261 lines
7.4 KiB
LLVM
261 lines
7.4 KiB
LLVM
; RUN: opt < %s -S -early-cse -earlycse-debug-hash | FileCheck %s
|
|
; RUN: opt < %s -S -basic-aa -early-cse-memssa | FileCheck %s
|
|
|
|
; CHECK-LABEL: @test12(
|
|
define i32 @test12(i1 %B, i32* %P1, i32* %P2) {
|
|
%load0 = load i32, i32* %P1
|
|
%1 = load atomic i32, i32* %P2 seq_cst, align 4
|
|
%load1 = load i32, i32* %P1
|
|
%sel = select i1 %B, i32 %load0, i32 %load1
|
|
ret i32 %sel
|
|
; CHECK: load i32, i32* %P1
|
|
; CHECK: load i32, i32* %P1
|
|
}
|
|
|
|
; CHECK-LABEL: @test13(
|
|
; atomic to non-atomic forwarding is legal
|
|
define i32 @test13(i1 %B, i32* %P1) {
|
|
%a = load atomic i32, i32* %P1 seq_cst, align 4
|
|
%b = load i32, i32* %P1
|
|
%res = sub i32 %a, %b
|
|
ret i32 %res
|
|
; CHECK: load atomic i32, i32* %P1
|
|
; CHECK: ret i32 0
|
|
}
|
|
|
|
; CHECK-LABEL: @test14(
|
|
; atomic to unordered atomic forwarding is legal
|
|
define i32 @test14(i1 %B, i32* %P1) {
|
|
%a = load atomic i32, i32* %P1 seq_cst, align 4
|
|
%b = load atomic i32, i32* %P1 unordered, align 4
|
|
%res = sub i32 %a, %b
|
|
ret i32 %res
|
|
; CHECK: load atomic i32, i32* %P1 seq_cst
|
|
; CHECK-NEXT: ret i32 0
|
|
}
|
|
|
|
; CHECK-LABEL: @test15(
|
|
; implementation restriction: can't forward to stonger
|
|
; than unordered
|
|
define i32 @test15(i1 %B, i32* %P1, i32* %P2) {
|
|
%a = load atomic i32, i32* %P1 seq_cst, align 4
|
|
%b = load atomic i32, i32* %P1 seq_cst, align 4
|
|
%res = sub i32 %a, %b
|
|
ret i32 %res
|
|
; CHECK: load atomic i32, i32* %P1
|
|
; CHECK: load atomic i32, i32* %P1
|
|
}
|
|
|
|
; CHECK-LABEL: @test16(
|
|
; forwarding non-atomic to atomic is wrong! (However,
|
|
; it would be legal to use the later value in place of the
|
|
; former in this particular example. We just don't
|
|
; do that right now.)
|
|
define i32 @test16(i1 %B, i32* %P1, i32* %P2) {
|
|
%a = load i32, i32* %P1, align 4
|
|
%b = load atomic i32, i32* %P1 unordered, align 4
|
|
%res = sub i32 %a, %b
|
|
ret i32 %res
|
|
; CHECK: load i32, i32* %P1
|
|
; CHECK: load atomic i32, i32* %P1
|
|
}
|
|
|
|
; Can't DSE across a full fence
|
|
define void @fence_seq_cst_store(i1 %B, i32* %P1, i32* %P2) {
|
|
; CHECK-LABEL: @fence_seq_cst_store
|
|
; CHECK: store
|
|
; CHECK: store atomic
|
|
; CHECK: store
|
|
store i32 0, i32* %P1, align 4
|
|
store atomic i32 0, i32* %P2 seq_cst, align 4
|
|
store i32 0, i32* %P1, align 4
|
|
ret void
|
|
}
|
|
|
|
; Can't DSE across a full fence
|
|
define void @fence_seq_cst(i1 %B, i32* %P1, i32* %P2) {
|
|
; CHECK-LABEL: @fence_seq_cst
|
|
; CHECK: store
|
|
; CHECK: fence seq_cst
|
|
; CHECK: store
|
|
store i32 0, i32* %P1, align 4
|
|
fence seq_cst
|
|
store i32 0, i32* %P1, align 4
|
|
ret void
|
|
}
|
|
|
|
; Can't DSE across a full fence
|
|
define void @fence_asm_sideeffect(i1 %B, i32* %P1, i32* %P2) {
|
|
; CHECK-LABEL: @fence_asm_sideeffect
|
|
; CHECK: store
|
|
; CHECK: call void asm sideeffect
|
|
; CHECK: store
|
|
store i32 0, i32* %P1, align 4
|
|
call void asm sideeffect "", ""()
|
|
store i32 0, i32* %P1, align 4
|
|
