caio/clang-p2996
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity
Files
fc8a08765af8f32663776a42e85b28362b5658ce
clang-p2996/llvm/test/Transforms/DeadStoreElimination/simple.ll
Nikita Popov ae64c5a0fd [DSE][MemLoc] Handle intrinsics more generically 
Remove the special casing for intrinsics in MemoryLocation::getForDest()
and handle them through the general attribute based code. On the DSE
side, this means that isRemovable() now needs to handle more than a
hardcoded list of intrinsics. We consider everything apart from
volatile memory intrinsics and lifetime markers to be removable.

This allows us to perform DSE on intrinsics that DSE has not been
specially taught about, using a matrix store as an example here.

There is an interesting test change for invariant.start, but I
believe that optimization is correct. It only looks a bit odd
because the code is immediate UB anyway.

Differential Revision: https://reviews.llvm.org/D116210
2021-12-24 09:29:57 +01:00

782 lines
27 KiB
LLVM
Raw Blame History

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -basic-aa -dse -S | FileCheck %s
; RUN: opt < %s -aa-pipeline=basic-aa -passes=dse -S | FileCheck %s
target datalayout = "E-p:64:64:64-a0:0:8-f32:32:32-f64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-v64:64:64-v128:128:128"
declare void @llvm.memset.p0i8.i64(i8* nocapture, i8, i64, i1) nounwind
declare void @llvm.memset.element.unordered.atomic.p0i8.i64(i8* nocapture, i8, i64, i32) nounwind
declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture, i8* nocapture, i64, i1) nounwind
declare void @llvm.memcpy.element.unordered.atomic.p0i8.p0i8.i64(i8* nocapture, i8* nocapture, i64, i32) nounwind
declare void @llvm.init.trampoline(i8*, i8*, i8*)
declare void @llvm.matrix.column.major.store(<6 x float>, float*, i64, i1, i32, i32)
define void @test1(i32* %Q, i32* %P) {
; CHECK-LABEL: @test1(
; CHECK-NEXT: store i32 0, i32* [[P:%.*]], align 4
; CHECK-NEXT: ret void
;
%DEAD = load i32, i32* %Q
store i32 %DEAD, i32* %P
store i32 0, i32* %P
ret void
}
; PR8677
@g = global i32 1
define i32 @test3(i32* %g_addr) nounwind {
; CHECK-LABEL: @test3(
; CHECK-NEXT: [[G_VALUE:%.*]] = load i32, i32* [[G_ADDR:%.*]], align 4
; CHECK-NEXT: store i32 -1, i32* @g, align 4
; CHECK-NEXT: store i32 [[G_VALUE]], i32* [[G_ADDR]], align 4
; CHECK-NEXT: [[TMP3:%.*]] = load i32, i32* @g, align 4
; CHECK-NEXT: ret i32 [[TMP3]]
;
%g_value = load i32, i32* %g_addr, align 4
store i32 -1, i32* @g, align 4
store i32 %g_value, i32* %g_addr, align 4
%tmp3 = load i32, i32* @g, align 4
ret i32 %tmp3
}
define void @test4(i32* %Q) {
; CHECK-LABEL: @test4(
; CHECK-NEXT: [[A:%.*]] = load i32, i32* [[Q:%.*]], align 4
; CHECK-NEXT: store volatile i32 [[A]], i32* [[Q]], align 4
; CHECK-NEXT: ret void
;
%a = load i32, i32* %Q
store volatile i32 %a, i32* %Q
ret void
}
; PR8576 - Should delete store of 10 even though p/q are may aliases.
define void @test2(i32 *%p, i32 *%q) {
; CHECK-LABEL: @test2(
; CHECK-NEXT: store i32 20, i32* [[Q:%.*]], align 4
; CHECK-NEXT: store i32 30, i32* [[P:%.*]], align 4
; CHECK-NEXT: ret void
;
store i32 10, i32* %p, align 4
store i32 20, i32* %q, align 4
store i32 30, i32* %p, align 4
ret void
}
; Should delete store of 10 even though memset is a may-store to P (P and Q may
; alias).
define void @test6(i32 *%p, i8 *%q) {
; CHECK-LABEL: @test6(
; CHECK-NEXT: call void @llvm.memset.p0i8.i64(i8* [[Q:%.*]], i8 42, i64 900, i1 false)
; CHECK-NEXT: store i32 30, i32* [[P:%.*]], align 4
; CHECK-NEXT: ret void
;
store i32 10, i32* %p, align 4 ;; dead.
call void @llvm.memset.p0i8.i64(i8* %q, i8 42, i64 900, i1 false)
store i32 30, i32* %p, align 4
ret void
}
; Should delete store of 10 even though memset is a may-store to P (P and Q may
; alias).
