19fb5a210d
Enable peephole optimizations for aarch64. Also small code refactoring - add PeepholeOpts under Peepholes class. Vladislav Khmelevsky, Advanced Software Technology Lab, Huawei Differential Revision: https://reviews.llvm.org/D118732
36 lines
764 B
C++
36 lines
764 B
C++
// A contrived example to test the double jump removal peephole.
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extern "C" unsigned long bar(unsigned long count) {
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return count + 1;
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}
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unsigned long foo(unsigned long count) {
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asm(
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" cmpq $1,%0\n"
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" je .L7\n"
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" incq %0\n"
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" jmp .L1\n"
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".L1: jmp .L2\n"
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".L2: incq %0\n"
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" cmpq $2,%0\n"
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" jne .L3\n"
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" jmp .L4\n"
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".L3: jmp .L5\n"
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".L5: incq %0\n"
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".L4: movq %0,%%rdi\n"
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" pop %%rbp\n"
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" jmp .L6\n"
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".L7: pop %%rbp\n"
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" incq %0\n"
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" jmp .L6\n"
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".L6: jmp bar\n"
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:
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: "m"(count)
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);
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return count;
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}
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int main(int argc, const char* argv[]) {
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return foo(38);
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}
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