclecounter));
+
// vec_ld, vec_lvsl, vec_lvsr
case PPC::BI__builtin_altivec_lvx:
case PPC::BI__builtin_altivec_lvxl:
diff --git a/test/CodeGen/builtins-ppc.c b/test/CodeGen/builtins-ppc.c
index 9ef5e3708f5..1f17787ad9c 100644
--- a/test/CodeGen/builtins-ppc.c
+++ b/test/CodeGen/builtins-ppc.c
@@ -7,3 +7,10 @@ void test_eh_return_data_regno()
res = __builtin_eh_return_data_regno(0); // CHECK: store volatile i32 3
res = __builtin_eh_return_data_regno(1); // CHECK: store volatile i32 4
}
+
+// CHECK-LABEL: define i64 @test_builtin_ppc_get_timebase
+long long test_builtin_ppc_get_timebase() {
+ // CHECK: call i64 @llvm.readcyclecounter()
+ return __builtin_ppc_get_timebase();
+}
+
--
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