define void @test6_atomic(i32* align 4 %p, i8* align 4 %q) {
; CHECK-LABEL: @test6_atomic(
; CHECK-NEXT: call void @llvm.memset.element.unordered.atomic.p0i8.i64(i8* align 4 [[Q:%.*]], i8 42, i64 900, i32 4)
; CHECK-NEXT: store atomic i32 30, i32* [[P:%.*]] unordered, align 4
; CHECK-NEXT: ret void
;
store atomic i32 10, i32* %p unordered, align 4 ;; dead.
call void @llvm.memset.element.unordered.atomic.p0i8.i64(i8* align 4 %q, i8 42, i64 900, i32 4)
store atomic i32 30, i32* %p unordered, align 4
ret void
}
; Should delete store of 10 even though memcpy is a may-store to P (P and Q may
; alias).
define void @test7(i32 *%p, i8 *%q, i8* noalias %r) {
; CHECK-LABEL: @test7(
; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i64(i8* [[Q:%.*]], i8* [[R:%.*]], i64 900, i1 false)
; CHECK-NEXT: store i32 30, i32* [[P:%.*]], align 4
; CHECK-NEXT: ret void
;
store i32 10, i32* %p, align 4 ;; dead.
call void @llvm.memcpy.p0i8.p0i8.i64(i8* %q, i8* %r, i64 900, i1 false)
store i32 30, i32* %p, align 4
ret void
}
; Should delete store of 10 even though memcpy is a may-store to P (P and Q may
; alias).
define void @test7_atomic(i32* align 4 %p, i8* align 4 %q, i8* noalias align 4 %r) {
; CHECK-LABEL: @test7_atomic(
; CHECK-NEXT: call void @llvm.memcpy.element.unordered.atomic.p0i8.p0i8.i64(i8* align 4 [[Q:%.*]], i8* align 4 [[R:%.*]], i64 900, i32 4)
; CHECK-NEXT: store atomic i32 30, i32* [[P:%.*]] unordered, align 4
; CHECK-NEXT: ret void
;
store atomic i32 10, i32* %p unordered, align 4 ;; dead.
call void @llvm.memcpy.element.unordered.atomic.p0i8.p0i8.i64(i8* align 4 %q, i8* align 4 %r, i64 900, i32 4)
store atomic i32 30, i32* %p unordered, align 4
ret void
}
; Do not delete stores that are only partially killed.
define i32 @test8() {
; CHECK-LABEL: @test8(
; CHECK-NEXT: [[V:%.*]] = alloca i32, align 4
; CHECK-NEXT: store i32 1234567, i32* [[V]], align 4
; CHECK-NEXT: [[X:%.*]] = load i32, i32* [[V]], align 4
; CHECK-NEXT: ret i32 [[X]]
;
%V = alloca i32
store i32 1234567, i32* %V
%V2 = bitcast i32* %V to i8*
store i8 0, i8* %V2
%X = load i32, i32* %V
ret i32 %X
}
; Test for byval handling.
%struct.x = type { i32, i32, i32, i32 }
define void @test9(%struct.x* byval(%struct.x) %a) nounwind {
; CHECK-LABEL: @test9(
; CHECK-NEXT: ret void
;
%tmp2 = getelementptr %struct.x, %struct.x* %a, i32 0, i32 0
store i32 1, i32* %tmp2, align 4
ret void
}
; Test for inalloca handling.
define void @test9_2(%struct.x* inalloca(%struct.x) %a) nounwind {
; CHECK-LABEL: @test9_2(
; CHECK-NEXT: ret void
;
%tmp2 = getelementptr %struct.x, %struct.x* %a, i32 0, i32 0
store i32 1, i32* %tmp2, align 4
ret void
}
; Test for preallocated handling.
define void @test9_3(%struct.x* preallocated(%struct.x) %a) nounwind {
; CHECK-LABEL: @test9_3(
; CHECK-NEXT: ret void
;
%tmp2 = getelementptr %struct.x, %struct.x* %a, i32 0, i32 0
store i32 1, i32* %tmp2, align 4
ret void
}
; va_arg has fuzzy dependence, the store shouldn't be zapped.
define double @test10(i8* %X) {
; CHECK-LABEL: @test10(
; CHECK-NEXT: [[X_ADDR:%.*]] = alloca i8*, align 8
; CHECK-NEXT: store i8* [[X:%.*]], i8** [[X_ADDR]], align 8
; CHECK-NEXT: [[TMP_0:%.*]] = va_arg i8** [[X_ADDR]], double
; CHECK-NEXT: ret double [[TMP_0]]
;
%X_addr = alloca i8*
store i8* %X, i8** %X_addr
%tmp.0 = va_arg i8** %X_addr, double
ret double %tmp.0
}
; DSE should delete the dead trampoline.
