[PATCH] D15829: [PGO] Clang Option that enables IR level PGO instrumentation

[Sean Silva via cfe-commits]

silvas added a comment.

Apologies for the delay. At this point, I think that this patch has evolved enough that it is best to start a new patch. I think the steps forward are:

- Have cc1 accept -fprofile-instrument=llvm (requires no driver changes, but is enough for developers to test by being careful and manually passing it)
- Start a discussion on llvm-dev to decide on the driver-level
- implement other driver features as discussed
  - e.g. if we decide that -fprofile-instr-use= should detect FE/IR (i.e. IR is not a separate flag), add FE/IR detection for -fprofile-instr-use=


================
Comment at: test/CodeGen/pgo-instrumentation.c:4
@@ +3,3 @@
+// Ensure Pass PGOInstrumentationGenPass is invoked.
+// RUN: %clang -O2 -c -Xclang -fprofile-instrument=llvm -fprofile-instr-generate %s -mllvm -debug-pass=Structure 2>&1 | FileCheck %s -check-prefix=CHECK-PGOGENPASS-INVOKED-INSTR-GEN
+// CHECK-PGOGENPASS-INVOKED-INSTR-GEN: PGOInstrumentationGenPass
----------------
Use `%clang_cc1` here and elsewhere.


http://reviews.llvm.org/D15829