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| author | Oleg Endo <olegendo@gcc.gnu.org> | 2014-12-24 21:55:59 +0000 |
|---|---|---|
| committer | Oleg Endo <olegendo@gcc.gnu.org> | 2014-12-24 21:55:59 +0000 |
| commit | 2219f0c2990ec05322bf063ce23385b42583a311 (patch) | |
| tree | 072fabd536e31b9c2ef0378066ce7634253149a9 /gcc/config | |
| parent | 285470983b6dda9f600e3dc20f134a925de61ddf (diff) | |
| download | gcc-2219f0c2990ec05322bf063ce23385b42583a311.zip gcc-2219f0c2990ec05322bf063ce23385b42583a311.tar.gz gcc-2219f0c2990ec05322bf063ce23385b42583a311.tar.bz2 | |
re PR target/51244 ([SH] Inefficient conditional branch and code around T bit)
gcc/
PR target/51244
* config/sh/sh.md (*mov_t_msb_neg): Convert split into insn_and_split.
From-SVN: r219062
Diffstat (limited to 'gcc/config')
| -rw-r--r-- | gcc/config/sh/sh.md | 28 |
1 files changed, 14 insertions, 14 deletions
diff --git a/gcc/config/sh/sh.md b/gcc/config/sh/sh.md index 7b68aa1..225cc361 100644 --- a/gcc/config/sh/sh.md +++ b/gcc/config/sh/sh.md @@ -11601,8 +11601,8 @@ label: (set (match_dup 0) (xor:SI (match_dup 0) (const_int 1)))]) ;; Use negc to store the T bit in a MSB of a reg in the following way: -;; T = 1: 0x80000000 -> reg -;; T = 0: 0x7FFFFFFF -> reg +;; T = 0: 0x80000000 -> reg +;; T = 1: 0x7FFFFFFF -> reg ;; This works because 0 - 0x80000000 = 0x80000000. ;; ;; This insn must not match again after it has been split into the constant @@ -11635,27 +11635,27 @@ label: "negc %1,%0" [(set_attr "type" "arith")]) -;; These are essentially the same as above, but with the inverted T bit. -;; Combine recognizes the split patterns, but does not take them sometimes -;; if the T_REG clobber is specified. Instead it tries to split out the -;; T bit negation. Since these splits are supposed to be taken only by -;; combine, it will see the T_REG clobber of the *mov_t_msb_neg insn, so this -;; should be fine. -(define_split +(define_insn_and_split "*mov_t_msb_neg" [(set (match_operand:SI 0 "arith_reg_dest") (plus:SI (match_operand 1 "negt_reg_operand") - (const_int 2147483647)))] ;; 0x7fffffff - "TARGET_SH1 && can_create_pseudo_p ()" + (const_int 2147483647))) ;; 0x7fffffff + (clobber (reg:SI T_REG))] + "TARGET_SH1" + "#" + "&& can_create_pseudo_p ()" [(parallel [(set (match_dup 0) (minus:SI (const_int -2147483648) (reg:SI T_REG))) (clobber (reg:SI T_REG))])]) -(define_split +(define_insn_and_split "*mov_t_msb_neg" [(set (match_operand:SI 0 "arith_reg_dest") (if_then_else:SI (match_operand 1 "t_reg_operand") (const_int 2147483647) ;; 0x7fffffff - (const_int -2147483648)))] ;; 0x80000000 - "TARGET_SH1 && can_create_pseudo_p ()" + (const_int -2147483648))) ;; 0x80000000 + (clobber (reg:SI T_REG))] + "TARGET_SH1" + "#" + "&& can_create_pseudo_p ()" [(parallel [(set (match_dup 0) (minus:SI (const_int -2147483648) (reg:SI T_REG))) (clobber (reg:SI T_REG))])]) |