declare void @test11f()
define void @test11() {
; CHECK-LABEL: @test11(
; CHECK-NEXT: ret void
;
%storage = alloca [10 x i8], align 16 ; <[10 x i8]*> [#uses=1]
%cast = getelementptr [10 x i8], [10 x i8]* %storage, i32 0, i32 0 ; <i8*> [#uses=1]
call void @llvm.init.trampoline( i8* %cast, i8* bitcast (void ()* @test11f to i8*), i8* null ) ; <i8*> [#uses=1]
ret void
}
; Specialized store intrinsics should be removed if dead.
define void @test_matrix_store(i64 %stride) {
; CHECK-LABEL: @test_matrix_store(
; CHECK-NEXT: ret void
;
%a = alloca [6 x float]
%cast = bitcast [6 x float]* %a to float*
call void @llvm.matrix.column.major.store(<6 x float> zeroinitializer, float* %cast, i64 %stride, i1 false, i32 3, i32 2)
ret void
}
; %P doesn't escape, the DEAD instructions should be removed.
declare void @test13f()
define i32* @test13() {
; CHECK-LABEL: @test13(
; CHECK-NEXT: [[PTR:%.*]] = tail call i8* @malloc(i32 4)
; CHECK-NEXT: [[P:%.*]] = bitcast i8* [[PTR]] to i32*
; CHECK-NEXT: call void @test13f()
; CHECK-NEXT: store i32 0, i32* [[P]], align 4
; CHECK-NEXT: ret i32* [[P]]
;
%ptr = tail call i8* @malloc(i32 4)
%P = bitcast i8* %ptr to i32*
%DEAD = load i32, i32* %P
%DEAD2 = add i32 %DEAD, 1
store i32 %DEAD2, i32* %P
call void @test13f( )
store i32 0, i32* %P
ret i32* %P
}
define i32 addrspace(1)* @test13_addrspacecast() {
; CHECK-LABEL: @test13_addrspacecast(
; CHECK-NEXT: [[P:%.*]] = tail call i8* @malloc(i32 4)
; CHECK-NEXT: [[P_BC:%.*]] = bitcast i8* [[P]] to i32*
; CHECK-NEXT: [[P:%.*]] = addrspacecast i32* [[P_BC]] to i32 addrspace(1)*
; CHECK-NEXT: call void @test13f()
; CHECK-NEXT: store i32 0, i32 addrspace(1)* [[P]], align 4
; CHECK-NEXT: ret i32 addrspace(1)* [[P]]
;
%p = tail call i8* @malloc(i32 4)
%p.bc = bitcast i8* %p to i32*
%P = addrspacecast i32* %p.bc to i32 addrspace(1)*
%DEAD = load i32, i32 addrspace(1)* %P
%DEAD2 = add i32 %DEAD, 1
store i32 %DEAD2, i32 addrspace(1)* %P
call void @test13f( )
store i32 0, i32 addrspace(1)* %P
ret i32 addrspace(1)* %P
}
declare noalias i8* @malloc(i32) willreturn
declare noalias i8* @calloc(i32, i32) willreturn
define void @test14(i32* %Q) {
; CHECK-LABEL: @test14(
; CHECK-NEXT: ret void
;
%P = alloca i32
%DEAD = load i32, i32* %Q
store i32 %DEAD, i32* %P
ret void
}
; The store here is not dead because the byval call reads it.
declare void @test19f({i32}* byval({i32}) align 4 %P)
define void @test19({i32}* nocapture byval({i32}) align 4 %arg5) nounwind ssp {
; CHECK-LABEL: @test19(
; CHECK-NEXT: bb:
; CHECK-NEXT: [[TMP7:%.*]] = getelementptr inbounds { i32 }, { i32 }* [[ARG5:%.*]], i32 0, i32 0
; CHECK-NEXT: store i32 912, i32* [[TMP7]], align 4
; CHECK-NEXT: call void @test19f({ i32 }* byval({ i32 }) align 4 [[ARG5]])
; CHECK-NEXT: ret void
;
bb:
%tmp7 = getelementptr inbounds {i32}, {i32}* %arg5, i32 0, i32 0
store i32 912, i32* %tmp7
call void @test19f({i32}* byval({i32}) align 4 %arg5)
ret void
}
define void @test20() {
; CHECK-LABEL: @test20(
; CHECK-NEXT: ret void
;
%m = call i8* @malloc(i32 24)
store i8 0, i8* %m
ret void
}
define void @test21() {
; CHECK-LABEL: @test21(
; CHECK-NEXT: ret void
;
%m = call i8* @calloc(i32 9, i32 7)
store i8 0, i8* %m
ret void
}
; Currently elimination of stores at the end of a function is limited to a
; single underlying object, for compile-time. This case appears to not be
; very important in practice.
