From: Segher Boessenkool Date: Fri, 2 Oct 2015 01:29:26 +0000 (+0200) Subject: rs6000: Add "cannot_copy" attribute, use it (PR67788, PR67789) X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=636172b5bebed879968b5a5b3e6fa25c718d53b7;p=gcc.git rs6000: Add "cannot_copy" attribute, use it (PR67788, PR67789) After the shrink-wrapping patches the prologue will often be pushed "deeper" into the function, which in turn means the software trace cache pass will more often want to duplicate the basic block containing the prologue. This caused failures for 32-bit SVR4 with -msecure-plt PIC. This configuration uses the load_toc_v4_PIC_1 instruction, which creates assembler labels without using the normal machinery for that. If now the compiler decides to duplicate the insn, it will emit the same label twice. Boom. It isn't so easy to fix this to use labels the compiler knows about (let alone test that properly). Instead, this patch wires up a "cannot_copy" attribute to be used by TARGET_CANNOT_COPY_P, and sets that attribute on these insns we do not want copied. 2015-10-01 Segher Boessenkool PR target/67788 PR target/67789 * config/rs6000/rs6000.c (TARGET_CANNOT_COPY_INSN_P): New. (rs6000_cannot_copy_insn_p): New function. * config/rs6000/rs6000.md (cannot_copy): New attribute. (load_toc_v4_PIC_1_normal): Set cannot_copy. (load_toc_v4_PIC_1_476): Ditto. gcc/testsuite/ PR target/67788 PR target/67789 * gcc.target/powerpc/pr67789.c: New testcase. From-SVN: r228366 --- diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 03671ceaae7..bec087b4e48 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,13 @@ +2015-10-01 Segher Boessenkool + + PR target/67788 + PR target/67789 + * config/rs6000/rs6000.c (TARGET_CANNOT_COPY_INSN_P): New. + (rs6000_cannot_copy_insn_p): New function. + * config/rs6000/rs6000.md (cannot_copy): New attribute. + (load_toc_v4_PIC_1_normal): Set cannot_copy. + (load_toc_v4_PIC_1_476): Ditto. + 2015-10-01 Aditya Kumar * graphite-scop-detection.c (struct sese_l): New conversion constructor diff --git a/gcc/config/rs6000/rs6000.c b/gcc/config/rs6000/rs6000.c index 023f6223582..e4082959992 100644 --- a/gcc/config/rs6000/rs6000.c +++ b/gcc/config/rs6000/rs6000.c @@ -1513,6 +1513,8 @@ static const struct attribute_spec rs6000_attribute_table[] = #define TARGET_REGISTER_MOVE_COST rs6000_register_move_cost #undef TARGET_MEMORY_MOVE_COST #define TARGET_MEMORY_MOVE_COST rs6000_memory_move_cost +#undef TARGET_CANNOT_COPY_INSN_P +#define TARGET_CANNOT_COPY_INSN_P rs6000_cannot_copy_insn_p #undef TARGET_RTX_COSTS #define TARGET_RTX_COSTS rs6000_rtx_costs #undef TARGET_ADDRESS_COST @@ -31267,6 +31269,15 @@ rs6000_xcoff_encode_section_info (tree decl, rtx rtl, int first) #endif /* HAVE_AS_TLS */ #endif /* TARGET_XCOFF */ +/* Return true if INSN should not be copied. */ + +static bool +rs6000_cannot_copy_insn_p (rtx_insn *insn) +{ + return recog_memoized (insn) >= 0 + && get_attr_cannot_copy (insn); +} + /* Compute a (partial) cost for rtx X. Return true if the complete cost has been computed, and false if subexpressions should be scanned. In either case, *TOTAL contains the cost result. */ diff --git a/gcc/config/rs6000/rs6000.md b/gcc/config/rs6000/rs6000.md index cfdb286a2cb..8c53c40aba7 100644 --- a/gcc/config/rs6000/rs6000.md +++ b/gcc/config/rs6000/rs6000.md @@ -226,6 +226,9 @@ (const_string "no")) (const_string "no"))) +;; Is copying of this instruction disallowed? +(define_attr "cannot_copy" "no,yes" (const_string "no")) + ;; Define floating point instruction sub-types for use with Xfpu.md (define_attr "fp_type" "fp_default,fp_addsub_s,fp_addsub_d,fp_mul_s,fp_mul_d,fp_div_s,fp_div_d,fp_maddsub_s,fp_maddsub_d,fp_sqrt_s,fp_sqrt_d" (const_string "fp_default")) @@ -9130,7 +9133,8 @@ && (flag_pic == 2 || (flag_pic && TARGET_SECURE_PLT))" "bcl 20,31,%0\\n%0:" [(set_attr "type" "branch") - (set_attr "length" "4")]) + (set_attr "length" "4") + (set_attr "cannot_copy" "yes")]) (define_insn "load_toc_v4_PIC_1_476" [(set (reg:SI LR_REGNO) @@ -9148,7 +9152,8 @@ return templ; }" [(set_attr "type" "branch") - (set_attr "length" "4")]) + (set_attr "length" "4") + (set_attr "cannot_copy" "yes")]) (define_expand "load_toc_v4_PIC_1b" [(parallel [(set (reg:SI LR_REGNO) diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog index f56366a2837..3df0caa811f 100644 --- a/gcc/testsuite/ChangeLog +++ b/gcc/testsuite/ChangeLog @@ -1,3 +1,9 @@ +2015-10-01 Segher Boessenkool + + PR target/67788 + PR target/67789 + * gcc.target/powerpc/pr67789.c: New testcase. + 2015-10-01 Steven G. Kargl PR fortran.67802 diff --git a/gcc/testsuite/gcc.target/powerpc/pr67789.c b/gcc/testsuite/gcc.target/powerpc/pr67789.c new file mode 100644 index 00000000000..d1bd0479cca --- /dev/null +++ b/gcc/testsuite/gcc.target/powerpc/pr67789.c @@ -0,0 +1,39 @@ +/* { dg-do assemble } */ +/* { dg-options "-O2 -msecure-plt -fPIC" } */ + +#define FE_TONEAREST 0 +#define FE_UPWARD 1 +#define FE_DOWNWARD 2 +#define FE_TOWARDZERO 3 + +extern int fesetround(int); + +void +set_fpu_rounding_mode (int mode) +{ + int rnd_mode; + + switch (mode) + { + case 2: + rnd_mode = FE_TONEAREST; + break; + + case 4: + rnd_mode = FE_UPWARD; + break; + + case 1: + rnd_mode = FE_DOWNWARD; + break; + + case 3: + rnd_mode = FE_TOWARDZERO; + break; + + default: + return; + } + + fesetround (rnd_mode); +}