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gcc48-bnc955382.patch
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File gcc48-bnc955382.patch of Package gcc48.10128
Backport from mainline 2015-10-14 Peter Bergner <bergner@vnet.ibm.com> Torvald Riegel <triegel@redhat.com> PR target/67281 * config/rs6000/htm.md (UNSPEC_HTM_FENCE): New. (tabort, tabort<wd>c, tabort<wd>ci, tbegin, tcheck, tend, trechkpt, treclaim, tsr, ttest): Rename define_insns from this... (*tabort, *tabort<wd>c, *tabort<wd>ci, *tbegin, *tcheck, *tend, *trechkpt, *treclaim, *tsr, *ttest): ...to this. Add memory barrier. (tabort, tabort<wd>c, tabort<wd>ci, tbegin, tcheck, tend, trechkpt, treclaim, tsr, ttest): New define_expands. * config/rs6000/rs6000-c.c (rs6000_target_modify_macros): Define __TM_FENCE__ for htm. * doc/extend.texi: Update documentation for htm builtins. Backport from mainline: 2015-08-03 Peter Bergner <bergner@vnet.ibm.com> * config/rs6000/htm.md (tabort.): Restrict the source operand to using a base register. Index: gcc/config/rs6000/htm.md =================================================================== --- gcc/config/rs6000/htm.md (revision 228847) +++ gcc/config/rs6000/htm.md (working copy) @@ -27,6 +27,14 @@ ]) ;; +;; UNSPEC usage +;; + +(define_c_enum "unspec" + [UNSPEC_HTM_FENCE + ]) + +;; ;; UNSPEC_VOLATILE usage ;; @@ -45,96 +53,223 @@ UNSPECV_HTM_MTSPR ]) +(define_expand "tabort" + [(parallel + [(set (match_operand:CC 1 "cc_reg_operand" "=x") + (unspec_volatile:CC [(match_operand:SI 0 "base_reg_operand" "b")] + UNSPECV_HTM_TABORT)) + (set (match_dup 2) (unspec:BLK [(match_dup 2)] UNSPEC_HTM_FENCE))])] + "TARGET_HTM" +{ + operands[2] = gen_rtx_MEM (BLKmode, gen_rtx_SCRATCH (Pmode)); + MEM_VOLATILE_P (operands[2]) = 1; +}) -(define_insn "tabort" +(define_insn "*tabort" [(set (match_operand:CC 1 "cc_reg_operand" "=x") - (unspec_volatile:CC [(match_operand:SI 0 "gpc_reg_operand" "r")] - UNSPECV_HTM_TABORT))] + (unspec_volatile:CC [(match_operand:SI 0 "base_reg_operand" "b")] + UNSPECV_HTM_TABORT)) + (set (match_operand:BLK 2) (unspec:BLK [(match_dup 2)] UNSPEC_HTM_FENCE))] "TARGET_HTM" "tabort. %0" [(set_attr "type" "htm") (set_attr "length" "4")]) -(define_insn "tabort<wd>c" +(define_expand "tabort<wd>c" + [(parallel + [(set (match_operand:CC 3 "cc_reg_operand" "=x") + (unspec_volatile:CC [(match_operand 0 "u5bit_cint_operand" "n") + (match_operand:GPR 1 "gpc_reg_operand" "r") + (match_operand:GPR 2 "gpc_reg_operand" "r")] + UNSPECV_HTM_TABORTXC)) + (set (match_dup 4) (unspec:BLK [(match_dup 4)] UNSPEC_HTM_FENCE))])] + "TARGET_HTM" +{ + operands[4] = gen_rtx_MEM (BLKmode, gen_rtx_SCRATCH (Pmode)); + MEM_VOLATILE_P (operands[4]) = 1; +}) + +(define_insn "*tabort<wd>c" [(set (match_operand:CC 3 "cc_reg_operand" "=x") (unspec_volatile:CC [(match_operand 0 "u5bit_cint_operand" "n") (match_operand:GPR 1 "gpc_reg_operand" "r") (match_operand:GPR 2 "gpc_reg_operand" "r")] - UNSPECV_HTM_TABORTXC))] + UNSPECV_HTM_TABORTXC)) + (set (match_operand:BLK 4) (unspec:BLK [(match_dup 4)] UNSPEC_HTM_FENCE))] "TARGET_HTM" "tabort<wd>c. %0,%1,%2" [(set_attr "type" "htm") (set_attr "length" "4")]) -(define_insn "tabort<wd>ci" +(define_expand "tabort<wd>ci" + [(parallel + [(set (match_operand:CC 3 "cc_reg_operand" "=x") + (unspec_volatile:CC [(match_operand 0 "u5bit_cint_operand" "n") + (match_operand:GPR 1 "gpc_reg_operand" "r") + (match_operand 2 "s5bit_cint_operand" "n")] + UNSPECV_HTM_TABORTXCI)) + (set (match_dup 4) (unspec:BLK [(match_dup 4)] UNSPEC_HTM_FENCE))])] + "TARGET_HTM" +{ + operands[4] = gen_rtx_MEM (BLKmode, gen_rtx_SCRATCH (Pmode)); + MEM_VOLATILE_P (operands[4]) = 1; +}) + +(define_insn "*tabort<wd>ci" [(set (match_operand:CC 3 "cc_reg_operand" "=x") (unspec_volatile:CC [(match_operand 0 "u5bit_cint_operand" "n") (match_operand:GPR 1 "gpc_reg_operand" "r") (match_operand 2 "s5bit_cint_operand" "n")] - UNSPECV_HTM_TABORTXCI))] + UNSPECV_HTM_TABORTXCI)) + (set (match_operand:BLK 4) (unspec:BLK [(match_dup 4)] UNSPEC_HTM_FENCE))] "TARGET_HTM" "tabort<wd>ci. %0,%1,%2" [(set_attr "type" "htm") (set_attr "length" "4")]) -(define_insn "tbegin" +(define_expand "tbegin" + [(parallel + [(set (match_operand:CC 1 "cc_reg_operand" "=x") + (unspec_volatile:CC [(match_operand 0 "const_0_to_1_operand" "n")] + UNSPECV_HTM_TBEGIN)) + (set (match_dup 2) (unspec:BLK [(match_dup 2)] UNSPEC_HTM_FENCE))])] + "TARGET_HTM" +{ + operands[2] = gen_rtx_MEM (BLKmode, gen_rtx_SCRATCH (Pmode)); + MEM_VOLATILE_P (operands[2]) = 1; +}) + +(define_insn "*tbegin" [(set (match_operand:CC 1 "cc_reg_operand" "=x") (unspec_volatile:CC [(match_operand 0 "const_0_to_1_operand" "n")] - UNSPECV_HTM_TBEGIN))] + UNSPECV_HTM_TBEGIN)) + (set (match_operand:BLK 2) (unspec:BLK [(match_dup 2)] UNSPEC_HTM_FENCE))] "TARGET_HTM" "tbegin. %0" [(set_attr "type" "htm") (set_attr "length" "4")]) -(define_insn "tcheck" +(define_expand "tcheck" + [(parallel + [(set (match_operand:CC 0 "cc_reg_operand" "=y") + (unspec_volatile:CC [(const_int 0)] UNSPECV_HTM_TCHECK)) + (set (match_dup 1) (unspec:BLK [(match_dup 1)] UNSPEC_HTM_FENCE))])] + "TARGET_HTM" +{ + operands[1] = gen_rtx_MEM (BLKmode, gen_rtx_SCRATCH (Pmode)); + MEM_VOLATILE_P (operands[1]) = 1; +}) + +(define_insn "*tcheck" [(set (match_operand:CC 0 "cc_reg_operand" "=y") - (unspec_volatile:CC [(const_int 0)] - UNSPECV_HTM_TCHECK))] + (unspec_volatile:CC [(const_int 0)] UNSPECV_HTM_TCHECK)) + (set (match_operand:BLK 1) (unspec:BLK [(match_dup 1)] UNSPEC_HTM_FENCE))] "TARGET_HTM" "tcheck %0" [(set_attr "type" "htm") (set_attr "length" "4")]) -(define_insn "tend" +(define_expand "tend" + [(parallel + [(set (match_operand:CC 1 "cc_reg_operand" "=x") + (unspec_volatile:CC [(match_operand 0 "const_0_to_1_operand" "n")] + UNSPECV_HTM_TEND)) + (set (match_dup 2) (unspec:BLK [(match_dup 2)] UNSPEC_HTM_FENCE))])] + "TARGET_HTM" +{ + operands[2] = gen_rtx_MEM (BLKmode, gen_rtx_SCRATCH (Pmode)); + MEM_VOLATILE_P (operands[2]) = 1; +}) + +(define_insn "*tend" [(set (match_operand:CC 1 "cc_reg_operand" "=x") (unspec_volatile:CC [(match_operand 0 "const_0_to_1_operand" "n")] - UNSPECV_HTM_TEND))] + UNSPECV_HTM_TEND)) + (set (match_operand:BLK 2) (unspec:BLK [(match_dup 2)] UNSPEC_HTM_FENCE))] "TARGET_HTM" "tend. %0" [(set_attr "type" "htm") (set_attr "length" "4")]) -(define_insn "trechkpt" +(define_expand "trechkpt" + [(parallel + [(set (match_operand:CC 0 "cc_reg_operand" "=x") + (unspec_volatile:CC [(const_int 0)] UNSPECV_HTM_TRECHKPT)) + (set (match_dup 1) (unspec:BLK [(match_dup 1)] UNSPEC_HTM_FENCE))])] + "TARGET_HTM" +{ + operands[1] = gen_rtx_MEM (BLKmode, gen_rtx_SCRATCH (Pmode)); + MEM_VOLATILE_P (operands[1]) = 1; +}) + +(define_insn "*trechkpt" [(set (match_operand:CC 0 "cc_reg_operand" "=x") - (unspec_volatile:CC [(const_int 0)] - UNSPECV_HTM_TRECHKPT))] + (unspec_volatile:CC [(const_int 0)] UNSPECV_HTM_TRECHKPT)) + (set (match_operand:BLK 1) (unspec:BLK [(match_dup 1)] UNSPEC_HTM_FENCE))] "TARGET_HTM" "trechkpt." [(set_attr "type" "htm") (set_attr "length" "4")]) -(define_insn "treclaim" +(define_expand "treclaim" + [(parallel + [(set (match_operand:CC 1 "cc_reg_operand" "=x") + (unspec_volatile:CC [(match_operand:SI 0 "gpc_reg_operand" "r")] + UNSPECV_HTM_TRECLAIM)) + (set (match_dup 2) (unspec:BLK [(match_dup 2)] UNSPEC_HTM_FENCE))])] + "TARGET_HTM" +{ + operands[2] = gen_rtx_MEM (BLKmode, gen_rtx_SCRATCH (Pmode)); + MEM_VOLATILE_P (operands[2]) = 1; +}) + +(define_insn "*treclaim" [(set (match_operand:CC 1 "cc_reg_operand" "=x") (unspec_volatile:CC [(match_operand:SI 0 "gpc_reg_operand" "r")] - UNSPECV_HTM_TRECLAIM))] + UNSPECV_HTM_TRECLAIM)) + (set (match_operand:BLK 2) (unspec:BLK [(match_dup 2)] UNSPEC_HTM_FENCE))] "TARGET_HTM" "treclaim. %0" [(set_attr "type" "htm") (set_attr "length" "4")]) -(define_insn "tsr" +(define_expand "tsr" + [(parallel + [(set (match_operand:CC 1 "cc_reg_operand" "=x") + (unspec_volatile:CC [(match_operand 0 "const_0_to_1_operand" "n")] + UNSPECV_HTM_TSR)) + (set (match_dup 2) (unspec:BLK [(match_dup 2)] UNSPEC_HTM_FENCE))])] + "TARGET_HTM" +{ + operands[2] = gen_rtx_MEM (BLKmode, gen_rtx_SCRATCH (Pmode)); + MEM_VOLATILE_P (operands[2]) = 1; +}) + +(define_insn "*tsr" [(set (match_operand:CC 1 "cc_reg_operand" "=x") (unspec_volatile:CC [(match_operand 0 "const_0_to_1_operand" "n")] - UNSPECV_HTM_TSR))] + UNSPECV_HTM_TSR)) + (set (match_operand:BLK 2) (unspec:BLK [(match_dup 2)] UNSPEC_HTM_FENCE))] "TARGET_HTM" "tsr. %0" [(set_attr "type" "htm") (set_attr "length" "4")]) -(define_insn "ttest" +(define_expand "ttest" + [(parallel + [(set (match_operand:CC 0 "cc_reg_operand" "=x") + (unspec_volatile:CC [(const_int 0)] UNSPECV_HTM_TTEST)) + (set (match_dup 1) (unspec:BLK [(match_dup 1)] UNSPEC_HTM_FENCE))])] + "TARGET_HTM" +{ + operands[1] = gen_rtx_MEM (BLKmode, gen_rtx_SCRATCH (Pmode)); + MEM_VOLATILE_P (operands[1]) = 1; +}) + +(define_insn "*ttest" [(set (match_operand:CC 0 "cc_reg_operand" "=x") - (unspec_volatile:CC [(const_int 0)] - UNSPECV_HTM_TTEST))] + (unspec_volatile:CC [(const_int 0)] UNSPECV_HTM_TTEST)) + (set (match_operand:BLK 1) (unspec:BLK [(match_dup 1)] UNSPEC_HTM_FENCE))] "TARGET_HTM" "tabortwci. 