This patch optimizes the prolog and epilog code to reduce the number of
instructions and avoid multiple writes to SP. The key idea is that epilogs
are almost exact reverses of prologs, and thus all the decisions only need
to be taken once. The frame layout is decided in aarch64_layout_frame()
and decisions recorded in the new aarch64_frame fields initial_adjust,
callee_adjust, callee_offset and final_adjust.
A generic frame setup consists of 5 basic steps:
1. sub sp, sp, initial_adjust
2. stp reg1, reg2, [sp, -callee_adjust]! (push if callee_adjust != 0)
3. add fp, sp, callee_offset (if frame_pointer_needed)
4. stp reg3, reg4, [sp, callee_offset + N*16] (store remaining callee-saves)
5. sub sp, sp, final_adjust
The epilog reverses this, and may omit step 3 if alloca wasn't used.
gcc/
* config/aarch64/aarch64.h (aarch64_frame):
Remove padding0 and hardfp_offset. Add locals_offset,
initial_adjust, callee_adjust, callee_offset and final_adjust.
* config/aarch64/aarch64.c (aarch64_layout_frame):
Remove unused padding0 and hardfp_offset initializations.
Choose frame layout and set frame variables accordingly.
Use INVALID_REGNUM instead of FIRST_PSEUDO_REGISTER.
(aarch64_push_regs): Use INVALID_REGNUM, not FIRST_PSEUDO_REGISTER.
(aarch64_pop_regs): Likewise.
(aarch64_expand_prologue): Remove all decision code, just emit
prolog according to frame variables.
(aarch64_expand_epilogue): Remove all decision code, just emit
epilog according to frame variables.
(aarch64_initial_elimination_offset): Use offset to local/arg area.
testsuite/
* gcc.target/aarch64/test_frame_10.c: Fix test to check for a
single stack adjustment, no writeback.
* gcc.target/aarch64/test_frame_12.c: Likewise.
* gcc.target/aarch64/test_frame_13.c: Likewise.
* gcc.target/aarch64/test_frame_15.c: Likewise.
* gcc.target/aarch64/test_frame_6.c: Likewise.
* gcc.target/aarch64/test_frame_7.c: Likewise.
* gcc.target/aarch64/test_frame_8.c: Likewise.
* gcc.target/aarch64/test_frame_16.c: New test.
From-SVN: r238960
* constexpr.c (cxx_eval_pointer_plus_expression): Check constancy
of nelts.
* cp-gimplify.c (cp_fully_fold): Only maybe_constant_value in
C++11 and up.
From-SVN: r238957
TImode register referenced in debug insn can be converted to V1TImode by
scalar to vector optimization. When converting a TImode store to V1TImode,
we need to check all debug insns on its use chain to convert the V1TImode
register to SUBREG TImode if source register is undefined.
gcc/
PR target/72748
* config/i386/i386.c (timode_scalar_chain::convert_insn): Call
fix_debug_reg_uses after changing source register mode to
V1TImode if source register is undefined.
gcc/testsuite/
PR target/72748
* gcc.target/i386/pr72748.c: New test.
From-SVN: r238956
* testsuite/20_util/tuple/cons/66338.cc: Limit test to C++11 and
later.
* testsuite/20_util/tuple/cons/element_accepts_anything_byval.cc:
Likewise.
From-SVN: r238945
* testsuite/27_io/ios_base/types/fmtflags/case_label.cc: Make test
supported for C++11 and later.
* testsuite/27_io/ios_base/types/iostate/case_label.cc: Likewise.
* testsuite/27_io/ios_base/types/openmode/case_label.cc: Likewise.
From-SVN: r238939
* config/aarch64/aarch64.c (aarch64_classify_address): Use DImode when
performing aarch64_offset_7bit_signed_scaled_p check for TImode LDP/STP
addresses.
* gcc.target/aarch64/ldp_stp_unaligned_1.c: New test.
From-SVN: r238938
* testsuite/28_regex/basic_regex/ctors/basic/raw_string.cc: Fix
test to not rely on GNU extension (escaped normal characters in POSIX
BRE). Enable tests for other strings which are now supported.
