compare-elim.c (try_eliminate_compare): Canonicalize operation with embedded compare to [(set (reg:CCM) (compare:CCM...
* compare-elim.c (try_eliminate_compare): Canonicalize operation with embedded compare to [(set (reg:CCM) (compare:CCM (operation) (immediate))) (set (reg) (operation)]. * config/i386/i386.c (TARGET_FLAGS_REGNUM): New define. From-SVN: r247992
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@ -1,3 +1,12 @@
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2017-05-12 Uros Bizjak <ubizjak@gmail.com>
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* compare-elim.c (try_eliminate_compare): Canonicalize
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operation with embedded compare to
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[(set (reg:CCM) (compare:CCM (operation) (immediate)))
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(set (reg) (operation)].
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* config/i386/i386.c (TARGET_FLAGS_REGNUM): New define.
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2017-05-12 Uros Bizjak <ubizjak@gmail.com>
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PR target/80723
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@ -45,8 +45,8 @@ along with GCC; see the file COPYING3. If not see
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(3) If an insn of form (2) can usefully set the flags, there is
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another pattern of the form
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[(set (reg) (operation)
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(set (reg:CCM) (compare:CCM (operation) (immediate)))]
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[(set (reg:CCM) (compare:CCM (operation) (immediate)))
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(set (reg) (operation)]
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The mode CCM will be chosen as if by SELECT_CC_MODE.
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@ -582,7 +582,7 @@ equivalent_reg_at_start (rtx reg, rtx_insn *end, rtx_insn *start)
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static bool
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try_eliminate_compare (struct comparison *cmp)
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{
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rtx x, flags, in_a, in_b, cmp_src;
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rtx flags, in_a, in_b, cmp_src;
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/* We must have found an interesting "clobber" preceding the compare. */
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if (cmp->prev_clobber == NULL)
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@ -628,7 +628,8 @@ try_eliminate_compare (struct comparison *cmp)
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Validate that PREV_CLOBBER itself does in fact refer to IN_A. Do
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recall that we've already validated the shape of PREV_CLOBBER. */
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rtx_insn *insn = cmp->prev_clobber;
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x = XVECEXP (PATTERN (insn), 0, 0);
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rtx x = XVECEXP (PATTERN (insn), 0, 0);
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if (rtx_equal_p (SET_DEST (x), in_a))
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cmp_src = SET_SRC (x);
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@ -666,13 +667,24 @@ try_eliminate_compare (struct comparison *cmp)
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flags = gen_rtx_REG (cmp->orig_mode, targetm.flags_regnum);
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/* Generate a new comparison for installation in the setter. */
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x = copy_rtx (cmp_src);
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x = gen_rtx_COMPARE (GET_MODE (flags), x, in_b);
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x = gen_rtx_SET (flags, x);
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rtx y = copy_rtx (cmp_src);
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y = gen_rtx_COMPARE (GET_MODE (flags), y, in_b);
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y = gen_rtx_SET (flags, y);
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/* Canonicalize instruction to:
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[(set (reg:CCM) (compare:CCM (operation) (immediate)))
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(set (reg) (operation)] */
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rtvec v = rtvec_alloc (2);
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RTVEC_ELT (v, 0) = y;
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RTVEC_ELT (v, 1) = x;
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rtx pat = gen_rtx_PARALLEL (VOIDmode, v);
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/* Succeed if the new instruction is valid. Note that we may have started
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a change group within maybe_select_cc_mode, therefore we must continue. */
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validate_change (insn, &XVECEXP (PATTERN (insn), 0, 1), x, true);
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validate_change (insn, &PATTERN (insn), pat, true);
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if (!apply_change_group ())
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return false;
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@ -51826,6 +51826,8 @@ ix86_run_selftests (void)
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#undef TARGET_ADDRESS_COST
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#define TARGET_ADDRESS_COST ix86_address_cost
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#undef TARGET_FLAGS_REGNUM
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#define TARGET_FLAGS_REGNUM FLAGS_REG
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#undef TARGET_FIXED_CONDITION_CODE_REGS
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#define TARGET_FIXED_CONDITION_CODE_REGS ix86_fixed_condition_code_regs
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#undef TARGET_CC_MODES_COMPATIBLE
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