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[riscv] Optimize ComputeCodeStartAddress func

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We can only use auipc + add instr to get pc address.

Change-Id: I44d7dd1798c94d672bf506658c82c80de601a4af
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/4039240
Reviewed-by: ji qiu <qiuji@iscas.ac.cn>
Commit-Queue: ji qiu <qiuji@iscas.ac.cn>
Auto-Submit: Yahan Lu <yahan@iscas.ac.cn>
Cr-Commit-Position: refs/heads/main@{#84415}
This commit is contained in:
Lu Yahan 2022-11-21 18:50:59 +08:00 committed by V8 LUCI CQ
parent f76262d87a
commit 8757293d7e
1 changed files with 3 additions and 11 deletions
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14
src/codegen/riscv/macro-assembler-riscv.cc
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@ -6171,17 +6171,9 @@ Register GetRegisterThatIsNotOneOf(Register reg1, Register reg2, Register reg3,
} }
void TurboAssembler::ComputeCodeStartAddress(Register dst) { void TurboAssembler::ComputeCodeStartAddress(Register dst) {
// This push on ra and the pop below together ensure that we restore the auto pc = -pc_offset();
// register ra, which is needed while computing the code start address. auipc(dst, 0);
push(ra); if(pc != 0) SubWord(dst, dst, pc);
auipc(ra, 0);
addi(ra, ra, kInstrSize * 2); // ra = address of li
int pc = pc_offset();
li(dst, Operand(pc));
SubWord(dst, ra, dst);
pop(ra); // Restore ra
} }
void TurboAssembler::CallForDeoptimization(Builtin target, int, Label* exit, void TurboAssembler::CallForDeoptimization(Builtin target, int, Label* exit,