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add unchecked math intrinsics

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lcnr/Bastian Kauschke 2019-06-03 12:59:48 +02:00
parent d6266a7666
commit 4e7319cd3f
3 changed files with 40 additions and 2 deletions
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24
src/librustc_codegen_llvm/intrinsic.rs
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@ -334,7 +334,8 @@ impl IntrinsicCallMethods<'tcx> for Builder<'a, 'll, 'tcx> {
"ctlz" | "ctlz_nonzero" | "cttz" | "cttz_nonzero" | "ctpop" | "bswap" |
"bitreverse" | "add_with_overflow" | "sub_with_overflow" |
"mul_with_overflow" | "overflowing_add" | "overflowing_sub" | "overflowing_mul" |
"unchecked_div" | "unchecked_rem" | "unchecked_shl" | "unchecked_shr" | "exact_div" |
"unchecked_div" | "unchecked_rem" | "unchecked_shl" | "unchecked_shr" |
"unchecked_add" | "unchecked_sub" | "unchecked_mul" | "exact_div" |
"rotate_left" | "rotate_right" | "saturating_add" | "saturating_sub" => {
let ty = arg_tys[0];
match int_type_width_signed(ty, self) {
@ -430,6 +431,27 @@ impl IntrinsicCallMethods<'tcx> for Builder<'a, 'll, 'tcx> {
} else {
self.lshr(args[0].immediate(), args[1].immediate())
},
"unchecked_add" => {
if signed {
self.unchecked_sadd(args[0].immediate(), args[1].immediate())
} else {
self.unchecked_uadd(args[0].immediate(), args[1].immediate())
}
},
"unchecked_sub" => {
if signed {
self.unchecked_ssub(args[0].immediate(), args[1].immediate())
} else {
self.unchecked_usub(args[0].immediate(), args[1].immediate())
}
},
"unchecked_mul" => {
if signed {
self.unchecked_smul(args[0].immediate(), args[1].immediate())
} else {
self.unchecked_umul(args[0].immediate(), args[1].immediate())
}
},
"rotate_left" | "rotate_right" => {
let is_left = name == "rotate_left";
let val = args[0].immediate();