https://gcc.gnu.org/PR92095 https://bugs.gentoo.org/697708 From 1a839ffee6ffae07948055a81051fad05a8c0b30 Mon Sep 17 00:00:00 2001 From: ebotcazou Date: Fri, 8 Nov 2019 12:33:48 +0000 Subject: [PATCH] PR target/92095 * config/sparc/sparc-protos.h (output_load_pcrel_sym): Declare. * config/sparc/sparc.c (sparc_cannot_force_const_mem): Revert latest change. (got_helper_needed): New static variable. (output_load_pcrel_sym): New function. (get_pc_thunk_name): Remove after inlining... (load_got_register): ...here. Rework the initialization of the GOT register and of the GOT helper. (save_local_or_in_reg_p): Test the REGNO of the GOT register. (sparc_file_end): Test got_helper_needed to decide whether the GOT helper must be emitted. Use output_asm_insn instead of fprintf. (sparc_init_pic_reg): In PIC mode, always initialize the PIC register if optimization is enabled. * config/sparc/sparc.md (load_pcrel_sym): Emit the assembly by calling output_load_pcrel_sym. git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/branches/gcc-9-branch@277967 138bc75d-0d04-0410-961f-82ee72b054a4 --- gcc/config/sparc/sparc-protos.h | 1 + gcc/config/sparc/sparc.c | 121 +++++++++++------- gcc/config/sparc/sparc.md | 5 +- .../gcc.c-torture/compile/20191108-1.c | 14 ++ gcc/testsuite/gcc.target/sparc/overflow-3.c | 2 +- gcc/testsuite/gcc.target/sparc/overflow-4.c | 2 +- gcc/testsuite/gcc.target/sparc/overflow-5.c | 2 +- --- a/gcc/config/sparc/sparc-protos.h +++ b/gcc/config/sparc/sparc-protos.h @@ -69,6 +69,7 @@ extern void sparc_split_reg_mem (rtx, rtx, machine_mode); extern void sparc_split_mem_reg (rtx, rtx, machine_mode); extern int sparc_split_reg_reg_legitimate (rtx, rtx); extern void sparc_split_reg_reg (rtx, rtx, machine_mode); +extern const char *output_load_pcrel_sym (rtx *); extern const char *output_ubranch (rtx, rtx_insn *); extern const char *output_cbranch (rtx, rtx, int, int, int, rtx_insn *); extern const char *output_return (rtx_insn *); --- a/gcc/config/sparc/sparc.c +++ b/gcc/config/sparc/sparc.c @@ -4208,13 +4208,6 @@ eligible_for_sibcall_delay (rtx_insn *trial) static bool sparc_cannot_force_const_mem (machine_mode mode, rtx x) { - /* After IRA has run in PIC mode, it is too late to put anything into the - constant pool if the PIC register hasn't already been initialized. */ - if ((lra_in_progress || reload_in_progress) - && flag_pic - && !crtl->uses_pic_offset_table) - return true; - switch (GET_CODE (x)) { case CONST_INT: @@ -4250,9 +4243,11 @@ sparc_cannot_force_const_mem (machine_mode mode, rtx x) } /* Global Offset Table support. */ -static GTY(()) rtx got_helper_rtx = NULL_RTX; -static GTY(()) rtx got_register_rtx = NULL_RTX; static GTY(()) rtx got_symbol_rtx = NULL_RTX; +static GTY(()) rtx got_register_rtx = NULL_RTX; +static GTY(()) rtx got_helper_rtx = NULL_RTX; + +static GTY(()) bool got_helper_needed = false; /* Return the SYMBOL_REF for the Global Offset Table. */ @@ -4265,27 +4260,6 @@ sparc_got (void) return got_symbol_rtx; } -#ifdef HAVE_GAS_HIDDEN -# define USE_HIDDEN_LINKONCE 1 -#else -# define USE_HIDDEN_LINKONCE 0 -#endif - -static void -get_pc_thunk_name (char name[32], unsigned int regno) -{ - const char *reg_name = reg_names[regno]; - - /* Skip the leading '%' as that cannot be used in a - symbol name. */ - reg_name += 1; - - if (USE_HIDDEN_LINKONCE) - sprintf (name, "__sparc_get_pc_thunk.