volatile-clobber.ll
2.74 KB
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; RUN: opt -basicaa -print-memoryssa -verify-memoryssa -analyze < %s 2>&1 | FileCheck %s
; RUN: opt -aa-pipeline=basic-aa -passes='print<memoryssa>,verify<memoryssa>' -disable-output < %s 2>&1 | FileCheck %s
;
; Ensures that volatile stores/loads count as MemoryDefs
; CHECK-LABEL: define i32 @foo
define i32 @foo() {
%1 = alloca i32, align 4
; CHECK: 1 = MemoryDef(liveOnEntry)
; CHECK-NEXT: store volatile i32 4
store volatile i32 4, i32* %1, align 4
; CHECK: 2 = MemoryDef(1)
; CHECK-NEXT: store volatile i32 8
store volatile i32 8, i32* %1, align 4
; CHECK: 3 = MemoryDef(2)
; CHECK-NEXT: %2 = load volatile i32
%2 = load volatile i32, i32* %1, align 4
; CHECK: 4 = MemoryDef(3)
; CHECK-NEXT: %3 = load volatile i32
%3 = load volatile i32, i32* %1, align 4
%4 = add i32 %3, %2
ret i32 %4
}
; Ensuring we allow hoisting nonvolatile loads around volatile loads.
; CHECK-LABEL define void @volatile_only
define void @volatile_only(i32* %arg1, i32* %arg2) {
; Trivially NoAlias/MustAlias
%a = alloca i32
%b = alloca i32
; CHECK: 1 = MemoryDef(liveOnEntry)
; CHECK-NEXT: load volatile i32, i32* %a
load volatile i32, i32* %a
; CHECK: MemoryUse(liveOnEntry)
; CHECK-NEXT: load i32, i32* %b
load i32, i32* %b
; CHECK: MemoryUse(liveOnEntry)
; CHECK-NEXT: load i32, i32* %a
load i32, i32* %a
; MayAlias
; CHECK: 2 = MemoryDef(1)
; CHECK-NEXT: load volatile i32, i32* %arg1
load volatile i32, i32* %arg1
; CHECK: MemoryUse(liveOnEntry)
; CHECK-NEXT: load i32, i32* %arg2
load i32, i32* %arg2
ret void
}
; Ensuring that volatile atomic operations work properly.
; CHECK-LABEL define void @volatile_atomics
define void @volatile_atomics(i32* %arg1, i32* %arg2) {
%a = alloca i32
%b = alloca i32
; Trivially NoAlias/MustAlias
; CHECK: 1 = MemoryDef(liveOnEntry)
; CHECK-NEXT: load atomic volatile i32, i32* %a acquire, align 4
load atomic volatile i32, i32* %a acquire, align 4
; CHECK: MemoryUse(1)
; CHECK-NEXT: load i32, i32* %b
load i32, i32* %b
; CHECK: 2 = MemoryDef(1)
; CHECK-NEXT: load atomic volatile i32, i32* %a monotonic, align 4
load atomic volatile i32, i32* %a monotonic, align 4
; CHECK: MemoryUse(1)
; CHECK-NEXT: load i32, i32* %b
load i32, i32* %b
; CHECK: MemoryUse(1)
; CHECK-NEXT: load atomic i32, i32* %b unordered, align 4
load atomic i32, i32* %b unordered, align 4
; CHECK: MemoryUse(1)
; CHECK-NEXT: load atomic i32, i32* %a unordered, align 4
load atomic i32, i32* %a unordered, align 4
; CHECK: MemoryUse(1)
; CHECK-NEXT: load i32, i32* %a
load i32, i32* %a
; MayAlias
; CHECK: 3 = MemoryDef(2)
; CHECK-NEXT: load atomic volatile i32, i32* %arg1 monotonic, align 4
load atomic volatile i32, i32* %arg1 monotonic, align 4
; CHECK: MemoryUse(1)
; CHECK-NEXT: load i32, i32* %arg2
load i32, i32* %arg2
ret void
}