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LoongArch/GAS: Add support for branch relaxation

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For the instructions of R_LARCH_B16/B21, if the immediate overflow,
add a B instruction and R_LARCH_B26 relocation.

For example:

.L1
  ...
  blt $t0, $t1, .L1
    R_LARCH_B16

change to:

.L1
  ...
  bge $t0, $t1, .L2
  b .L1
    R_LARCH_B26
.L2
This commit is contained in:
mengqinggang
2023-09-24 14:53:28 +08:00
committed by liuzhensong
parent 9847ba8f08
commit 1fb3cdd87e
6 changed files with 366 additions and 40 deletions
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12
include/opcode/loongarch.h
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@@ -29,6 +29,18 @@ extern "C"
#endif
#define LARCH_NOP 0x03400000
#define LARCH_B 0x50000000
/* BCEQZ/BCNEZ. */
#define LARCH_FLOAT_BRANCH 0x48000000
#define LARCH_BRANCH_OPCODE_MASK 0xfc000000
#define LARCH_BRANCH_INVERT_BIT 0x04000000
#define LARCH_FLOAT_BRANCH_INVERT_BIT 0x00000100
#define ENCODE_BRANCH16_IMM(x) (((x) >> 2) << 10)
#define OUT_OF_RANGE(value, bits, align) \
((value) < (-(1 << ((bits) - 1) << align)) \
|| (value) > ((((1 << ((bits) - 1)) - 1) << align)))
typedef uint32_t insn_t;