| Issue |
56677
|
| Summary |
optimize for builtin functions
|
| Labels |
|
| Assignees |
|
| Reporter |
BaoshanPang
|
Is it possible to teach llvm do optimizations on builtin functions?
For such code:
void test_mtspr() {
__builtin_ppc_mtspr(3,5);
__builtin_ppc_mtspr(3,5);
}
With command:
clang -cc1 -internal-isystem ~/mywork/llvm/build/lib/clang/15.0.0/include -nostdsysteminc -triple powerpc-unknown-unknown -S y.c -O2
The generated asm code is like this:
# %bb.0: # %entry
li 3, 5
mtudscr 3
mtudscr 3
blr
Can LLVM remove the second mtudscr?
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