define void @test22(i1 %i, i32 %k, i32 %m) nounwind {
; CHECK-LABEL: @test22(
; CHECK-NEXT: [[K_ADDR:%.*]] = alloca i32, align 4
; CHECK-NEXT: [[M_ADDR:%.*]] = alloca i32, align 4
; CHECK-NEXT: [[K_ADDR_M_ADDR:%.*]] = select i1 [[I:%.*]], i32* [[K_ADDR]], i32* [[M_ADDR]]
; CHECK-NEXT: store i32 0, i32* [[K_ADDR_M_ADDR]], align 4
; CHECK-NEXT: ret void
;
%k.addr = alloca i32
%m.addr = alloca i32
%k.addr.m.addr = select i1 %i, i32* %k.addr, i32* %m.addr
store i32 0, i32* %k.addr.m.addr, align 4
ret void
}
; PR13547
declare noalias i8* @strdup(i8* nocapture) nounwind
define noalias i8* @test23() nounwind uwtable ssp {
; CHECK-LABEL: @test23(
; CHECK-NEXT: [[X:%.*]] = alloca [2 x i8], align 1
; CHECK-NEXT: [[ARRAYIDX:%.*]] = getelementptr inbounds [2 x i8], [2 x i8]* [[X]], i64 0, i64 0
; CHECK-NEXT: store i8 97, i8* [[ARRAYIDX]], align 1
; CHECK-NEXT: [[ARRAYIDX1:%.*]] = getelementptr inbounds [2 x i8], [2 x i8]* [[X]], i64 0, i64 1
; CHECK-NEXT: store i8 0, i8* [[ARRAYIDX1]], align 1
; CHECK-NEXT: [[CALL:%.*]] = call i8* @strdup(i8* [[ARRAYIDX]]) #[[ATTR5:[0-9]+]]
; CHECK-NEXT: ret i8* [[CALL]]
;
%x = alloca [2 x i8], align 1
%arrayidx = getelementptr inbounds [2 x i8], [2 x i8]* %x, i64 0, i64 0
store i8 97, i8* %arrayidx, align 1
%arrayidx1 = getelementptr inbounds [2 x i8], [2 x i8]* %x, i64 0, i64 1
store i8 0, i8* %arrayidx1, align 1
%call = call i8* @strdup(i8* %arrayidx) nounwind
ret i8* %call
}
; Make sure same sized store to later element is deleted
define void @test24([2 x i32]* %a, i32 %b, i32 %c) nounwind {
; CHECK-LABEL: @test24(
; CHECK-NEXT: [[TMP1:%.*]] = getelementptr inbounds [2 x i32], [2 x i32]* [[A:%.*]], i64 0, i64 0
; CHECK-NEXT: store i32 [[B:%.*]], i32* [[TMP1]], align 4
; CHECK-NEXT: [[TMP2:%.*]] = getelementptr inbounds [2 x i32], [2 x i32]* [[A]], i64 0, i64 1
; CHECK-NEXT: store i32 [[C:%.*]], i32* [[TMP2]], align 4
; CHECK-NEXT: ret void
;
%1 = getelementptr inbounds [2 x i32], [2 x i32]* %a, i64 0, i64 0
store i32 0, i32* %1, align 4
%2 = getelementptr inbounds [2 x i32], [2 x i32]* %a, i64 0, i64 1
store i32 0, i32* %2, align 4
%3 = getelementptr inbounds [2 x i32], [2 x i32]* %a, i64 0, i64 0
store i32 %b, i32* %3, align 4
%4 = getelementptr inbounds [2 x i32], [2 x i32]* %a, i64 0, i64 1
store i32 %c, i32* %4, align 4
ret void
}
; Check another case like PR13547 where strdup is not like malloc.
define i8* @test25(i8* %p) nounwind {
; CHECK-LABEL: @test25(
; CHECK-NEXT: [[P_4:%.*]] = getelementptr i8, i8* [[P:%.*]], i64 4
; CHECK-NEXT: [[TMP:%.*]] = load i8, i8* [[P_4]], align 1
; CHECK-NEXT: store i8 0, i8* [[P_4]], align 1
; CHECK-NEXT: [[Q:%.*]] = call i8* @strdup(i8* [[P]]) #[[ATTR10:[0-9]+]]
; CHECK-NEXT: store i8 [[TMP]], i8* [[P_4]], align 1
; CHECK-NEXT: ret i8* [[Q]]
;
%p.4 = getelementptr i8, i8* %p, i64 4
%tmp = load i8, i8* %p.4, align 1
store i8 0, i8* %p.4, align 1
%q = call i8* @strdup(i8* %p) nounwind optsize
store i8 %tmp, i8* %p.4, align 1
ret i8* %q
}
; Don't remove redundant store because of may-aliased store.