%s", reg_name); - else - ASM_GENERATE_INTERNAL_LABEL (name, "LADDPC", regno); -} - /* Wrapper around the load_pcrel_sym{si,di} patterns. */ static rtx @@ -4305,30 +4279,78 @@ gen_load_pcrel_sym (rtx op0, rtx op1, rtx op2) return insn; } +/* Output the load_pcrel_sym{si,di} patterns. */ + +const char * +output_load_pcrel_sym (rtx *operands) +{ + if (flag_delayed_branch) + { + output_asm_insn ("sethi\t%%hi(%a1-4), %0", operands); + output_asm_insn ("call\t%a2", operands); + output_asm_insn (" add\t%0, %%lo(%a1+4), %0", operands); + } + else + { + output_asm_insn ("sethi\t%%hi(%a1-8), %0", operands); + output_asm_insn ("add\t%0, %%lo(%a1-4), %0", operands); + output_asm_insn ("call\t%a2", operands); + output_asm_insn (" nop", NULL); + } + + if (operands[2] == got_helper_rtx) + got_helper_needed = true; + + return ""; +} + +#ifdef HAVE_GAS_HIDDEN +# define USE_HIDDEN_LINKONCE 1 +#else +# define USE_HIDDEN_LINKONCE 0 +#endif + /* Emit code to load the GOT register. */ void load_got_register (void) { - if (!got_register_rtx) - got_register_rtx = gen_rtx_REG (Pmode, GLOBAL_OFFSET_TABLE_REGNUM); + rtx insn; if (TARGET_VXWORKS_RTP) - emit_insn (gen_vxworks_load_got ()); + { + if (!got_register_rtx) + got_register_rtx = pic_offset_table_rtx; + + insn = gen_vxworks_load_got (); + } else { + if (!got_register_rtx) + got_register_rtx = gen_rtx_REG (Pmode, GLOBAL_OFFSET_TABLE_REGNUM); + /* The GOT symbol is subject to a PC-relative relocation so we need a helper function to add the PC value and thus get the final value. */ if (!got_helper_rtx) { char name[32]; - get_pc_thunk_name (name, GLOBAL_OFFSET_TABLE_REGNUM); + + /* Skip the leading '%' as that cannot be used in a symbol name. */ + if (USE_HIDDEN_LINKONCE) + sprintf (name, "__sparc_get_pc_thunk.%s", + reg_names[REGNO (got_register_rtx)] + 1); + else + ASM_GENERATE_INTERNAL_LABEL (name, "LADDPC", + REGNO (got_register_rtx)); + got_helper_rtx = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (name)); } - emit_insn (gen_load_pcrel_sym (got_register_rtx, sparc_got (), - got_helper_rtx)); + insn + = gen_load_pcrel_sym (got_register_rtx, sparc_got (), got_helper_rtx); } + + emit_insn (insn); } /* Ensure that we are not using patterns that are not OK with PIC. */ @@ -5493,7 +5515,7 @@ save_local_or_in_reg_p (unsigned int regno, int leaf_function) return true; /* GOT register (%l7) if needed. */ - if (regno == GLOBAL_OFFSET_TABLE_REGNUM && got_register_rtx) + if (got_register_rtx && regno == REGNO (got_register_rtx)) return true; /* If the function accesses prior frames, the frame pointer and the return @@ -12536,10 +12558,9 @@ static void sparc_file_end (void) { /* If we need to emit the special GOT helper function, do so now. */ - if (got_helper_rtx) + if (got_helper_needed) { const char *name = XSTR (got_helper_rtx, 0); - const char *reg_name = reg_names[GLOBAL_OFFSET_TABLE_REGNUM]; #ifdef DWARF2_UNWIND_INFO bool do_cfi; #endif @@ -12576,17 +12597,22 @@ sparc_file_end (void) #ifdef DWARF2_UNWIND_INFO do_cfi = dwarf2out_do_cfi_asm (); if (do_cfi) - fprintf (asm_out_file, "\t.cfi_startproc\n"); + output_asm_insn (".cfi_startproc", NULL); #endif if (flag_delayed_branch) - fprintf (asm_out_file, "\tjmp\t%%o7+8\n\t add\t%%o7, %s, %s\n", - reg_name, reg_name); + { + output_asm_insn ("jmp\t%%o7+8", NULL); + output_asm_insn (" add\t%%o7, %0, %0", &got_register_rtx); + } else - fprintf (asm_out_file, "\tadd\t%%o7, %s, %s\n\tjmp\t%%o7+8\n\t nop\n", - reg_name, reg_name); + { + output_asm_insn ("add\t%%o7, %0, %0", &got_register_rtx); + output_asm_insn ("jmp\t%%o7+8", NULL); + output_asm_insn (" nop", NULL); + } #ifdef DWARF2_UNWIND_INFO if (do_cfi) - fprintf (asm_out_file, "\t.cfi_endproc\n"); + output_asm_insn (".cfi_endproc", NULL); #endif } @@ -13092,7 +13118,10 @@ sparc_init_pic_reg (void) edge entry_edge; rtx_insn *seq; - if (!crtl->uses_pic_offset_table) + /* In PIC mode, we need to always initialize the PIC register if optimization + is enabled, because we are called from IRA and LRA may later force things + to the constant pool for optimization purposes. */ + if (!flag_pic || (!crtl->uses_pic_offset_table && !optimize)) return; start_sequence (); --- a/gcc/config/sparc/sparc.md +++ b/gcc/config/sparc/sparc.md @@ -1604,10 +1604,7 @@ (clobber (reg:P O7_REG))] "REGNO (operands[0]) == INTVAL (operands[3])" { - if (flag_delayed_branch) - return "sethi\t%%hi(%a1-4), %0\n\tcall\t%a2\n\t add\t%0, %%lo(%a1+4), %0"; - else - return "sethi\t%%hi(%a1-8), %0\n\tadd\t%0, %%lo(%a1-4), %0\n\tcall\t%a2\n\t nop"; + return output_load_pcrel_sym (operands); } [(set (attr "type") (const_string "multi")) (set (attr "length") --- /dev/null +++ b/gcc/testsuite/gcc.c-torture/compile/20191108-1.c @@ -0,0 +1,14 @@ +/* PR target/92095 */ +/* Testcase by Sergei Trofimovich */ + +typedef union { + double a; + int b[2]; +} c; + +double d(int e) +{ + c f; + (&f)->b[0] = 15728640; + return e ? -(&f)->a : (&f)->a; +} --- a/gcc/testsuite/gcc.target/sparc/overflow-3.c +++ b/gcc/testsuite/gcc.target/sparc/overflow-3.c @@ -1,6 +1,6 @@ /* { dg-do compile } */ /* { dg-require-effective-target lp64 } */ -/* { dg-options "-O" } */ +/* { dg-options "-O -fno-pie" } */ #include #include --- a/gcc/testsuite/gcc.target/sparc/overflow-4.c +++ b/gcc/testsuite/gcc.target/sparc/overflow-4.c @@ -1,6 +1,6 @@ /* { dg-do compile } */ /* { dg-require-effective-target lp64 } */ -/* { dg-options "-O -mno-vis3 -mno-vis4" } */ +/* { dg-options "-O -fno-pie -mno-vis3 -mno-vis4" } */ #include #include --- a/gcc/testsuite/gcc.target/sparc/overflow-5.c +++ b/gcc/testsuite/gcc.target/sparc/overflow-5.c @@ -1,6 +1,6 @@ /* { dg-do compile } */ /* { dg-require-effective-target lp64 } */ -/* { dg-options "-O -mvis3" } */ +/* { dg-options "-O -fno-pie -mvis3" } */ #include #include -- 2.24.0