f72586e5b9
The ABI mandates the pcalau12i/addi.d/lu32i.d/lu52i.d instructions for
addressing a symbol to be adjacent. So model them as "one large
instruction", i.e. define_insn, with two output registers. The real
address is the sum of these two registers.
The advantage of this approach is the RTL passes can still use ldx/stx
instructions to skip an addi.d instruction.
gcc/ChangeLog:
* config/loongarch/loongarch.md (unspec): Add
UNSPEC_LA_PCREL_64_PART1 and UNSPEC_LA_PCREL_64_PART2.
(la_pcrel64_two_parts): New define_insn.
* config/loongarch/loongarch.cc (loongarch_tls_symbol): Fix a
typo in the comment.
(loongarch_call_tls_get_addr): If -mcmodel=extreme
-mexplicit-relocs={always,auto}, use la_pcrel64_two_parts for
addressing the TLS symbol and __tls_get_addr. Emit an REG_EQUAL
note to allow CSE addressing __tls_get_addr.
(loongarch_legitimize_tls_address): If -mcmodel=extreme
-mexplicit-relocs={always,auto}, address TLS IE symbols with
la_pcrel64_two_parts.
(loongarch_split_symbol): If -mcmodel=extreme
-mexplicit-relocs={always,auto}, address symbols with
la_pcrel64_two_parts.
(loongarch_output_mi_thunk): Clean up unreachable code. If
-mcmodel=extreme -mexplicit-relocs={always,auto}, address the MI
thunks with la_pcrel64_two_parts.
gcc/testsuite/ChangeLog:
* gcc.target/loongarch/func-call-extreme-1.c (dg-options):
Use -O2 instead of -O0 to ensure the pcalau12i/addi/lu32i/lu52i
instruction sequences are not reordered by the compiler.
(NOIPA): Disallow interprocedural optimizations.
* gcc.target/loongarch/func-call-extreme-2.c: Remove the content
duplicated from func-call-extreme-1.c, include it instead.
(dg-options): Likewise.
* gcc.target/loongarch/func-call-extreme-3.c (dg-options):
Likewise.
* gcc.target/loongarch/func-call-extreme-4.c (dg-options):
Likewise.
* gcc.target/loongarch/cmodel-extreme-1.c: New test.
* gcc.target/loongarch/cmodel-extreme-2.c: New test.
* g++.target/loongarch/cmodel-extreme-mi-thunk-1.C: New test.
* g++.target/loongarch/cmodel-extreme-mi-thunk-2.C: New test.
* g++.target/loongarch/cmodel-extreme-mi-thunk-3.C: New test.
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