mirror of
https://github.com/rust-lang/rust.git
synced 2024-11-27 09:14:20 +00:00
48 lines
2.0 KiB
Makefile
48 lines
2.0 KiB
Makefile
# needs-profiler-support
|
|
# ignore-windows-gnu
|
|
# ignore-cross-compile
|
|
|
|
# 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
|