Re-apply "r226548 - Introduce SPIR calling conventions" reverted in r226558.

The test was fixed after a discussion with the revision author: the check
pattern was made more flexible as the "%call" part is not what we actually want
to check strictly there.

The original patch description:
===
Introduce SPIR calling conventions.

This implements Section 3.7 from the SPIR 1.2 spec:

    SPIR kernels should use "spir_kernel" calling convention.
    Non-kernel functions use "spir_func" calling convention. All
    other calling conventions are disallowed.

The patch works only for OpenCL source. Any other uses will need
to ensure that kernels are assigned the spir_kernel calling
convention correctly.
===

llvm-svn: 226561

1 files changed, 9 insertions, 0 deletions

diff --git a/clang/lib/Basic/Targets.cpp b/clang/lib/Basic/Targets.cpp
index 9aac3b78643..476217146ed 100644
--- a/clang/lib/Basic/Targets.cpp
+++ b/clang/lib/Basic/Targets.cpp
@@ -6346,6 +6346,15 @@ namespace {
     BuiltinVaListKind getBuiltinVaListKind() const override {
       return TargetInfo::VoidPtrBuiltinVaList;
     }
+
+    CallingConvCheckResult checkCallingConvention(CallingConv CC) const override {
+      return (CC == CC_SpirFunction ||
+              CC == CC_SpirKernel) ? CCCR_OK : CCCR_Warning;
+    }
+
+    CallingConv getDefaultCallingConv(CallingConvMethodType MT) const override {
+      return CC_SpirFunction;
+    }
   };