search for: volatile_on

Displaying 2 results from an estimated 2 matches for "volatile_on".

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2017 Dec 21
4
Hoisting in the presence of volatile loads.
...nalysis/MemorySSA/volatile-clobber.ll, is > checking that a volatile load is the defining access of a load with > which it may alias. > > Snippet: > ; Ensuring that we don't automatically hoist nonvolatile loads around > volatile > ; loads > ; CHECK-LABEL define void @volatile_only > define void @volatile_only(i32* %arg1, i32* %arg2) { > [...] > ; MayAlias > ; CHECK: 2 = MemoryDef(1) > ; CHECK-NEXT: load volatile i32, i32* %arg1 > load volatile i32, i32* %arg1 > ; CHECK: MemoryUse(2) > ; CHECK-NEXT: load i32, i32* %arg2 > load i32, i32* %arg2...
2017 Dec 20
4
Hoisting in the presence of volatile loads.
On 12/20/2017 1:37 PM, Sanjoy Das wrote:> > Fwiw, I was under the impression that regular loads could *not* be > reordered with volatile loads since we could have e.g.: > > int *normal = &global_variable; > volatile int* ptr = 0; > int k = *ptr; // segfaults, and the signal handler writes to *normal > int value = *normal; > > and that we'd have