define i32 @test28(i1 %c, i32* %p, i32* %p2, i32 %i) {
; CHECK-LABEL: @test28(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[V:%.*]] = load i32, i32* [[P:%.*]], align 4
; CHECK-NEXT: store i32 [[I:%.*]], i32* [[P2:%.*]], align 4
; CHECK-NEXT: br i1 [[C:%.*]], label [[BB1:%.*]], label [[BB2:%.*]]
; CHECK: bb1:
; CHECK-NEXT: br label [[BB3:%.*]]
; CHECK: bb2:
; CHECK-NEXT: br label [[BB3]]
; CHECK: bb3:
; CHECK-NEXT: store i32 [[V]], i32* [[P]], align 4
; CHECK-NEXT: ret i32 0
;
entry:
%v = load i32, i32* %p, align 4
; Might overwrite value at %p
store i32 %i, i32* %p2, align 4
br i1 %c, label %bb1, label %bb2
bb1:
br label %bb3
bb2:
br label %bb3
bb3:
store i32 %v, i32* %p, align 4
ret i32 0
}
; Don't remove redundant store because of may-aliased store.
define i32 @test29(i1 %c, i32* %p, i32* %p2, i32 %i) {
; CHECK-LABEL: @test29(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[V:%.*]] = load i32, i32* [[P:%.*]], align 4
; CHECK-NEXT: br i1 [[C:%.*]], label [[BB1:%.*]], label [[BB2:%.*]]
; CHECK: bb1:
; CHECK-NEXT: br label [[BB3:%.*]]
; CHECK: bb2:
; CHECK-NEXT: store i32 [[I:%.*]], i32* [[P2:%.*]], align 4
; CHECK-NEXT: br label [[BB3]]
; CHECK: bb3:
; CHECK-NEXT: store i32 [[V]], i32* [[P]], align 4
; CHECK-NEXT: ret i32 0
;
entry:
%v = load i32, i32* %p, align 4
br i1 %c, label %bb1, label %bb2
bb1:
br label %bb3
bb2:
; Might overwrite value at %p
store i32 %i, i32* %p2, align 4
br label %bb3
bb3:
store i32 %v, i32* %p, align 4
ret i32 0
}
declare void @unknown_func()
; Don't remove redundant store because of unknown call.
define i32 @test30(i1 %c, i32* %p, i32 %i) {
; CHECK-LABEL: @test30(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[V:%.*]] = load i32, i32* [[P:%.*]], align 4
; CHECK-NEXT: br i1 [[C:%.*]], label [[BB1:%.*]], label [[BB2:%.*]]
; CHECK: bb1:
; CHECK-NEXT: br label [[BB3:%.*]]
; CHECK: bb2:
; CHECK-NEXT: call void @unknown_func()
; CHECK-NEXT: br label [[BB3]]
; CHECK: bb3:
; CHECK-NEXT: store i32 [[V]], i32* [[P]], align 4
; CHECK-NEXT: ret i32 0
;
entry:
%v = load i32, i32* %p, align 4
br i1 %c, label %bb1, label %bb2
bb1:
br label %bb3
bb2:
; Might overwrite value at %p
call void @unknown_func()
br label %bb3
bb3:
store i32 %v, i32* %p, align 4
ret i32 0
}
; Don't remove redundant store in a loop with a may-alias store.
define i32 @test32(i1 %c, i32* %p, i32 %i) {
; CHECK-LABEL: @test32(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[V:%.*]] = load i32, i32* [[P:%.*]], align 4
; CHECK-NEXT: br label [[BB1:%.*]]
; CHECK: bb1:
; CHECK-NEXT: store i32 [[V]], i32* [[P]], align 4
; CHECK-NEXT: call void @unknown_func()
; CHECK-NEXT: br i1 undef, label [[BB1]], label [[BB2:%.*]]
; CHECK: bb2:
; CHECK-NEXT: ret i32 0
;
entry:
%v = load i32, i32* %p, align 4
br label %bb1
bb1:
store i32 %v, i32* %p, align 4
; Might read and overwrite value at %p
call void @unknown_func()
br i1 undef, label %bb1, label %bb2
bb2:
ret i32 0
}
; We cannot remove any stores, because @unknown_func may unwind and the caller
; may read %p while unwinding.
