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| author | Fangrui Song <maskray@google.com> | 2024-01-11 10:24:25 -0800 |
|---|---|---|
| committer | H.J. Lu <(no_default)> | 2024-01-30 15:21:04 -0800 |
| commit | d7250100381b817114447d91fff4748526d4fb21 (patch) | |
| tree | 8ffd0604735438337ee4856ec7994a83153e167f /gcc/c | |
| parent | f2061b2a9641c2228d4e2d86f19532ad7e93d627 (diff) | |
| download | gcc-d7250100381b817114447d91fff4748526d4fb21.zip gcc-d7250100381b817114447d91fff4748526d4fb21.tar.gz gcc-d7250100381b817114447d91fff4748526d4fb21.tar.bz2 | |
i386: Add "Ws" constraint for symbolic address/label reference [PR105576]
Printing the raw symbol is useful in inline asm (e.g. in C++ to get the
mangled name). Similar constraints are available in other targets (e.g.
"S" for aarch64/riscv, "Cs" for m68k).
There isn't a good way for x86 yet, e.g. "i" doesn't work for
PIC/-mcmodel=large. This patch adds "Ws". Here are possible use cases:
```
namespace ns { extern int var; }
asm (".pushsection .xxx,\"aw\"; .dc.a %0; .popsection" :: "Ws"(&var));
asm (".reloc ., BFD_RELOC_NONE, %0" :: "Ws"(&var));
```
gcc/ChangeLog:
PR target/105576
* config/i386/constraints.md: Define constraint "Ws".
* doc/md.texi: Document it.
gcc/testsuite/ChangeLog:
PR target/105576
* gcc.target/i386/asm-raw-symbol.c: New testcase.
Diffstat (limited to 'gcc/c')
0 files changed, 0 insertions, 0 deletions