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GH-139757: JIT: Remove redundant branches to jumps in the assembly optimizer (GH-140800)

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JIT: Remove redundant branches to jump in the assembly optimizer

* Refactor JIT assembly optimizer making instructions instances not just strings
* Remove redundant jumps and branches where legal to do so
* Modifies _BINARY_OP_SUBSCR_STR_INT to avoid excessive inlining depth
This commit is contained in:
Mark Shannon 2025-12-08 17:57:11 +00:00 • committed by GitHub
parent 37988c57ea
commit e0451ceef8
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8 changed files with 220 additions and 74 deletions
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3
Python/jit.c
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@ -185,6 +185,7 @@ set_bits(uint32_t *loc, uint8_t loc_start, uint64_t value, uint8_t value_start,
#define IS_AARCH64_ADRP(I) (((I) & 0x9F000000) == 0x90000000)
#define IS_AARCH64_BRANCH(I) (((I) & 0x7C000000) == 0x14000000)
#define IS_AARCH64_BRANCH_COND(I) (((I) & 0x7C000000) == 0x54000000)
#define IS_AARCH64_BRANCH_ZERO(I) (((I) & 0x7E000000) == 0x34000000)
#define IS_AARCH64_TEST_AND_BRANCH(I) (((I) & 0x7E000000) == 0x36000000)
#define IS_AARCH64_LDR_OR_STR(I) (((I) & 0x3B000000) == 0x39000000)
#define IS_AARCH64_MOV(I) (((I) & 0x9F800000) == 0x92800000)
@ -352,7 +353,7 @@ void
patch_aarch64_19r(unsigned char *location, uint64_t value)
{
uint32_t *loc32 = (uint32_t *)location;
assert(IS_AARCH64_BRANCH_COND(*loc32));
assert(IS_AARCH64_BRANCH_COND(*loc32) || IS_AARCH64_BRANCH_ZERO(*loc32));
value -= (uintptr_t)location;
// Check that we're not out of range of 21 signed bits:
assert((int64_t)value >= -(1 << 20));