From: Jiong Wang Date: Fri, 27 May 2016 13:05:34 +0000 (+0000) Subject: [AArch64] PR target/63596, honor tree-stdarg analysis result to improve VAARG codegen X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=88e3bdd195b7cc070eb7525c75b748fb55920b2e;p=gcc.git [AArch64] PR target/63596, honor tree-stdarg analysis result to improve VAARG codegen gcc/ PR target/63596 * config/aarch64/aarch64.c (aarch64_expand_builtin_va_start): Honor tree-stdarg analysis results. (aarch64_setup_incoming_varargs): Likewise. gcc/testsuite/ * gcc.target/aarch64/va_arg_1.c: New testcase. * gcc.target/aarch64/va_arg_2.c: Likewise. * gcc.target/aarch64/va_arg_3.c: Likewise. From-SVN: r236819 --- diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 4e9498beb34..55966de4034 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,10 @@ +2016-05-27 Jiong Wang + + PR target/63596 + * config/aarch64/aarch64.c (aarch64_expand_builtin_va_start): Honor + tree-stdarg analysis results. + (aarch64_setup_incoming_varargs): Likewise. + 2016-05-27 Jiong Wang * config/aarch64/aarch64.c (aarch64_build_builtin_va_list): Initialize diff --git a/gcc/config/aarch64/aarch64.c b/gcc/config/aarch64/aarch64.c index abb2b7b2bc2..2315939ebfa 100644 --- a/gcc/config/aarch64/aarch64.c +++ b/gcc/config/aarch64/aarch64.c @@ -9330,7 +9330,7 @@ aarch64_build_builtin_va_list (void) FIELD_DECL, get_identifier ("__vr_offs"), integer_type_node); - /* Tell tree-stdarg pass what's our internal offset fields. + /* Tell tree-stdarg pass about our internal offset fields. NOTE: va_list_gpr/fpr_counter_field are only used for tree comparision purpose to identify whether the code is updating va_list internal offset fields through irregular way. */ @@ -9369,15 +9369,17 @@ aarch64_expand_builtin_va_start (tree valist, rtx nextarg ATTRIBUTE_UNUSED) tree f_stack, f_grtop, f_vrtop, f_groff, f_vroff; tree stack, grtop, vrtop, groff, vroff; tree t; - int gr_save_area_size; - int vr_save_area_size; + int gr_save_area_size = cfun->va_list_gpr_size; + int vr_save_area_size = cfun->va_list_fpr_size; int vr_offset; cum = &crtl->args.info; - gr_save_area_size - = (NUM_ARG_REGS - cum->aapcs_ncrn) * UNITS_PER_WORD; - vr_save_area_size - = (NUM_FP_ARG_REGS - cum->aapcs_nvrn) * UNITS_PER_VREG; + if (cfun->va_list_gpr_size) + gr_save_area_size = MIN ((NUM_ARG_REGS - cum->aapcs_ncrn) * UNITS_PER_WORD, + cfun->va_list_gpr_size); + if (cfun->va_list_fpr_size) + vr_save_area_size = MIN ((NUM_FP_ARG_REGS - cum->aapcs_nvrn) + * UNITS_PER_VREG, cfun->va_list_fpr_size); if (!TARGET_FLOAT) { @@ -9711,7 +9713,8 @@ aarch64_setup_incoming_varargs (cumulative_args_t cum_v, machine_mode mode, { CUMULATIVE_ARGS *cum = get_cumulative_args (cum_v); CUMULATIVE_ARGS local_cum; - int gr_saved, vr_saved; + int gr_saved = cfun->va_list_gpr_size; + int vr_saved = cfun->va_list_fpr_size; /* The caller has advanced CUM up to, but not beyond, the last named argument. Advance a local copy of CUM past the last "real" named @@ -9719,9 +9722,14 @@ aarch64_setup_incoming_varargs (cumulative_args_t cum_v, machine_mode mode, local_cum = *cum; aarch64_function_arg_advance (pack_cumulative_args(&local_cum), mode, type, true); - /* Found out how many registers we need to save. */ - gr_saved = NUM_ARG_REGS - local_cum.aapcs_ncrn; - vr_saved = NUM_FP_ARG_REGS - local_cum.aapcs_nvrn; + /* Found out how many registers we need to save. + Honor tree-stdvar analysis results. */ + if (cfun->va_list_gpr_size) + gr_saved = MIN (NUM_ARG_REGS - local_cum.aapcs_ncrn, + cfun->va_list_gpr_size / UNITS_PER_WORD); + if (cfun->va_list_fpr_size) + vr_saved = MIN (NUM_FP_ARG_REGS - local_cum.aapcs_nvrn, + cfun->va_list_fpr_size / UNITS_PER_VREG); if (!TARGET_FLOAT) { @@ -9749,7 +9757,7 @@ aarch64_setup_incoming_varargs (cumulative_args_t cum_v, machine_mode mode, /* We can't use move_block_from_reg, because it will use the wrong mode, storing D regs only. */ machine_mode mode = TImode; - int off, i; + int off, i, vr_start; /* Set OFF to the offset from virtual_incoming_args_rtx of the first vector register. The VR save area lies below @@ -9758,14 +9766,15 @@ aarch64_setup_incoming_varargs (cumulative_args_t cum_v, machine_mode mode, STACK_BOUNDARY / BITS_PER_UNIT); off -= vr_saved * UNITS_PER_VREG; - for (i = local_cum.aapcs_nvrn; i < NUM_FP_ARG_REGS; ++i) + vr_start = V0_REGNUM + local_cum.aapcs_nvrn; + for (i = 0; i < vr_saved; ++i) { rtx ptr, mem; ptr = plus_constant (Pmode, virtual_incoming_args_rtx, off); mem = gen_frame_mem (mode, ptr); set_mem_alias_set (mem, get_varargs_alias_set ()); - aarch64_emit_move (mem, gen_rtx_REG (mode, V0_REGNUM + i)); + aarch64_emit_move (mem, gen_rtx_REG (mode, vr_start + i)); off += UNITS_PER_VREG; } } diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog index dece85ffe4e..70b372510a9 100644 --- a/gcc/testsuite/ChangeLog +++ b/gcc/testsuite/ChangeLog @@ -1,3 +1,10 @@ +2016-05-27 Jiong Wang + + PR target/63596 + * gcc.target/aarch64/va_arg_1.c: New testcase. + * gcc.target/aarch64/va_arg_2.c: Likewise. + * gcc.target/aarch64/va_arg_3.c: Likewise. + 2016-05-27 Jiong Wang * gcc.dg/tree-ssa/stdarg-2.c: Enable all testcases for AArch64. diff --git a/gcc/testsuite/gcc.target/aarch64/va_arg_1.c b/gcc/testsuite/gcc.target/aarch64/va_arg_1.c new file mode 100644 index 00000000000..e8e3cdac513 --- /dev/null +++ b/gcc/testsuite/gcc.target/aarch64/va_arg_1.c @@ -0,0 +1,11 @@ +/* { dg-do compile } */ +/* { dg-options "-O2 --save-temps" } */ + +int +f (int a, ...) +{ + /* { dg-final { scan-assembler-not "str" } } */ + return a; +} + +/* { dg-final { cleanup-saved-temps } } */ diff --git a/gcc/testsuite/gcc.target/aarch64/va_arg_2.c b/gcc/testsuite/gcc.target/aarch64/va_arg_2.c new file mode 100644 index 00000000000..f5c46cbd67f --- /dev/null +++ b/gcc/testsuite/gcc.target/aarch64/va_arg_2.c @@ -0,0 +1,18 @@ +/* { dg-do compile } */ +/* { dg-options "-O2 --save-temps" } */ + +int +foo (char *fmt, ...) +{ + int d; + __builtin_va_list ap; + + __builtin_va_start (ap, fmt); + d = __builtin_va_arg (ap, int); + __builtin_va_end (ap); + + /* { dg-final { scan-assembler-not "x7" } } */ + return d; +} + +/* { dg-final { cleanup-saved-temps } } */ diff --git a/gcc/testsuite/gcc.target/aarch64/va_arg_3.c b/gcc/testsuite/gcc.target/aarch64/va_arg_3.c new file mode 100644 index 00000000000..7f7601a8070 --- /dev/null +++ b/gcc/testsuite/gcc.target/aarch64/va_arg_3.c @@ -0,0 +1,26 @@ +/* { dg-do compile } */ +/* { dg-options "-O2 --save-temps" } */ + +int d2i (double a); + +int +foo (char *fmt, ...) +{ + int d, e; + double f, g; + __builtin_va_list ap; + + __builtin_va_start (ap, fmt); + d = __builtin_va_arg (ap, int); + f = __builtin_va_arg (ap, double); + g = __builtin_va_arg (ap, double); + d += d2i (f); + d += d2i (g); + __builtin_va_end (ap); + + /* { dg-final { scan-assembler-not "x7" } } */ + /* { dg-final { scan-assembler-not "q7" } } */ + return d; +} + +/* { dg-final { cleanup-saved-temps } } */