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35cd7fac8b
* lightening/x86.c (jit_try_shorten): If the address is within the last instruction, don't shorten. If the intstruction is a jump, we could elide it entirely in some cases, but we don't know if the user captured the PC before calling jit_patch_here. Better to leave this to the user. Thanks to Helmut Eller for the bug report and test case in https://gitlab.com/wingo/lightening/-/issues/17.
24 lines
553 B
C
24 lines
553 B
C
#include "test.h"
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static void
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run_test(jit_state_t *j, uint8_t *arena_base, size_t arena_size)
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{
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jit_begin(j, arena_base, arena_size);
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size_t align = jit_enter_jit_abi(j, 0, 0, 0);
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jit_load_args_1(j, jit_operand_gpr (JIT_OPERAND_ABI_WORD, JIT_R0));
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jit_reloc_t r = jit_jmp(j);
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jit_patch_here(j, r);
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jit_leave_jit_abi(j, 0, 0, align);
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jit_retr(j, JIT_R0);
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jit_word_t (*f)(jit_word_t) = jit_end(j, NULL);
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ASSERT(f(42) == 42);
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ASSERT(f(-1) == -1);
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}
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int
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main (int argc, char *argv[])
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{
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return main_helper(argc, argv, run_test);
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}
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