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PGO and LTO in clang-cl

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wuggy 2026-09-12 04:29:47 -07:00
commit 70b4a79405
12 changed files with 290 additions and 15 deletions
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16
config/config.mk
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@ -210,13 +210,25 @@ ifdef CPP_UNIT_TESTS
NO_PROFILE_GUIDED_OPTIMIZE = 1
endif
# Reject stale Windows PGO configuration before compiling the first pass.
ifdef MOZ_PGO
ifdef CLANG_CL
ifeq ($(strip $(LLVM_PROFDATA)),)
$(error clang-cl PGO requires LLVM_PROFDATA; rerun ./mach configure)
endif
ifeq ($(filter -clang:-fprofile-instr-generate,$(PROFILE_GEN_CFLAGS)),)
$(error clang-cl PGO requires LLVM instrumentation flags; rerun ./mach configure)
endif
endif
endif
# Enable profile-based feedback
ifneq (1,$(NO_PROFILE_GUIDED_OPTIMIZE))
ifdef MOZ_PROFILE_GENERATE
OS_CFLAGS += $(if $(filter $(notdir $<),$(notdir $(NO_PROFILE_GUIDED_OPTIMIZE))),,$(PROFILE_GEN_CFLAGS))
OS_CXXFLAGS += $(if $(filter $(notdir $<),$(notdir $(NO_PROFILE_GUIDED_OPTIMIZE))),,$(PROFILE_GEN_CFLAGS))
OS_LDFLAGS += $(PROFILE_GEN_LDFLAGS)
ifeq (WINNT,$(OS_ARCH))
ifeq ($(OS_ARCH)_$(CLANG_CL),WINNT_)
AR_FLAGS += -LTCG
endif
endif # MOZ_PROFILE_GENERATE
@ -225,7 +237,7 @@ ifdef MOZ_PROFILE_USE
OS_CFLAGS += $(if $(filter $(notdir $<),$(notdir $(NO_PROFILE_GUIDED_OPTIMIZE))),,$(PROFILE_USE_CFLAGS))
OS_CXXFLAGS += $(if $(filter $(notdir $<),$(notdir $(NO_PROFILE_GUIDED_OPTIMIZE))),,$(PROFILE_USE_CFLAGS))
OS_LDFLAGS += $(PROFILE_USE_LDFLAGS)
ifeq (WINNT,$(OS_ARCH))
ifeq ($(OS_ARCH)_$(CLANG_CL),WINNT_)
AR_FLAGS += -LTCG
endif
endif # MOZ_PROFILE_USE

4
config/rules.mk
View file

@ -531,7 +531,7 @@ endif
##############################################
ifneq (1,$(NO_PROFILE_GUIDED_OPTIMIZE))
ifdef MOZ_PROFILE_USE
ifeq ($(OS_ARCH)_$(GNU_CC), WINNT_)
ifeq ($(OS_ARCH)_$(GNU_CC)_$(CLANG_CL), WINNT__)
# When building with PGO, we have to make sure to re-link
# in the MOZ_PROFILE_USE phase if we linked in the
# MOZ_PROFILE_GENERATE phase. We'll touch this pgo.relink
@ -563,7 +563,7 @@ endif # MOZ_PROFILE_USE
ifdef MOZ_PROFILE_GENERATE
# Clean up profiling data during PROFILE_GENERATE phase
export::
ifeq ($(OS_ARCH)_$(GNU_CC), WINNT_)
ifeq ($(OS_ARCH)_$(GNU_CC)_$(CLANG_CL), WINNT__)
$(foreach pgd,$(wildcard *.pgd),pgomgr -clear $(pgd);)
else
ifdef GNU_CC