From ccc12f73ce8e85ec08e13e6e9361803f667a5c82 Mon Sep 17 00:00:00 2001 From: Fred Fish Date: Fri, 20 Feb 1998 05:47:40 +0000 Subject: [PATCH] * config/tc-d30v.c (parallel_ok): For the explicitly parallel case, allow the parallel instructions to modify the same flag bits. PR 14883 --- gas/ChangeLog | 8 ++++++++ gas/config/tc-d30v.c | 44 ++++++++++++++++++++++++++++++++++++-------- 2 files changed, 44 insertions(+), 8 deletions(-) diff --git a/gas/ChangeLog b/gas/ChangeLog index 5b1cad6..095b10f 100644 --- a/gas/ChangeLog +++ b/gas/ChangeLog @@ -1,3 +1,11 @@ +start-sanitize-d30v +Tue Feb 17 17:02:15 1998 Fred Fish + + * config/tc-d30v.c (parallel_ok): For the explicitly parallel + case, allow the parallel instructions to modify the same flag + bits. + +end-sanitize-d30v Thu Feb 19 16:08:15 1998 Richard Henderson * listing.c (list_symbol_table): Categorize symbols by diff --git a/gas/config/tc-d30v.c b/gas/config/tc-d30v.c index f37ae4d..1b217b9 100644 --- a/gas/config/tc-d30v.c +++ b/gas/config/tc-d30v.c @@ -1,6 +1,6 @@ /* tc-d30v.c -- Assembler code for the Mitsubishi D30V - Copyright (C) 1997 Free Software Foundation. + Copyright (C) 1997, 1998 Free Software Foundation. This file is part of GAS, the GNU Assembler. @@ -44,9 +44,9 @@ static int Optimizing = 0; typedef enum _exec_type { EXEC_UNKNOWN, /* no order specified */ - EXEC_PARALLEL, /* done in parallel */ - EXEC_SEQ, /* sequential */ - EXEC_REVSEQ /* reverse sequential */ + EXEC_PARALLEL, /* done in parallel (FM=00) */ + EXEC_SEQ, /* sequential (FM=01) */ + EXEC_REVSEQ /* reverse sequential (FM=10) */ } exec_type_enum; /* fixups */ @@ -74,6 +74,15 @@ static Fixups *fixups; int cur_mul32_p = 0; int prev_mul32_p = 0; +/* The flag_explicitly_parallel is true iff the instruction being assembled + has been explicitly written as a parallel short-instruction pair by the + human programmer. It is used in parallel_ok() to distinguish between + those dangerous parallelizations attempted by the human, which are to be + allowed, and those attempted by the assembler, which are not. It is set + from md_assemble(). */ +static int flag_explicitly_parallel = 0; +static int flag_xp_state = 0; + /* Two nops */ #define NOP_LEFT ((long long)NOP << 32) #define NOP_RIGHT ((long long)NOP) @@ -709,6 +718,7 @@ write_2_short (opcode1, insn1, opcode2, insn2, exec_type, fx) break; case EXEC_PARALLEL: /* parallel */ + flag_explicitly_parallel = flag_xp_state; if (! parallel_ok (opcode1, insn1, opcode2, insn2, exec_type)) as_fatal ("Instructions may not be executed in parallel"); else if (opcode1->op->unit == IU) @@ -730,6 +740,7 @@ write_2_short (opcode1, insn1, opcode2, insn2, exec_type, fx) insn = FM00 | (insn1 << 32) | insn2; fx = fx->next; } + flag_explicitly_parallel = 0; break; case EXEC_SEQ: /* sequential */ @@ -1000,8 +1011,20 @@ parallel_ok (op1, insn1, op2, insn2, exec_type) /* If the second instruction depends on the first, we obviously cannot parallelize. Note, the mod flag implies use, so check that as well. */ - if ((mod_reg[0][j] & (mod_reg[1][j] | used_reg[1][j])) != 0) - return 0; + /* If flag_explicitly_parallel is set, then the case of the + second instruction using a register the first instruction + modifies is assumed to be okay; we trust the human. We + don't trust the human if both instructions modify the same + register but we do trust the human if they modify the same + flags. */ + if (flag_explicitly_parallel) + { + if ((j < 2) && (mod_reg[0][j] & mod_reg[1][j]) != 0) + return 0; + } + else + if ((mod_reg[0][j] & (mod_reg[1][j] | used_reg[1][j])) != 0) + return 0; } return 1; @@ -1032,12 +1055,17 @@ md_assemble (str) if ( (prev_insn != -1) && prev_seg && ((prev_seg != now_seg) || (prev_subseg != now_subseg))) d30v_cleanup(); + flag_explicitly_parallel = 0; + flag_xp_state = 0; if (etype == EXEC_UNKNOWN) { /* look for the special multiple instruction separators */ str2 = strstr (str, "||"); if (str2) - extype = EXEC_PARALLEL; + { + extype = EXEC_PARALLEL; + flag_xp_state = 1; + } else { str2 = strstr (str, "->"); @@ -1262,7 +1290,7 @@ do_assemble (str, opcode) break; case 'l': fsize = FORCE_LONG; - default: + break; } name[nlen-2] = 0; } -- 2.7.4