0,1,0" [(set_attr "type" "htm") Index: gcc/config/rs6000/rs6000-c.c =================================================================== --- gcc/config/rs6000/rs6000-c.c (revision 228847) +++ gcc/config/rs6000/rs6000-c.c (working copy) @@ -351,7 +351,11 @@ if ((flags & OPTION_MASK_VSX) != 0) rs6000_define_or_undefine_macro (define_p, "__VSX__"); if ((flags & OPTION_MASK_HTM) != 0) - rs6000_define_or_undefine_macro (define_p, "__HTM__"); + { + rs6000_define_or_undefine_macro (define_p, "__HTM__"); + /* Tell the user that our HTM insn patterns act as memory barriers. */ + rs6000_define_or_undefine_macro (define_p, "__TM_FENCE__"); + } if ((flags & OPTION_MASK_P8_VECTOR) != 0) rs6000_define_or_undefine_macro (define_p, "__POWER8_VECTOR__"); if ((flags & OPTION_MASK_QUAD_MEMORY) != 0) Index: gcc/doc/extend.texi =================================================================== --- gcc/doc/extend.texi (revision 228847) +++ gcc/doc/extend.texi (working copy) @@ -14573,6 +14573,28 @@ unsigned int __builtin_tsuspend (void) @end smallexample +Note that the semantics of the above HTM builtins are required to mimic +the locking semantics used for critical sections. Builtins that are used +to create a new transaction or restart a suspended transaction must have +lock acquisition like semantics while those builtins that end or suspend a +transaction must have lock release like semantics. Specifically, this must +mimic lock semantics as specified by C++11, for example: Lock acquisition is +as-if an execution of __atomic_exchange_n(&globallock,1,__ATOMIC_ACQUIRE) +that returns 0, and lock release is as-if an execution of +__atomic_store(&globallock,0,__ATOMIC_RELEASE), with globallock being an +implicit implementation-defined lock used for all transactions. The HTM +instructions associated with with the builtins inherently provide the +correct acquisition and release hardware barriers required. However, +the compiler must also be prohibited from moving loads and stores across +the builtins in a way that would violate their semantics. This has been +accomplished by adding memory barriers to the associated HTM instructions +(which is a conservative approach to provide acquire and release semantics). +Earlier versions of the compiler did not treat the HTM instructions as +memory barriers. A @code{__TM_FENCE__} macro has been added, which can +be used to determine whether the current compiler treats HTM instructions +as memory barriers or not. This allows the user to explicitly add memory +barriers to their code when using an older version of the compiler. + The following set of built-in functions are available to gain access to the HTM specific special purpose registers. Index: gcc/testsuite/gcc.target/powerpc/htm-tabort-no-r0.c =================================================================== --- gcc/testsuite/gcc.target/powerpc/htm-tabort-no-r0.c (revision 0) +++ gcc/testsuite/gcc.target/powerpc/htm-tabort-no-r0.c (working copy) @@ -0,0 +1,12 @@ +/* { dg-do compile { target { powerpc*-*-* } } } */ +/* { dg-skip-if "" { powerpc*-*-darwin* } { "*" } { "" } } */ +/* { dg-require-effective-target powerpc_htm_ok } */ +/* { dg-options "-O2 -mhtm -ffixed-r3 -ffixed-r4 -ffixed-r5 -ffixed-r6 -ffixed-r7 -ffixed-r8 -ffixed-r9 -ffixed-r10 -ffixed-r11 -ffixed-r12" } */ + +/* { dg-final { scan-assembler-not "tabort\\.\[ \t\]0" } } */ + +int +foo (void) +{ + return __builtin_tabort (10); +}
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