ret void
|
|
}
|
|
|
|
; Can't DSE across a full fence
|
|
define void @fence_asm_memory(i1 %B, i32* %P1, i32* %P2) {
|
|
; CHECK-LABEL: @fence_asm_memory
|
|
; CHECK: store
|
|
; CHECK: call void asm
|
|
; CHECK: store
|
|
store i32 0, i32* %P1, align 4
|
|
call void asm "", "~{memory}"()
|
|
store i32 0, i32* %P1, align 4
|
|
ret void
|
|
}
|
|
|
|
; Can't remove a volatile load
|
|
define i32 @volatile_load(i1 %B, i32* %P1, i32* %P2) {
|
|
%a = load i32, i32* %P1, align 4
|
|
%b = load volatile i32, i32* %P1, align 4
|
|
%res = sub i32 %a, %b
|
|
ret i32 %res
|
|
; CHECK-LABEL: @volatile_load
|
|
; CHECK: load i32, i32* %P1
|
|
; CHECK: load volatile i32, i32* %P1
|
|
}
|
|
|
|
; Can't remove redundant volatile loads
|
|
define i32 @redundant_volatile_load(i1 %B, i32* %P1, i32* %P2) {
|
|
%a = load volatile i32, i32* %P1, align 4
|
|
%b = load volatile i32, i32* %P1, align 4
|
|
%res = sub i32 %a, %b
|
|
ret i32 %res
|
|
; CHECK-LABEL: @redundant_volatile_load
|
|
; CHECK: load volatile i32, i32* %P1
|
|
; CHECK: load volatile i32, i32* %P1
|
|
; CHECK: sub
|
|
}
|
|
|
|
; Can't DSE a volatile store
|
|
define void @volatile_store(i1 %B, i32* %P1, i32* %P2) {
|
|
; CHECK-LABEL: @volatile_store
|
|
; CHECK: store volatile
|
|
; CHECK: store
|
|
store volatile i32 0, i32* %P1, align 4
|
|
store i32 3, i32* %P1, align 4
|
|
ret void
|
|
}
|
|
|
|
; Can't DSE a redundant volatile store
|
|
define void @redundant_volatile_store(i1 %B, i32* %P1, i32* %P2) {
|
|
; CHECK-LABEL: @redundant_volatile_store
|
|
; CHECK: store volatile
|
|
; CHECK: store volatile
|
|
store volatile i32 0, i32* %P1, align 4
|
|
store volatile i32 0, i32* %P1, align 4
|
|
ret void
|
|
}
|
|
|
|
; Can value forward from volatiles
|
|
define i32 @test20(i1 %B, i32* %P1, i32* %P2) {
|
|
%a = load volatile i32, i32* %P1, align 4
|
|
%b = load i32, i32* %P1, align 4
|
|
%res = sub i32 %a, %b
|
|
ret i32 %res
|
|
; CHECK-LABEL: @test20
|
|
; CHECK: load volatile i32, i32* %P1
|
|
; CHECK: ret i32 0
|
|
}
|
|
|
|
; Can DSE a non-volatile store in favor of a volatile one
|
|
; currently a missed optimization
|
|
define void @test21(i1 %B, i32* %P1, i32* %P2) {
|
|
; CHECK-LABEL: @test21
|
|
; CHECK: store
|
|
; CHECK: store volatile
|
|
store i32 0, i32* %P1, align 4
|
|
store volatile i32 3, i32* %P1, align 4
|
|
ret void
|
|
}
|
|
|
|
; Can DSE a normal store in favor of a unordered one
|
|
define void @test22(i1 %B, i32* %P1, i32* %P2) {
|
|
; CHECK-LABEL: @test22
|
|
; CHECK-NEXT: store atomic
|
|
store i32 0, i32* %P1, align 4
|
|
store atomic i32 3, i32* %P1 unordered, align 4
|
|
ret void
|
|
}
|
|
|
|
; Can also DSE a unordered store in favor of a normal one
|
|
define void @test23(i1 %B, i32* %P1, i32* %P2) {
|
|
; CHECK-LABEL: @test23
|
|
; CHECK-NEXT: store i32 0
|
|
store atomic i32 3, i32* %P1 unordered, align 4
|
|
store i32 0, i32* %P1, align 4
|
|
ret void
|
|
}
|
|
|
|
; As an implementation limitation, can't remove ordered stores
|
|
; Note that we could remove the earlier store if we could
|
|
; represent the required ordering.
