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re PR target/63534 (Bootstrap failure on x86_64/i686-linux)
gcc/ PR target/63534 * config/i386/i386.c (ix86_init_pic_reg): Emit SET_GOT to REAL_PIC_OFFSET_TABLE_REGNUM for mcount profiling. (ix86_save_reg): Save REAL_PIC_OFFSET_TABLE_REGNUM when profiling using mcount in 32bit PIC mode. (ix86_elim_entry_set_got): New. (ix86_expand_prologue): For the mcount profiling emit new SET_GOT in PROLOGUE, delete initial if possible. gcc/testsuite/ PR target/63534 * gcc.target/i386/mcount_pic.c: New. From-SVN: r216975
This commit is contained in:
Evgeny Stupachenko
Ilya Enkovich
parent
bae83890e2
commit
9a2db19920
gcc
@ -1,3 +1,14 @@
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2014-10-31 Evgeny Stupachenko <evstupac@gmail.com>
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PR target/63534
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* config/i386/i386.c (ix86_init_pic_reg): Emit SET_GOT to
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REAL_PIC_OFFSET_TABLE_REGNUM for mcount profiling.
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(ix86_save_reg): Save REAL_PIC_OFFSET_TABLE_REGNUM when profiling
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using mcount in 32bit PIC mode.
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(ix86_elim_entry_set_got): New.
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(ix86_expand_prologue): For the mcount profiling emit new SET_GOT
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in PROLOGUE, delete initial if possible.
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2014-10-31 Eric Botcazou <ebotcazou@adacore.com>
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* ipa-inline.c (want_inline_small_function_p): Fix typo and formatting.
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@ -6205,8 +6205,15 @@ ix86_init_pic_reg (void)
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}
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else
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{
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rtx insn = emit_insn (gen_set_got (pic_offset_table_rtx));
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/* If there is future mcount call in the function it is more profitable
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to emit SET_GOT into ABI defined REAL_PIC_OFFSET_TABLE_REGNUM. */
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rtx reg = crtl->profile
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? gen_rtx_REG (Pmode, REAL_PIC_OFFSET_TABLE_REGNUM)
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: pic_offset_table_rtx;
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rtx insn = emit_insn (gen_set_got (reg));
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RTX_FRAME_RELATED_P (insn) = 1;
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if (crtl->profile)
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emit_move_insn (pic_offset_table_rtx, reg);
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add_reg_note (insn, REG_CFA_FLUSH_QUEUE, NULL_RTX);
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}
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@ -9486,15 +9493,23 @@ ix86_select_alt_pic_regnum (void)
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static bool
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ix86_save_reg (unsigned int regno, bool maybe_eh_return)
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{
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if (pic_offset_table_rtx
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&& !ix86_use_pseudo_pic_reg ()
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&& regno == REAL_PIC_OFFSET_TABLE_REGNUM
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&& (df_regs_ever_live_p (REAL_PIC_OFFSET_TABLE_REGNUM)
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|| crtl->profile
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|| crtl->calls_eh_return
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|| crtl->uses_const_pool
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|| cfun->has_nonlocal_label))
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return ix86_select_alt_pic_regnum () == INVALID_REGNUM;
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if (regno == REAL_PIC_OFFSET_TABLE_REGNUM
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&& pic_offset_table_rtx)
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{
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if (ix86_use_pseudo_pic_reg ())
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{
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/* REAL_PIC_OFFSET_TABLE_REGNUM used by call to
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_mcount in prologue. */
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if (!TARGET_64BIT && flag_pic && crtl->profile)
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return true;
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}
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else if (df_regs_ever_live_p (REAL_PIC_OFFSET_TABLE_REGNUM)
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|| crtl->profile
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|| crtl->calls_eh_return
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|| crtl->uses_const_pool
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|| cfun->has_nonlocal_label)
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return ix86_select_alt_pic_regnum () == INVALID_REGNUM;
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}
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if (crtl->calls_eh_return && maybe_eh_return)
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{
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@ -10833,6 +10848,29 @@ ix86_finalize_stack_realign_flags (void)
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crtl->stack_realign_finalized = true;
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}
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/* Delete SET_GOT right after entry block if it is allocated to reg. */
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static void
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ix86_elim_entry_set_got (rtx reg)
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{
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basic_block bb = ENTRY_BLOCK_PTR_FOR_FN (cfun)->next_bb;
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rtx_insn *c_insn = BB_HEAD (bb);
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if (!NONDEBUG_INSN_P (c_insn))
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c_insn = next_nonnote_nondebug_insn (c_insn);
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if (c_insn && NONJUMP_INSN_P (c_insn))
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{
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rtx pat = PATTERN (c_insn);
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if (GET_CODE (pat) == PARALLEL)
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{
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rtx vec = XVECEXP (pat, 0, 0);
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if (GET_CODE (vec) == SET
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&& XINT (XEXP (vec, 1), 1) == UNSPEC_SET_GOT
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&& REGNO (XEXP (vec, 0)) == REGNO (reg))
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delete_insn (c_insn);
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}
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}
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}
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/* Expand the prologue into a bunch of separate insns. */
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void
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@ -11286,6 +11324,20 @@ ix86_expand_prologue (void)
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if (!sse_registers_saved)
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ix86_emit_save_sse_regs_using_mov (frame.sse_reg_save_offset);
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/* For the mcount profiling on 32 bit PIC mode we need to emit SET_GOT
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in PROLOGUE. */
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if (!TARGET_64BIT && pic_offset_table_rtx && crtl->profile && !flag_fentry)
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{
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rtx pic = gen_rtx_REG (Pmode, REAL_PIC_OFFSET_TABLE_REGNUM);
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insn = emit_insn (gen_set_got (pic));
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RTX_FRAME_RELATED_P (insn) = 1;
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add_reg_note (insn, REG_CFA_FLUSH_QUEUE, NULL_RTX);
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emit_insn (gen_prologue_use (pic));
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/* Deleting already emmitted SET_GOT if exist and allocated to
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REAL_PIC_OFFSET_TABLE_REGNUM. */
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ix86_elim_entry_set_got (pic);
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}
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if (crtl->drap_reg && !crtl->stack_realign_needed)
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{
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/* vDRAP is setup but after reload it turns out stack realign
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@ -1,3 +1,8 @@
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2014-10-31 Evgeny Stupachenko <evstupac@gmail.com>
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PR target/63534
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* gcc.target/i386/mcount_pic.c: New.
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2014-10-31 Evgeny Stupachenko <evstupac@gmail.com>
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* gcc.target/i386/pr23098.c: Remove xfail.
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15
gcc/testsuite/gcc.target/i386/mcount_pic.c
Normal file
15
gcc/testsuite/gcc.target/i386/mcount_pic.c
Normal file
@ -0,0 +1,15 @@
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/* PR target/63534 */
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/* Check correct mcount generation. */
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/* { dg-do run } */
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/* { dg-require-effective-target fpic } */
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/* { dg-require-effective-target ia32 } */
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/* { dg-options "-O2 -fpic -p -save-temps" } */
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int main ()
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{
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return 0;
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}
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/* { dg-final { scan-assembler "mcount" } } */
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/* { dg-final { scan-assembler "get_pc_thunk" } } */
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/* { dg-final { cleanup-saved-temps } } */
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