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| author | Oliver Schneider <git-spam-no-reply9815368754983@oli-obk.de> | 2017-08-16 15:41:09 +0200 |
|---|---|---|
| committer | Oliver Schneider <git-spam-no-reply9815368754983@oli-obk.de> | 2017-08-21 15:57:21 +0200 |
| commit | 1dc3a2b5fa6de4aab7854b122213971217f13d77 (patch) | |
| tree | 3497aaf28b251c5768d91832901dc7cc3be0da9f /src/librustc_trans | |
| parent | 1b08e0f231cd30719c25a5992f1d9bb27ea02b61 (diff) | |
| download | rust-1dc3a2b5fa6de4aab7854b122213971217f13d77.tar.gz rust-1dc3a2b5fa6de4aab7854b122213971217f13d77.zip | |
Add align_offset intrinsic
see https://github.com/rust-lang/rfcs/pull/2043 for details
Diffstat (limited to 'src/librustc_trans')
| -rw-r--r-- | src/librustc_trans/intrinsic.rs | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/src/librustc_trans/intrinsic.rs b/src/librustc_trans/intrinsic.rs index 033ef988571..9a3c8a5079a 100644 --- a/src/librustc_trans/intrinsic.rs +++ b/src/librustc_trans/intrinsic.rs @@ -383,6 +383,18 @@ pub fn trans_intrinsic_call<'a, 'tcx>(bcx: &Builder<'a, 'tcx>, _ => C_null(llret_ty) } } + + "align_offset" => { + // `ptr as usize` + let ptr_val = bcx.ptrtoint(llargs[0], bcx.ccx.int_type()); + // `ptr_val % align` + let offset = bcx.urem(ptr_val, llargs[1]); + let zero = C_null(bcx.ccx.int_type()); + // `offset == 0` + let is_zero = bcx.icmp(llvm::IntPredicate::IntEQ, offset, zero); + // `if offset == 0 { 0 } else { offset - align }` + bcx.select(is_zero, zero, bcx.sub(offset, llargs[1])) + } name if name.starts_with("simd_") => { generic_simd_intrinsic(bcx, name, callee_ty, |