|
|
define void @test24(i1 %B, i32* %P1, i32* %P2) {
|
|
; CHECK-LABEL: @test24
|
|
; CHECK-NEXT: store atomic
|
|
; CHECK-NEXT: store i32 0
|
|
store atomic i32 3, i32* %P1 release, align 4
|
|
store i32 0, i32* %P1, align 4
|
|
ret void
|
|
}
|
|
|
|
; Can't remove volatile stores - each is independently observable and
|
|
; the count of such stores is an observable program side effect.
|
|
define void @test25(i1 %B, i32* %P1, i32* %P2) {
|
|
; CHECK-LABEL: @test25
|
|
; CHECK-NEXT: store volatile
|
|
; CHECK-NEXT: store volatile
|
|
store volatile i32 3, i32* %P1, align 4
|
|
store volatile i32 0, i32* %P1, align 4
|
|
ret void
|
|
}
|
|
|
|
; Can DSE a unordered store in favor of a unordered one
|
|
define void @test26(i1 %B, i32* %P1, i32* %P2) {
|
|
; CHECK-LABEL: @test26
|
|
; CHECK-NEXT: store atomic i32 3, i32* %P1 unordered, align 4
|
|
; CHECK-NEXT: ret
|
|
store atomic i32 0, i32* %P1 unordered, align 4
|
|
store atomic i32 3, i32* %P1 unordered, align 4
|
|
ret void
|
|
}
|
|
|
|
; Can DSE a unordered store in favor of a ordered one,
|
|
; but current don't due to implementation limits
|
|
define void @test27(i1 %B, i32* %P1, i32* %P2) {
|
|
; CHECK-LABEL: @test27
|
|
; CHECK-NEXT: store atomic i32 0, i32* %P1 unordered, align 4
|
|
; CHECK-NEXT: store atomic i32 3, i32* %P1 release, align 4
|
|
; CHECK-NEXT: ret
|
|
store atomic i32 0, i32* %P1 unordered, align 4
|
|
store atomic i32 3, i32* %P1 release, align 4
|
|
ret void
|
|
}
|
|
|
|
; Can DSE an unordered atomic store in favor of an
|
|
; ordered one, but current don't due to implementation limits
|
|
define void @test28(i1 %B, i32* %P1, i32* %P2) {
|
|
; CHECK-LABEL: @test28
|
|
; CHECK-NEXT: store atomic i32 0, i32* %P1 unordered, align 4
|
|
; CHECK-NEXT: store atomic i32 3, i32* %P1 release, align 4
|
|
; CHECK-NEXT: ret
|
|
store atomic i32 0, i32* %P1 unordered, align 4
|
|
store atomic i32 3, i32* %P1 release, align 4
|
|
ret void
|
|
}
|
|
|
|
; As an implementation limitation, can't remove ordered stores
|
|
; see also: @test24
|
|
define void @test29(i1 %B, i32* %P1, i32* %P2) {
|
|
; CHECK-LABEL: @test29
|
|
; CHECK-NEXT: store atomic
|
|
; CHECK-NEXT: store atomic
|
|
store atomic i32 3, i32* %P1 release, align 4
|
|
store atomic i32 0, i32* %P1 unordered, align 4
|
|
ret void
|
|
}
|