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-rw-r--r--clang/lib/Driver/ToolChains/Clang.cpp31
1 files changed, 31 insertions, 0 deletions
diff --git a/clang/lib/Driver/ToolChains/Clang.cpp b/clang/lib/Driver/ToolChains/Clang.cpp
index 1741517bffb..ef5e64bc944 100644
--- a/clang/lib/Driver/ToolChains/Clang.cpp
+++ b/clang/lib/Driver/ToolChains/Clang.cpp
@@ -4694,6 +4694,37 @@ void Clang::ConstructJob(Compilation &C, const JobAction &JA,
CmdArgs.push_back("-fwhole-program-vtables");
}
+ if (Arg *A = Args.getLastArg(options::OPT_fexperimental_isel,
+ options::OPT_fno_experimental_isel)) {
+ CmdArgs.push_back("-mllvm");
+ if (A->getOption().matches(options::OPT_fexperimental_isel)) {
+ CmdArgs.push_back("-global-isel=1");
+
+ // GISel is on by default on AArch64 -O0, so don't bother adding
+ // the fallback remarks for it. Other combinations will add a warning of
+ // some kind.
+ bool IsArchSupported = Triple.getArch() == llvm::Triple::aarch64;
+ bool IsOptLevelSupported = false;
+
+ Arg *A = Args.getLastArg(options::OPT_O_Group);
+ if (Triple.getArch() == llvm::Triple::aarch64) {
+ if (!A || A->getOption().matches(options::OPT_O0))
+ IsOptLevelSupported = true;
+ }
+ if (!IsArchSupported || !IsOptLevelSupported) {
+ CmdArgs.push_back("-mllvm");
+ CmdArgs.push_back("-global-isel-abort=2");
+
+ if (!IsArchSupported)
+ D.Diag(diag::warn_drv_experimental_isel_incomplete) << Triple.getArchName();
+ else
+ D.Diag(diag::warn_drv_experimental_isel_incomplete_opt);
+ }
+ } else {
+ CmdArgs.push_back("-global-isel=0");
+ }
+ }
+
// Finally add the compile command to the compilation.
if (Args.hasArg(options::OPT__SLASH_fallback) &&
Output.getType() == types::TY_Object &&
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