RISC-V: Implement __builtin_thread_pointer
RISC-V has a dedicate register for thread pointer which is specified in psABI doc, so we could support __builtin_thread_pointer in straightforward way. Note: clang/llvm was supported __builtin_thread_pointer for RISC-V port recently. - https://reviews.llvm.org/rGaabc24acf0d5f8677bd22fe9c108581e07c3e180 gcc/ChangeLog: * config/riscv/riscv.md (get_thread_pointer<mode>): New. (TP_REGNUM): Ditto. * doc/extend.texi (Target Builtins): Add RISC-V built-in section. Document __builtin_thread_pointer. gcc/testsuite/ChangeLog: * gcc.target/riscv/read-thread-pointer.c: New.
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@ -70,6 +70,7 @@
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(define_constants
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(define_constants
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[(RETURN_ADDR_REGNUM 1)
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[(RETURN_ADDR_REGNUM 1)
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(GP_REGNUM 3)
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(GP_REGNUM 3)
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(TP_REGNUM 4)
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(T0_REGNUM 5)
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(T0_REGNUM 5)
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(T1_REGNUM 6)
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(T1_REGNUM 6)
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(S0_REGNUM 8)
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(S0_REGNUM 8)
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@ -2515,6 +2516,13 @@
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DONE;
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DONE;
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})
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})
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;; Named pattern for expanding thread pointer reference.
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(define_expand "get_thread_pointer<mode>"
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[(set (match_operand:P 0 "register_operand" "=r")
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(reg:P TP_REGNUM))]
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""
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{})
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(include "sync.md")
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(include "sync.md")
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(include "peephole.md")
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(include "peephole.md")
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(include "pic.md")
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(include "pic.md")
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@ -13859,6 +13859,7 @@ instructions, but allow the compiler to schedule those calls.
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* PowerPC Hardware Transactional Memory Built-in Functions::
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* PowerPC Hardware Transactional Memory Built-in Functions::
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* PowerPC Atomic Memory Operation Functions::
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* PowerPC Atomic Memory Operation Functions::
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* PowerPC Matrix-Multiply Assist Built-in Functions::
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* PowerPC Matrix-Multiply Assist Built-in Functions::
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* RISC-V Built-in Functions::
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* RX Built-in Functions::
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* RX Built-in Functions::
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* S/390 System z Built-in Functions::
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* S/390 System z Built-in Functions::
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* SH Built-in Functions::
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* SH Built-in Functions::
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@ -21471,6 +21472,16 @@ vec_t __builtin_vsx_xvcvspbf16 (vec_t);
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vec_t __builtin_vsx_xvcvbf16sp (vec_t);
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vec_t __builtin_vsx_xvcvbf16sp (vec_t);
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@end smallexample
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@end smallexample
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@node RISC-V Built-in Functions
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@subsection RISC-V Built-in Functions
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These built-in functions are available for the RISC-V family of
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processors.
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@deftypefn {Built-in Function} {void *} __builtin_thread_pointer (void)
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Returns the value that is currently set in the @samp{tp} register.
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@end deftypefn
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@node RX Built-in Functions
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@node RX Built-in Functions
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@subsection RX Built-in Functions
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@subsection RX Built-in Functions
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GCC supports some of the RX instructions which cannot be expressed in
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GCC supports some of the RX instructions which cannot be expressed in
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7
gcc/testsuite/gcc.target/riscv/read-thread-pointer.c
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7
gcc/testsuite/gcc.target/riscv/read-thread-pointer.c
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/* { dg-do compile } */
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void *get_tp()
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{
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return __builtin_thread_pointer ();
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}
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/* { dg-final { scan-assembler "mv\[ \t\]*[at][0-9]+,tp" } } */
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