From 631cd5845e8de329d0e227aaa707d7ea228b8f8f Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Wed, 17 Apr 2024 14:20:29 +0200 Subject: Merging upstream version 1.70.0+dfsg1. Signed-off-by: Daniel Baumann --- tests/run-make/pgo-use/Makefile | 46 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 46 insertions(+) create mode 100644 tests/run-make/pgo-use/Makefile (limited to 'tests/run-make/pgo-use/Makefile') diff --git a/tests/run-make/pgo-use/Makefile b/tests/run-make/pgo-use/Makefile new file mode 100644 index 000000000..3bac9b77a --- /dev/null +++ b/tests/run-make/pgo-use/Makefile @@ -0,0 +1,46 @@ +# needs-profiler-support +# ignore-windows-gnu + +# FIXME(mati865): MinGW GCC miscompiles compiler-rt profiling library but with Clang it works +# properly. Since we only have GCC on the CI ignore the test for now. + +include ../tools.mk + +# This test makes sure that PGO profiling data leads to cold functions being +# marked as `cold` and hot functions with `inlinehint`. +# The test program contains an `if` were actual execution only ever takes the +# `else` branch. Accordingly, we expect the function that is never called to +# be marked as cold. +# +# Disable the pre-inlining pass (i.e. a pass that does some inlining before +# it adds the profiling instrumentation). Disabling this pass leads to +# rather predictable IR which we need for this test to be stable. + +COMMON_FLAGS=-Copt-level=2 -Ccodegen-units=1 -Cllvm-args=-disable-preinline + +ifeq ($(UNAME),Darwin) +# macOS does not have the `tac` command, but `tail -r` does the same thing +TAC := tail -r +else +# some other platforms don't support the `-r` flag for `tail`, so use `tac` +TAC := tac +endif + +all: + # Compile the test program with instrumentation + $(RUSTC) $(COMMON_FLAGS) -Cprofile-generate="$(TMPDIR)" main.rs + # Run it in order to generate some profiling data + $(call RUN,main some-argument) || exit 1 + # Postprocess the profiling data so it can be used by the compiler + "$(LLVM_BIN_DIR)"/llvm-profdata merge \ + -o "$(TMPDIR)"/merged.profdata \ + "$(TMPDIR)"/default_*.profraw + # Compile the test program again, making use of the profiling data + $(RUSTC) $(COMMON_FLAGS) -Cprofile-use="$(TMPDIR)"/merged.profdata --emit=llvm-ir main.rs + # Check that the generate IR contains some things that we expect + # + # We feed the file into LLVM FileCheck tool *in reverse* so that we see the + # line with the function name before the line with the function attributes. + # FileCheck only supports checking that something matches on the next line, + # but not if something matches on the previous line. + $(TAC) "$(TMPDIR)"/main.ll | "$(LLVM_FILECHECK)" filecheck-patterns.txt -- cgit v1.2.3