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| author | Andrew Waterman <waterman@cs.berkeley.edu> | 2015-11-16 19:53:34 -0800 |
|---|---|---|
| committer | Andrew Waterman <waterman@cs.berkeley.edu> | 2015-11-16 19:53:34 -0800 |
| commit | 48e795d4840529df2f3a0b8d1c44276ec43cc232 (patch) | |
| tree | b567ea77a72f2e5f52bfce0d33a09c23cb64708d /gcc | |
| parent | 3cf7d19af885e7f3c94a16df7e82068539c1dc5d (diff) | |
| download | riscv-gnu-toolchain-48e795d4840529df2f3a0b8d1c44276ec43cc232.zip riscv-gnu-toolchain-48e795d4840529df2f3a0b8d1c44276ec43cc232.tar.gz riscv-gnu-toolchain-48e795d4840529df2f3a0b8d1c44276ec43cc232.tar.bz2 | |
gcc: add peephole to optimize indexing with uint32
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/gcc/config/riscv/peephole.md | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/gcc/gcc/config/riscv/peephole.md b/gcc/gcc/config/riscv/peephole.md index beeed6c..15eb946 100644 --- a/gcc/gcc/config/riscv/peephole.md +++ b/gcc/gcc/config/riscv/peephole.md @@ -42,6 +42,27 @@ [(set (match_dup 3) (match_op_dup:SI 4 [(match_dup 1) (match_dup 2)]))]) +;; Simplify (unsigned long)(unsigned int)a << const +(define_peephole2 + [(set (match_operand:DI 0 "register_operand") + (ashift:DI (match_operand:DI 1 "register_operand") + (match_operand 2 "const_int_operand"))) + (set (match_operand:DI 3 "register_operand") + (lshiftrt:DI (match_dup 0) (match_dup 2))) + (set (match_operand:DI 4 "register_operand") + (ashift:DI (match_dup 3) (match_operand 5 "const_int_operand")))] + "TARGET_64BIT + && INTVAL (operands[5]) < INTVAL (operands[2]) + && (REGNO (operands[3]) == REGNO (operands[4]) + || peep2_reg_dead_p (3, operands[3]))" + [(set (match_dup 0) + (ashift:DI (match_dup 1) (match_dup 2))) + (set (match_dup 4) + (lshiftrt:DI (match_dup 0) (match_operand 5)))] +{ + operands[5] = GEN_INT (INTVAL (operands[2]) - INTVAL (operands[5])); +}) + ;; Simplify PIC loads to static variables. ;; These will go away once we figure out how to emit auipc discretely. (define_insn "*local_pic_load<mode>" |