define void @test34(i32* noalias %p) {
; CHECK-LABEL: @test34(
; CHECK-NEXT: store i32 1, i32* [[P:%.*]], align 4
; CHECK-NEXT: call void @unknown_func()
; CHECK-NEXT: store i32 0, i32* [[P]], align 4
; CHECK-NEXT: ret void
;
store i32 1, i32* %p
call void @unknown_func()
store i32 0, i32* %p
ret void
}
; Remove redundant store even with an unwinding function in the same block
define void @test35(i32* noalias %p) {
; CHECK-LABEL: @test35(
; CHECK-NEXT: call void @unknown_func()
; CHECK-NEXT: store i32 0, i32* [[P:%.*]], align 4
; CHECK-NEXT: ret void
;
call void @unknown_func()
store i32 1, i32* %p
store i32 0, i32* %p
ret void
}
; We cannot optimize away the first memmove since %P could overlap with %Q.
define void @test36(i8* %P, i8* %Q) {
; CHECK-LABEL: @test36(
; CHECK-NEXT: tail call void @llvm.memmove.p0i8.p0i8.i64(i8* [[P:%.*]], i8* [[Q:%.*]], i64 12, i1 false)
; CHECK-NEXT: tail call void @llvm.memmove.p0i8.p0i8.i64(i8* [[P]], i8* [[Q]], i64 12, i1 false)
; CHECK-NEXT: ret void
;
tail call void @llvm.memmove.p0i8.p0i8.i64(i8* %P, i8* %Q, i64 12, i1 false)
tail call void @llvm.memmove.p0i8.p0i8.i64(i8* %P, i8* %Q, i64 12, i1 false)
ret void
}
define void @test36_atomic(i8* %P, i8* %Q) {
; CHECK-LABEL: @test36_atomic(
; CHECK-NEXT: tail call void @llvm.memmove.element.unordered.atomic.p0i8.p0i8.i64(i8* align 1 [[P:%.*]], i8* align 1 [[Q:%.*]], i64 12, i32 1)
; CHECK-NEXT: tail call void @llvm.memmove.element.unordered.atomic.p0i8.p0i8.i64(i8* align 1 [[P]], i8* align 1 [[Q]], i64 12, i32 1)
; CHECK-NEXT: ret void
;
tail call void @llvm.memmove.element.unordered.atomic.p0i8.p0i8.i64(i8* align 1 %P, i8* align 1 %Q, i64 12, i32 1)
tail call void @llvm.memmove.element.unordered.atomic.p0i8.p0i8.i64(i8* align 1 %P, i8* align 1 %Q, i64 12, i32 1)
ret void
}
define void @test37(i8* %P, i8* %Q, i8* %R) {
; CHECK-LABEL: @test37(
; CHECK-NEXT: tail call void @llvm.memcpy.p0i8.p0i8.i64(i8* [[P:%.*]], i8* [[Q:%.*]], i64 12, i1 false)
; CHECK-NEXT: tail call void @llvm.memmove.p0i8.p0i8.i64(i8* [[P]], i8* [[R:%.*]], i64 12, i1 false)
; CHECK-NEXT: ret void
;
tail call void @llvm.memcpy.p0i8.p0i8.i64(i8* %P, i8* %Q, i64 12, i1 false)
tail call void @llvm.memmove.p0i8.p0i8.i64(i8* %P, i8* %R, i64 12, i1 false)
ret void
}
define void @test37_atomic(i8* %P, i8* %Q, i8* %R) {
; CHECK-LABEL: @test37_atomic(
; CHECK-NEXT: tail call void @llvm.memcpy.element.unordered.atomic.p0i8.p0i8.i64(i8* align 1 [[P:%.*]], i8* align 1 [[Q:%.*]], i64 12, i32 1)
; CHECK-NEXT: tail call void @llvm.memmove.element.unordered.atomic.p0i8.p0i8.i64(i8* align 1 [[P]], i8* align 1 [[R:%.*]], i64 12, i32 1)
; CHECK-NEXT: ret void
;
tail call void @llvm.memcpy.element.unordered.atomic.p0i8.p0i8.i64(i8* align 1 %P, i8* align 1 %Q, i64 12, i32 1)
tail call void @llvm.memmove.element.unordered.atomic.p0i8.p0i8.i64(i8* align 1 %P, i8* align 1 %R, i64 12, i32 1)
ret void
}
; See PR11763 - LLVM allows memcpy's source and destination to be equal (but not
; inequal and overlapping).
define void @test38(i8* %P, i8* %Q, i8* %R) {
; CHECK-LABEL: @test38(
; CHECK-NEXT: tail call void @llvm.memmove.p0i8.p0i8.i64(i8* [[P:%.*]], i8* [[Q:%.*]], i64 12, i1 false)
; CHECK-NEXT: tail call void @llvm.memcpy.p0i8.p0i8.i64(i8* [[P]], i8* [[R:%.*]], i64 12, i1 false)
; CHECK-NEXT: ret void
;
tail call void @llvm.memmove.p0i8.p0i8.i64(i8* %P, i8* %Q, i64 12, i1 false)
tail call void @llvm.memcpy.p0i8.p0i8.i64(i8* %P, i8* %R, i64 12, i1 false)
ret void
}
; See PR11763 - LLVM allows memcpy's source and destination to be equal (but not
; inequal and overlapping).
