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Do not hash leading zero bytes of i64 numbers in Sip128 hasher #92103

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merged 1 commit into from
Jan 5, 2022
Merged

Do not hash leading zero bytes of i64 numbers in Sip128 hasher #92103

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18 changes: 16 additions & 2 deletions compiler/rustc_data_structures/src/sip128.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -409,6 +409,20 @@ impl SipHasher128 {
}
}

macro_rules! dispatch_value {
($target: expr, $value:expr) => {
let value = $value;
#[allow(unreachable_patterns)]
#[allow(overflowing_literals)]
match value {
0..=0xFF => $target.short_write(value as u8),
0x100..=0xFFFF => $target.short_write(value as u16),
0x10000..=0xFFFFFFFF => $target.short_write(value as u32),
_ => $target.short_write(value as u64),
}
};
}

impl Hasher for SipHasher128 {
#[inline]
fn write_u8(&mut self, i: u8) {
Expand All @@ -422,7 +436,7 @@ impl Hasher for SipHasher128 {

#[inline]
fn write_u32(&mut self, i: u32) {
self.short_write(i);
dispatch_value!(self, i);
}

#[inline]
Expand Down Expand Up @@ -452,7 +466,7 @@ impl Hasher for SipHasher128 {

#[inline]
fn write_i64(&mut self, i: i64) {
self.short_write(i as u64);
dispatch_value!(self, i as u64);
}

#[inline]
Expand Down
4 changes: 2 additions & 2 deletions src/test/debuginfo/function-names.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -37,7 +37,7 @@
// Const generic parameter
// gdb-command:info functions -q function_names::const_generic_fn.*
// gdb-check:[...]static fn function_names::const_generic_fn_bool<false>();
// gdb-check:[...]static fn function_names::const_generic_fn_non_int<{CONST#fe3cfa0214ac55c7}>();
// gdb-check:[...]static fn function_names::const_generic_fn_non_int<{CONST#3fcd7c34c1555be6}>();
// gdb-check:[...]static fn function_names::const_generic_fn_signed_int<-7>();
// gdb-check:[...]static fn function_names::const_generic_fn_unsigned_int<14>();

Expand Down Expand Up @@ -76,7 +76,7 @@
// Const generic parameter
// cdb-command:x a!function_names::const_generic_fn*
// cdb-check:[...] a!function_names::const_generic_fn_bool<false> (void)
// cdb-check:[...] a!function_names::const_generic_fn_non_int<CONST$fe3cfa0214ac55c7> (void)
// cdb-check:[...] a!function_names::const_generic_fn_non_int<CONST$3fcd7c34c1555be6> (void)
// cdb-check:[...] a!function_names::const_generic_fn_unsigned_int<14> (void)
// cdb-check:[...] a!function_names::const_generic_fn_signed_int<-7> (void)

Expand Down