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author | Bernd Schmidt <bernds@cygnus.co.uk> | 1999-09-23 11:34:49 +0000 |
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committer | Bernd Schmidt <crux@gcc.gnu.org> | 1999-09-23 11:34:49 +0000 |
commit | 1c0290eaac40944ba6baed8323b74f42ab7f05c9 (patch) | |
tree | f3957a52a53f08158be8aba1c10f20bd084118d7 /gcc/optabs.c | |
parent | 708d3415cfbb4258becce97364825ee8a6c2b957 (diff) | |
download | gcc-1c0290eaac40944ba6baed8323b74f42ab7f05c9.zip gcc-1c0290eaac40944ba6baed8323b74f42ab7f05c9.tar.gz gcc-1c0290eaac40944ba6baed8323b74f42ab7f05c9.tar.bz2 |
Use cbranch patterns when available
From-SVN: r29613
Diffstat (limited to 'gcc/optabs.c')
-rw-r--r-- | gcc/optabs.c | 89 |
1 files changed, 48 insertions, 41 deletions
diff --git a/gcc/optabs.c b/gcc/optabs.c index a683fef..b424f1b 100644 --- a/gcc/optabs.c +++ b/gcc/optabs.c @@ -105,13 +105,8 @@ static void init_floating_libfuncs PROTO((optab, const char *, int)); #ifdef HAVE_conditional_trap static void init_traps PROTO((void)); #endif -static int cmp_available_p PROTO((enum machine_mode, int)); static void emit_cmp_and_jump_insn_1 PROTO((rtx, rtx, enum machine_mode, enum rtx_code, int, rtx)); -static void prepare_cmp_insn PROTO((rtx *, rtx *, enum rtx_code *, rtx, - enum machine_mode *, int *, int)); -static rtx prepare_operand PROTO((int, rtx, int, enum machine_mode, - enum machine_mode, int)); static void prepare_float_lib_cmp PROTO((rtx *, rtx *, enum rtx_code *, enum machine_mode *, int *)); @@ -2309,7 +2304,7 @@ expand_abs (mode, op0, target, safe) /* If this mode is an integer too wide to compare properly, compare word by word. Rely on CSE to optimize constant cases. */ - if (GET_MODE_CLASS (mode) == MODE_INT && ! can_compare_p (mode)) + if (GET_MODE_CLASS (mode) == MODE_INT && ! can_compare_p (mode, ccp_jump)) do_jump_by_parts_greater_rtx (mode, 0, target, const0_rtx, NULL_RTX, op1); else @@ -2823,22 +2818,32 @@ emit_0_to_1_insn (x) emit_move_insn (x, const1_rtx); } -/* Nonzero if we can perform a comparison of mode MODE for a conditional jump - straightforwardly. */ - -static int -cmp_available_p (mode, can_use_tst_p) +/* Nonzero if we can perform a comparison of mode MODE straightforwardly. + If FOR_JUMP is nonzero, we will be generating a jump based on this + comparison, otherwise a store-flags operation. */ + +int +can_compare_p (mode, purpose) enum machine_mode mode; - int can_use_tst_p; + enum can_compare_purpose purpose; { do { - if (cmp_optab->handlers[(int)mode].insn_code != CODE_FOR_nothing - || (can_use_tst_p - && tst_optab->handlers[(int)mode].insn_code != CODE_FOR_nothing)) + if (cmp_optab->handlers[(int)mode].insn_code != CODE_FOR_nothing) return 1; + if (purpose == ccp_jump + && cbranch_optab->handlers[(int)mode].insn_code != CODE_FOR_nothing) + return 1; + if (purpose == ccp_cmov + && cmov_optab->handlers[(int)mode].insn_code != CODE_FOR_nothing) + return 1; + if (purpose == ccp_store_flag + && cstore_optab->handlers[(int)mode].insn_code != CODE_FOR_nothing) + return 1; + mode = GET_MODE_WIDER_MODE (mode); - } while (mode != VOIDmode); + } + while (mode != VOIDmode); return 0; } @@ -2860,14 +2865,16 @@ cmp_available_p (mode, can_use_tst_p) The values which are passed in through pointers can be modified; the caller should perform the comparison on the modified values. */ -static void -prepare_cmp_insn (px, py, pcomparison, size, pmode, punsignedp, align) +void +prepare_cmp_insn (px, py, pcomparison, size, pmode, punsignedp, align, + purpose) rtx *px, *py; enum rtx_code *pcomparison; rtx size; enum machine_mode *pmode; int *punsignedp; int align; + enum can_compare_purpose purpose; { enum machine_mode mode = *pmode; rtx x = *px, y = *py; @@ -2988,7 +2995,7 @@ prepare_cmp_insn (px, py, pcomparison, size, pmode, punsignedp, align) *px = x; *py = y; - if (cmp_available_p (mode, y == CONST0_RTX (mode))) + if (can_compare_p (mode, purpose)) return; /* Handle a lib call just for the mode we are using. */ @@ -3032,7 +3039,7 @@ prepare_cmp_insn (px, py, pcomparison, size, pmode, punsignedp, align) to be used for operand OPNUM of the insn, is converted from mode MODE to WIDER_MODE (UNSIGNEDP determines whether it is a unsigned conversion), and that it is accepted by the operand predicate. Return the new value. */ -static rtx +rtx prepare_operand (icode, x, opnum, mode, wider_mode, unsignedp) int icode; rtx x; @@ -3074,6 +3081,20 @@ emit_cmp_and_jump_insn_1 (x, y, mode, comparison, unsignedp, label) enum insn_code icode; PUT_MODE (test, wider_mode); + if (label) + { + icode = cbranch_optab->handlers[(int)wider_mode].insn_code; + + if (icode != CODE_FOR_nothing + && (*insn_data[icode].operand[0].predicate) (test, wider_mode)) + { + x = prepare_operand (icode, x, 1, mode, wider_mode, unsignedp); + y = prepare_operand (icode, y, 2, mode, wider_mode, unsignedp); + emit_jump_insn (GEN_FCN (icode) (test, x, y, label)); + return; + } + } + /* Handle some compares against zero. */ icode = (int) tst_optab->handlers[(int) wider_mode].insn_code; if (y == CONST0_RTX (mode) && icode != CODE_FOR_nothing) @@ -3164,7 +3185,8 @@ emit_cmp_and_jump_insns (x, y, comparison, size, mode, unsignedp, align, label) emit_queue (); if (unsignedp) comparison = unsigned_condition (comparison); - prepare_cmp_insn (&op0, &op1, &comparison, size, &mode, &unsignedp, align); + prepare_cmp_insn (&op0, &op1, &comparison, size, &mode, &unsignedp, align, + ccp_jump); emit_cmp_and_jump_insn_1 (op0, op1, mode, comparison, unsignedp, label); } @@ -3180,24 +3202,6 @@ emit_cmp_insn (x, y, comparison, size, mode, unsignedp, align) { emit_cmp_and_jump_insns (x, y, comparison, size, mode, unsignedp, align, 0); } - - -/* Nonzero if a compare of mode MODE can be done straightforwardly - (without splitting it into pieces). */ - -int -can_compare_p (mode) - enum machine_mode mode; -{ - do - { - if (cmp_optab->handlers[(int)mode].insn_code != CODE_FOR_nothing) - return 1; - mode = GET_MODE_WIDER_MODE (mode); - } while (mode != VOIDmode); - - return 0; -} /* Emit a library call comparison between floating point X and Y. COMPARISON is the rtl operator to compare with (EQ, NE, GT, etc.). */ @@ -3876,8 +3880,8 @@ expand_float (to, from, unsignedp) do_pending_stack_adjust (); /* Test whether the sign bit is set. */ - emit_cmp_insn (from, const0_rtx, GE, NULL_RTX, imode, 0, 0); - emit_jump_insn (gen_blt (neglabel)); + emit_cmp_and_jump_insns (from, const0_rtx, LT, NULL_RTX, imode, + 0, 0, neglabel); /* The sign bit is not set. Convert as signed. */ expand_float (target, from, 0); @@ -4467,6 +4471,9 @@ init_optabs () sin_optab = init_optab (UNKNOWN); cos_optab = init_optab (UNKNOWN); strlen_optab = init_optab (UNKNOWN); + cbranch_optab = init_optab (UNKNOWN); + cmov_optab = init_optab (UNKNOWN); + cstore_optab = init_optab (UNKNOWN); for (i = 0; i < NUM_MACHINE_MODES; i++) { |