define void @test38_atomic(i8* %P, i8* %Q, i8* %R) {
; CHECK-LABEL: @test38_atomic(
; CHECK-NEXT: tail call void @llvm.memmove.element.unordered.atomic.p0i8.p0i8.i64(i8* align 1 [[P:%.*]], i8* align 1 [[Q:%.*]], i64 12, i32 1)
; CHECK-NEXT: tail call void @llvm.memcpy.element.unordered.atomic.p0i8.p0i8.i64(i8* align 1 [[P]], i8* align 1 [[R:%.*]], i64 12, i32 1)
; CHECK-NEXT: ret void
;
tail call void @llvm.memmove.element.unordered.atomic.p0i8.p0i8.i64(i8* align 1 %P, i8* align 1 %Q, i64 12, i32 1)
tail call void @llvm.memcpy.element.unordered.atomic.p0i8.p0i8.i64(i8* align 1 %P, i8* align 1 %R, i64 12, i32 1)
ret void
}
define void @test39(i8* %P, i8* %Q, i8* %R) {
; CHECK-LABEL: @test39(
; CHECK-NEXT: tail call void @llvm.memcpy.p0i8.p0i8.i64(i8* [[P:%.*]], i8* [[Q:%.*]], i64 12, i1 false)
; CHECK-NEXT: tail call void @llvm.memcpy.p0i8.p0i8.i64(i8* [[P]], i8* [[R:%.*]], i64 8, i1 false)
; CHECK-NEXT: ret void
;
tail call void @llvm.memcpy.p0i8.p0i8.i64(i8* %P, i8* %Q, i64 12, i1 false)
tail call void @llvm.memcpy.p0i8.p0i8.i64(i8* %P, i8* %R, i64 8, i1 false)
ret void
}
define void @test39_atomic(i8* %P, i8* %Q, i8* %R) {
; CHECK-LABEL: @test39_atomic(
; CHECK-NEXT: tail call void @llvm.memcpy.element.unordered.atomic.p0i8.p0i8.i64(i8* align 1 [[P:%.*]], i8* align 1 [[Q:%.*]], i64 12, i32 1)
; CHECK-NEXT: tail call void @llvm.memcpy.element.unordered.atomic.p0i8.p0i8.i64(i8* align 1 [[P]], i8* align 1 [[R:%.*]], i64 8, i32 1)
; CHECK-NEXT: ret void
;
tail call void @llvm.memcpy.element.unordered.atomic.p0i8.p0i8.i64(i8* align 1 %P, i8* align 1 %Q, i64 12, i32 1)
tail call void @llvm.memcpy.element.unordered.atomic.p0i8.p0i8.i64(i8* align 1 %P, i8* align 1 %R, i64 8, i32 1)
ret void
}
declare void @llvm.memmove.p0i8.p0i8.i64(i8* nocapture, i8* nocapture readonly, i64, i1)
declare void @llvm.memmove.element.unordered.atomic.p0i8.p0i8.i64(i8* nocapture, i8* nocapture readonly, i64, i32)
declare void @llvm.lifetime.start.p0i8(i64, i8* nocapture) nounwind
declare void @llvm.lifetime.end.p0i8(i64, i8* nocapture) nounwind
define void @test40(i32** noalias %Pp, i32* noalias %Q) {
; CHECK-LABEL: @test40(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[A:%.*]] = alloca i32, align 4
; CHECK-NEXT: [[AC:%.*]] = bitcast i32* [[A]] to i8*
; CHECK-NEXT: call void @llvm.lifetime.start.p0i8(i64 4, i8* nonnull [[AC]])
; CHECK-NEXT: [[TMP0:%.*]] = bitcast i32** [[PP:%.*]] to i8**
; CHECK-NEXT: [[PC:%.*]] = load i8*, i8** [[TMP0]], align 8
; CHECK-NEXT: [[QC:%.*]] = bitcast i32* [[Q:%.*]] to i8*
; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i64(i8* nonnull align 4 [[AC]], i8* align 4 [[QC]], i64 4, i1 false)
; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 4 [[PC]], i8* nonnull align 4 [[AC]], i64 4, i1 true)
; CHECK-NEXT: call void @llvm.lifetime.end.p0i8(i64 4, i8* nonnull [[AC]])
; CHECK-NEXT: ret void
;
entry:
%A = alloca i32, align 4
%Ac = bitcast i32* %A to i8*
call void @llvm.lifetime.start.p0i8(i64 4, i8* nonnull %Ac)
%0 = bitcast i32** %Pp to i8**
%Pc = load i8*, i8** %0, align 8
%Qc = bitcast i32* %Q to i8*
call void @llvm.memcpy.p0i8.p0i8.i64(i8* nonnull align 4 %Ac, i8* align 4 %Qc, i64 4, i1 false)
call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 4 %Pc, i8* nonnull align 4 %Ac, i64 4, i1 true)
call void @llvm.lifetime.end.p0i8(i64 4, i8* nonnull %Ac)
ret void
}
declare void @free(i8* nocapture)
; We cannot remove `store i32 1, i32* %p`, because @unknown_func may unwind
; and the caller may read %p while unwinding.
