Update to use the now legacy format by using llvm_asm

jlb6740 · jlb6740 · commit f7945d5bb072 · 2020-07-24T18:03:30.000-07:00
https://github.com/rust-lang/rfcs/blob/master/text/2843-llvm-asm.md rust-lang/rfcs#2873
diff --git a/src/cpucounter.rs b/src/cpucounter.rs
@@ -10,14 +10,13 @@ unsafe fn cpucounter() -> u64 {
     (high << 32) | low
 }
 
-
 // https://github.com/google/benchmark/blob/v1.1.0/src/cycleclock.h#L116
 #[cfg(asm)]
 #[inline]
 #[cfg(any(target_arch = "aarch64"))]
 unsafe fn cpucounter() -> u64 {
     let (vtm): (u64);
-    asm!("mrs %0, cntvct_el0" : "=r"(vtm));
+    llvm_asm!("mrs %0, cntvct_el0" : "=r"(vtm));
     vtm
 }
 
diff --git a/src/lib.rs b/src/lib.rs
@@ -1,4 +1,5 @@
 #![cfg_attr(asm, feature(asm))]
+#![feature(llvm_asm)]
 
 //! Precision is a simple crate to perform measurements using hardware counters.
 //!

Original file line number	Diff line number	Diff line change
`@@ -10,14 +10,13 @@ unsafe fn cpucounter() -> u64 {`
`10`	`10`	`(high << 32) \| low`
`11`	`11`	`}`
`12`	`12`
`13`		`-`
`14`	`13`	`// https://github.com/google/benchmark/blob/v1.1.0/src/cycleclock.h#L116`
`15`	`14`	`#[cfg(asm)]`
`16`	`15`	`#[inline]`
`17`	`16`	`#[cfg(any(target_arch = "aarch64"))]`
`18`	`17`	`unsafe fn cpucounter() -> u64 {`
`19`	`18`	`let (vtm): (u64);`
`20`		`- asm!("mrs %0, cntvct_el0" : "=r"(vtm));`
	`19`	`+ llvm_asm!("mrs %0, cntvct_el0" : "=r"(vtm));`
`21`	`20`	`vtm`
`22`	`21`	`}`
`23`	`22`
Original file line number	Diff line number	Diff line change
`@@ -1,4 +1,5 @@`
`1`	`1`	`#![cfg_attr(asm, feature(asm))]`
	`2`	`+#![feature(llvm_asm)]`
`2`	`3`
`3`	`4`	`//! Precision is a simple crate to perform measurements using hardware counters.`
`4`	`5`	`//!`