Skip to content
Permalink
Browse files

Add a smoketest for combining PGO with xLTO.

  • Loading branch information...
michaelwoerister committed May 20, 2019
1 parent 30a3fad commit 1de93a78147126dcb864e070734532a02dde56cc
@@ -0,0 +1,87 @@
# needs-matching-clang

# This test makes sure that cross-language inlining can be used in conjunction
# with profile-guided optimization. The test only tests that the whole workflow
# can be executed without anything crashing. It does not test whether PGO or
# xLTO have any specific effect on the generated code.

-include ../tools.mk

COMMON_FLAGS=-Copt-level=3 -Ccodegen-units=1

# LLVM doesn't support instrumenting binaries that use SEH:
# https://bugs.llvm.org/show_bug.cgi?id=41279
#
# Things work fine with -Cpanic=abort though.
ifdef IS_MSVC
COMMON_FLAGS+= -Cpanic=abort
endif

all: cpp-executable rust-executable

cpp-executable:
$(RUSTC) -Clinker-plugin-lto=on \
-Zpgo-gen="$(TMPDIR)"/cpp-profdata \
-o "$(TMPDIR)"/librustlib-xlto.a \
$(COMMON_FLAGS) \
./rustlib.rs
$(CLANG) -flto=thin \
-fprofile-generate="$(TMPDIR)"/cpp-profdata \
-fuse-ld=lld \
-L "$(TMPDIR)" \
-lrustlib-xlto \
-o "$(TMPDIR)"/cmain \
-O3 \
./cmain.c
$(TMPDIR)/cmain
# Postprocess the profiling data so it can be used by the compiler
"$(LLVM_BIN_DIR)"/llvm-profdata merge \
-o "$(TMPDIR)"/cpp-profdata/merged.profdata \
"$(TMPDIR)"/cpp-profdata/default_*.profraw
$(RUSTC) -Clinker-plugin-lto=on \
-Zpgo-use="$(TMPDIR)"/cpp-profdata/merged.profdata \
-o "$(TMPDIR)"/librustlib-xlto.a \
$(COMMON_FLAGS) \
./rustlib.rs
$(CLANG) -flto=thin \
-fprofile-use="$(TMPDIR)"/cpp-profdata/merged.profdata \
-fuse-ld=lld \
-L "$(TMPDIR)" \
-lrustlib-xlto \
-o "$(TMPDIR)"/cmain \
-O3 \
./cmain.c

rust-executable:
exit
$(CLANG) ./clib.c -fprofile-generate="$(TMPDIR)"/rs-profdata -flto=thin -c -o $(TMPDIR)/clib.o -O3
(cd $(TMPDIR); $(AR) crus ./libxyz.a ./clib.o)
$(RUSTC) -Clinker-plugin-lto=on \
-Zpgo-gen="$(TMPDIR)"/rs-profdata \
-L$(TMPDIR) \
$(COMMON_FLAGS) \
-Clinker=$(CLANG) \
-Clink-arg=-fuse-ld=lld \
-o $(TMPDIR)/rsmain \
./main.rs
$(TMPDIR)/rsmain
# Postprocess the profiling data so it can be used by the compiler
"$(LLVM_BIN_DIR)"/llvm-profdata merge \
-o "$(TMPDIR)"/rs-profdata/merged.profdata \
"$(TMPDIR)"/rs-profdata/default_*.profraw
$(CLANG) ./clib.c \
-fprofile-use="$(TMPDIR)"/rs-profdata/merged.profdata \
-flto=thin \
-c \
-o $(TMPDIR)/clib.o \
-O3
rm "$(TMPDIR)"/libxyz.a
(cd $(TMPDIR); $(AR) crus ./libxyz.a ./clib.o)
$(RUSTC) -Clinker-plugin-lto=on \
-Zpgo-use="$(TMPDIR)"/rs-profdata/merged.profdata \
-L$(TMPDIR) \
$(COMMON_FLAGS) \
-Clinker=$(CLANG) \
-Clink-arg=-fuse-ld=lld \
-o $(TMPDIR)/rsmain \
./main.rs
@@ -0,0 +1,9 @@
#include <stdint.h>

uint32_t c_always_inlined() {
return 1234;
}

__attribute__((noinline)) uint32_t c_never_inlined() {
return 12345;
}
@@ -0,0 +1,12 @@
#include <stdint.h>

// A trivial function defined in Rust, returning a constant value. This should
// always be inlined.
uint32_t rust_always_inlined();


uint32_t rust_never_inlined();

int main(int argc, char** argv) {
return (rust_never_inlined() + rust_always_inlined()) * 0;
}
@@ -0,0 +1,11 @@
#[link(name = "xyz")]
extern "C" {
fn c_always_inlined() -> u32;
fn c_never_inlined() -> u32;
}

fn main() {
unsafe {
println!("blub: {}", c_always_inlined() + c_never_inlined());
}
}
@@ -0,0 +1,12 @@
#![crate_type="staticlib"]

#[no_mangle]
pub extern "C" fn rust_always_inlined() -> u32 {
42
}

#[no_mangle]
#[inline(never)]
pub extern "C" fn rust_never_inlined() -> u32 {
421
}

0 comments on commit 1de93a7

Please sign in to comment.
You can’t perform that action at this time.