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This patch adds Hardware Transaction Memory (HTM) support supported by ISA 2.07 (POWER8). The intrinsic support is based on GCC one [1], but currently only the 'PowerPC HTM Low Level Built-in Function' are implemented. The HTM instructions follows the RC ones and the transaction initiation result is set on RC0 (with exception of tcheck). Currently approach is to create a register copy from CR0 to GPR and comapring. Although this is suboptimal, since the branch could be taken directly by comparing the CR0 value, it generates code correctly on both test and branch and just return value. A possible future optimization could be elimitate the MFCR instruction to branch directly. The HTM usage requires a recently newer kernel with PPC HTM enabled. Tested on powerpc64 and powerpc64le. This is send along a clang patch to enabled the builtins and option switch. [1] https://gcc.gnu.org/onlinedocs/gcc/PowerPC-Hardware-Transactional-Memory-Built-in-Functions.html Phabricator Review: http://reviews.llvm.org/D8247 llvm-svn: 233204
173 lines
5.1 KiB
TableGen
173 lines
5.1 KiB
TableGen
//===-- PPCInstrHTM.td - The PowerPC Hardware Transactional Memory -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file describes the Hardware Transactional Memory extension to the
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// PowerPC instruction set.
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//
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//===----------------------------------------------------------------------===//
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def HasHTM : Predicate<"PPCSubTarget->hasHTM()">;
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def HTM_get_imm : SDNodeXForm<imm, [{
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return getI32Imm (N->getZExtValue());
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}]>;
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let hasSideEffects = 1, usesCustomInserter = 1 in {
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def TCHECK_RET : Pseudo<(outs crrc:$out), (ins), "#TCHECK_RET", []>;
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}
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let Predicates = [HasHTM] in {
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def TBEGIN : XForm_htm0 <31, 654,
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(outs crrc0:$ret), (ins u1imm:$R), "tbegin. $R", IIC_SprMTSPR, []>;
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def TEND : XForm_htm1 <31, 686,
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(outs crrc0:$ret), (ins u1imm:$A), "tend. $A", IIC_SprMTSPR, []>;
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def TABORT : XForm_base_r3xo <31, 910,
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(outs crrc0:$ret), (ins gprc:$A), "tabort. $A", IIC_SprMTSPR,
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[]>, isDOT {
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let RST = 0;
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let B = 0;
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}
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def TABORTWC : XForm_base_r3xo <31, 782,
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(outs crrc0:$ret), (ins u5imm:$RTS, gprc:$A, gprc:$B),
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"tabortwc. $RTS, $A, $B", IIC_SprMTSPR, []>,
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isDOT;
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def TABORTWCI : XForm_base_r3xo <31, 846,
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(outs crrc0:$ret), (ins u5imm:$RTS, gprc:$A, u5imm:$B),
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"tabortwci. $RTS, $A, $B", IIC_SprMTSPR, []>,
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isDOT;
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def TABORTDC : XForm_base_r3xo <31, 814,
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(outs crrc0:$ret), (ins u5imm:$RTS, gprc:$A, gprc:$B),
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"tabortdc. $RTS, $A, $B", IIC_SprMTSPR, []>,
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isDOT;
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def TABORTDCI : XForm_base_r3xo <31, 878,
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(outs crrc0:$ret), (ins u5imm:$RTS, gprc:$A, u5imm:$B),
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"tabortdci. $RTS, $A, $B", IIC_SprMTSPR, []>,
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isDOT;
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def TSR : XForm_htm2 <31, 750,
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(outs crrc0:$ret), (ins u1imm:$L), "tsr. $L", IIC_SprMTSPR, []>,
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isDOT;
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def TCHECK : XForm_htm3 <31, 718,
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(outs), (ins crrc:$BF), "tcheck $BF", IIC_SprMTSPR, []>;
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def TRECLAIM : XForm_base_r3xo <31, 942,
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(outs crrc:$ret), (ins gprc:$A), "treclaim. $A",
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IIC_SprMTSPR, []>,
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isDOT {
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let RST = 0;
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let B = 0;
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}
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def TRECHKPT : XForm_base_r3xo <31, 1006,
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(outs crrc:$ret), (ins), "trechkpt.", IIC_SprMTSPR, []>,
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isDOT {
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let RST = 0;
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let A = 0;
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let B = 0;
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}
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// Builtins
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// All HTM instructions, with the exception of tcheck, set CR0 with the
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// value of the MSR Transaction State (TS) bits that exist before the
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// instruction is executed. For tbegin., the EQ bit in CR0 can be used
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// to determine whether the transaction was successfully started (0) or
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// failed (1). We use an XORI pattern to 'flip' the bit to match the
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// tbegin builtin API which defines a return value of 1 as success.
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def : Pat<(int_ppc_tbegin i32:$R),
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(XORI
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(EXTRACT_SUBREG (
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TBEGIN (HTM_get_imm imm:$R)), sub_eq),
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1)>;
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def : Pat<(int_ppc_tend i32:$R),
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(TEND (HTM_get_imm imm:$R))>;
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def : Pat<(int_ppc_tabort i32:$R),
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(TABORT $R)>;
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def : Pat<(int_ppc_tabortwc i32:$TO, i32:$RA, i32:$RB),
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(TABORTWC (HTM_get_imm imm:$TO), $RA, $RB)>;
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def : Pat<(int_ppc_tabortwci i32:$TO, i32:$RA, i32:$SI),
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(TABORTWCI (HTM_get_imm imm:$TO), $RA, (HTM_get_imm imm:$SI))>;
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def : Pat<(int_ppc_tabortdc i32:$TO, i32:$RA, i32:$RB),
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(TABORTDC (HTM_get_imm imm:$TO), $RA, $RB)>;
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def : Pat<(int_ppc_tabortdci i32:$TO, i32:$RA, i32:$SI),
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(TABORTDCI (HTM_get_imm imm:$TO), $RA, (HTM_get_imm imm:$SI))>;
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def : Pat<(int_ppc_tcheck),
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(TCHECK_RET)>;
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def : Pat<(int_ppc_treclaim i32:$RA),
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(TRECLAIM $RA)>;
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def : Pat<(int_ppc_trechkpt),
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(TRECHKPT)>;
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def : Pat<(int_ppc_tsr i32:$L),
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(TSR (HTM_get_imm imm:$L))>;
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def : Pat<(int_ppc_get_texasr),
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(MFSPR8 130)>;
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def : Pat<(int_ppc_get_texasru),
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(MFSPR8 131)>;
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def : Pat<(int_ppc_get_tfhar),
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(MFSPR8 128)>;
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def : Pat<(int_ppc_get_tfiar),
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(MFSPR8 129)>;
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def : Pat<(int_ppc_set_texasr i64:$V),
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(MTSPR8 130, $V)>;
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def : Pat<(int_ppc_set_texasru i64:$V),
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(MTSPR8 131, $V)>;
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def : Pat<(int_ppc_set_tfhar i64:$V),
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(MTSPR8 128, $V)>;
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def : Pat<(int_ppc_set_tfiar i64:$V),
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(MTSPR8 129, $V)>;
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// Extended mnemonics
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def : Pat<(int_ppc_tendall),
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(TEND 1)>;
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def : Pat<(int_ppc_tresume),
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(TSR 1)>;
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def : Pat<(int_ppc_tsuspend),
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(TSR 0)>;
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def : Pat<(i64 (int_ppc_ttest)),
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(RLDICL (i64 (COPY (TABORTWCI 0, ZERO, 0))), 36, 28)>;
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} // [HasHTM]
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