rust/tests/run-make/pgo-branch-weights/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

# For some very small programs GNU ld seems to not properly handle
# instrumentation sections correctly. Neither Gold nor LLD have that problem.
ifeq ($(UNAME),Linux)
ifneq (,$(findstring x86,$(TARGET)))
COMMON_FLAGS=-Clink-args=-fuse-ld=gold
endif
endif


all:
	# We don't compile `opaque` with either optimizations or instrumentation.
	$(RUSTC) $(COMMON_FLAGS) opaque.rs || exit 1
	# Compile the test program with instrumentation
	mkdir -p "$(TMPDIR)/prof_data_dir" || exit 1
	$(RUSTC) $(COMMON_FLAGS) interesting.rs \
		-Cprofile-generate="$(TMPDIR)/prof_data_dir" -O -Ccodegen-units=1 || exit 1
	$(RUSTC) $(COMMON_FLAGS) main.rs -Cprofile-generate="$(TMPDIR)/prof_data_dir" -O || exit 1
	# The argument below generates to the expected branch weights
	$(call RUN,main aaaaaaaaaaaa2bbbbbbbbbbbb2bbbbbbbbbbbbbbbbcc) || exit 1
	"$(LLVM_BIN_DIR)/llvm-profdata" merge \
		-o "$(TMPDIR)/prof_data_dir/merged.profdata" \
		"$(TMPDIR)/prof_data_dir" || exit 1
	$(RUSTC) $(COMMON_FLAGS) interesting.rs \
		-Cprofile-use="$(TMPDIR)/prof_data_dir/merged.profdata" -O \
		-Ccodegen-units=1 --emit=llvm-ir || exit 1
	cat "$(TMPDIR)/interesting.ll" | "$(LLVM_FILECHECK)" filecheck-patterns.txt