From-SVN: r238926
* lib/target-supports.exp (check_effective_target_c): Fix indentation.
(check_effective_target_c++): Likewise. Also match for libstdc++.
From-SVN: r238916
2016-07-30 Steven G. Kargl <kargl@gcc.gnu.org>
PR fortran/41922
* target-memory.c (expr_to_char): Pass in locus and use it in error
messages.
(gfc_merge_initializers): Ditto.
* target-memory.h: Update prototype for gfc_merge_initializers ().
* trans-common.c (get_init_field): Use the correct locus.
2016-07-30 Steven G. Kargl <kargl@gcc.gnu.org>
PR fortran/41922
* gfortran.dg/equiv_constraint_5.f90: Adjust the error message.
* gfortran.dg/equiv_constraint_7.f90: Ditto.
* gfortran.dg/pr41922.f90: New test.
From-SVN: r238915
2016-07-30 Steven G. Kargl <kargl@gcc.gnu.org>
PR fortran/68566
* check.c (gfc_check_reshape): Check for constant expression.
2016-07-30 Steven G. Kargl <kargl@gcc.gnu.org>
PR fortran/68566
* gfortran.dg/pr68566.f90: new test.
From-SVN: r238911
[gcc]
2016-07-30 Michael Meissner <meissner@linux.vnet.ibm.com>
* config/rs6000/rs6000-protos.h (rs6000_adjust_vec_address): New
function that takes a vector memory address, a hard register, an
element number and a temporary base register, and recreates an
address that points to the appropriate element within the vector.
* config/rs6000/rs6000.c (rs6000_adjust_vec_address): Likewise.
(rs6000_split_vec_extract_var): Add support for the target of a
vec_extract with variable element number being a scalar memory
location.
(rtx_is_swappable_p): VLSO insns (UNSPEC_VSX_VSLOW) are not
swappable.
* config/rs6000/vsx.md (vsx_extract_<mode>_load): Replace
vsx_extract_<mode>_load insn with a new insn that optimizes
storing either element to a memory location, using scratch
registers to pick apart the vector and reconstruct the address.
(vsx_extract_<P:mode>_<VSX_D:mode>_load): Likewise.
(vsx_extract_<mode>_store): Rework alternatives to more correctly
support Altivec registers. Add support for ISA 3.0 Altivec d-form
store instruction.
(vsx_extract_<mode>_var): Add support for extracting a variable
element number from memory.
[gcc/testsuite]
2016-07-30 Michael Meissner <meissner@linux.vnet.ibm.com>
* gcc.target/powerpc/vec-extract-2.c: New tests for vec_extract of
vector double or vector long where the vector is in memory.
* gcc.target/powerpc/vec-extract-3.c: Likewise.
* gcc.target/powerpc/vec-extract-4.c: Likewise.
From-SVN: r238908
2016-07-30 Steven G. Kargl <kargl@gcc.gnu.org>
PR fortran/69867
* decl.c (build_struct): Ensure that pointers point to something.
2016-07-30 Steven G. Kargl <kargl@gcc.gnu.org>
PR fortran/69867
* gfortran.dg/pr69867.f90: New test.
From-SVN: r238907
2016-07-30 Steven G. Kargl <kargl@gcc.gnu.org>
PR fortran/69962
* decl.c (gfc_set_constant_character_len): if expr is not
constant issue an error instead of an ICE.
2016-07-30 Steven G. Kargl <kargl@gcc.gnu.org>
PR fortran/69962
* gfortran.dg/pr69962.f90: New test.
From-SVN: r238906
2016-07-30 Steven G. Kargl <kargl@gcc.gnu.org>
PR fortran/70006
* io.c (gfc_resolve_dt): Use correct locus.
* resolve.c (resolve_branch): Ditto.
2016-07-30 Steven G. Kargl <kargl@gcc.gnu.org>
PR fortran/70006
* gfortran.dg/pr70006.f90: New test.
From-SVN: r238905
Wilco Dijkstra