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tcg: Mark tcg helpers noinline to avoid an issue with LTO 

Marking helpers __attribute__((noinline)) prevents an issue
with GCC's ipa-split pass under --enable-lto.

Resolves: https://gitlab.com/qemu-project/qemu/-/issues/1454
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Tested-by: Idan Horowitz <idan.horowitz@gmail.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2023-01-19 06:46:16 -10:00
parent 2466bb3b08
commit 6aa89be5c5
1 changed files with 24 additions and 8 deletions
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32
include/exec/helper-proto.h
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@ -6,34 +6,49 @@
#include "exec/helper-head.h"
/*
* Work around an issue with --enable-lto, in which GCC's ipa-split pass
* decides to split out the noreturn code paths that raise an exception,
* taking the __builtin_return_address() along into the new function,
* where it no longer computes a value that returns to TCG generated code.
* Despite the name, the noinline attribute affects splitter, so this
* prevents the optimization in question. Given that helpers should not
* otherwise be called directly, this should have any other visible effect.
*
* See https://gitlab.com/qemu-project/qemu/-/issues/1454
*/
#define DEF_HELPER_ATTR __attribute__((noinline))
#define DEF_HELPER_FLAGS_0(name, flags, ret) \
dh_ctype(ret) HELPER(name) (void);
dh_ctype(ret) HELPER(name) (void) DEF_HELPER_ATTR;
#define DEF_HELPER_FLAGS_1(name, flags, ret, t1) \
dh_ctype(ret) HELPER(name) (dh_ctype(t1));
dh_ctype(ret) HELPER(name) (dh_ctype(t1)) DEF_HELPER_ATTR;
#define DEF_HELPER_FLAGS_2(name, flags, ret, t1, t2) \
dh_ctype(ret) HELPER(name) (dh_ctype(t1), dh_ctype(t2));
dh_ctype(ret) HELPER(name) (dh_ctype(t1), dh_ctype(t2)) DEF_HELPER_ATTR;
#define DEF_HELPER_FLAGS_3(name, flags, ret, t1, t2, t3) \
dh_ctype(ret) HELPER(name) (dh_ctype(t1), dh_ctype(t2), dh_ctype(t3));
dh_ctype(ret) HELPER(name) (dh_ctype(t1), dh_ctype(t2), \
dh_ctype(t3)) DEF_HELPER_ATTR;
#define DEF_HELPER_FLAGS_4(name, flags, ret, t1, t2, t3, t4) \
dh_ctype(ret) HELPER(name) (dh_ctype(t1), dh_ctype(t2), dh_ctype(t3), \
dh_ctype(t4));
dh_ctype(t4)) DEF_HELPER_ATTR;
#define DEF_HELPER_FLAGS_5(name, flags, ret, t1, t2, t3, t4, t5) \
dh_ctype(ret) HELPER(name) (dh_ctype(t1), dh_ctype(t2), dh_ctype(t3), \
dh_ctype(t4), dh_ctype(t5));
dh_ctype(t4), dh_ctype(t5)) DEF_HELPER_ATTR;
#define DEF_HELPER_FLAGS_6(name, flags, ret, t1, t2, t3, t4, t5, t6) \
dh_ctype(ret) HELPER(name) (dh_ctype(t1), dh_ctype(t2), dh_ctype(t3), \
dh_ctype(t4), dh_ctype(t5), dh_ctype(t6));
dh_ctype(t4), dh_ctype(t5), \
dh_ctype(t6)) DEF_HELPER_ATTR;
#define DEF_HELPER_FLAGS_7(name, flags, ret, t1, t2, t3, t4, t5, t6, t7) \
dh_ctype(ret) HELPER(name) (dh_ctype(t1), dh_ctype(t2), dh_ctype(t3), \
dh_ctype(t4), dh_ctype(t5), dh_ctype(t6), \
dh_ctype(t7));
dh_ctype(t7)) DEF_HELPER_ATTR;
#define IN_HELPER_PROTO
@ -51,5 +66,6 @@ dh_ctype(ret) HELPER(name) (dh_ctype(t1), dh_ctype(t2), dh_ctype(t3), \
#undef DEF_HELPER_FLAGS_5
#undef DEF_HELPER_FLAGS_6
#undef DEF_HELPER_FLAGS_7
#undef DEF_HELPER_ATTR
#endif /* HELPER_PROTO_H */