define void @test41(i32* noalias %P) {
; CHECK-LABEL: @test41(
; CHECK-NEXT: [[P2:%.*]] = bitcast i32* [[P:%.*]] to i8*
; CHECK-NEXT: store i32 1, i32* [[P]], align 4
; CHECK-NEXT: call void @unknown_func()
; CHECK-NEXT: call void @free(i8* [[P2]])
; CHECK-NEXT: ret void
;
%P2 = bitcast i32* %P to i8*
store i32 1, i32* %P
call void @unknown_func()
store i32 2, i32* %P
call void @free(i8* %P2)
ret void
}
define void @test42(i32* %P, i32* %Q) {
; CHECK-LABEL: @test42(
; CHECK-NEXT: store i32 1, i32* [[P:%.*]], align 4
; CHECK-NEXT: [[P2:%.*]] = bitcast i32* [[P]] to i8*
; CHECK-NEXT: store i32 2, i32* [[Q:%.*]], align 4
; CHECK-NEXT: store i8 3, i8* [[P2]], align 1
; CHECK-NEXT: ret void
;
store i32 1, i32* %P
%P2 = bitcast i32* %P to i8*
store i32 2, i32* %Q
store i8 3, i8* %P2
ret void
}
define void @test42a(i32* %P, i32* %Q) {
; CHECK-LABEL: @test42a(
; CHECK-NEXT: store atomic i32 1, i32* [[P:%.*]] unordered, align 4
; CHECK-NEXT: [[P2:%.*]] = bitcast i32* [[P]] to i8*
; CHECK-NEXT: store atomic i32 2, i32* [[Q:%.*]] unordered, align 4
; CHECK-NEXT: store atomic i8 3, i8* [[P2]] unordered, align 4
; CHECK-NEXT: ret void
;
store atomic i32 1, i32* %P unordered, align 4
%P2 = bitcast i32* %P to i8*
store atomic i32 2, i32* %Q unordered, align 4
store atomic i8 3, i8* %P2 unordered, align 4
ret void
}
define void @test43a(i32* %P, i32* noalias %Q) {
; CHECK-LABEL: @test43a(
; CHECK-NEXT: entry:
; CHECK-NEXT: store atomic i32 50331649, i32* [[P:%.*]] unordered, align 4
; CHECK-NEXT: store atomic i32 2, i32* [[Q:%.*]] unordered, align 4
; CHECK-NEXT: ret void
;
entry:
store atomic i32 1, i32* %P unordered, align 4
%P2 = bitcast i32* %P to i8*
store atomic i32 2, i32* %Q unordered, align 4
store atomic i8 3, i8* %P2 unordered, align 4
ret void
}
; Some tests where volatile may block removing a store.
; Here we can remove the first non-volatile store. We cannot remove the
; volatile store.
define void @test44_volatile(i32* %P) {
; CHECK-LABEL: @test44_volatile(
; CHECK-NEXT: store volatile i32 2, i32* [[P:%.*]], align 4
; CHECK-NEXT: store i32 3, i32* [[P]], align 4
; CHECK-NEXT: ret void
;
store i32 1, i32* %P, align 4
store volatile i32 2, i32* %P, align 4
store i32 3, i32* %P, align 4
ret void
}
define void @test45_volatile(i32* %P) {
; CHECK-LABEL: @test45_volatile(
; CHECK-NEXT: store volatile i32 2, i32* [[P:%.*]], align 4
; CHECK-NEXT: store volatile i32 3, i32* [[P]], align 4
; CHECK-NEXT: ret void
;
store i32 1, i32* %P, align 4
store volatile i32 2, i32* %P, align 4
store volatile i32 3, i32* %P, align 4
ret void
}
define void @test46_volatile(i32* %P) {
; CHECK-LABEL: @test46_volatile(
; CHECK-NEXT: store volatile i32 2, i32* [[P:%.*]], align 4
; CHECK-NEXT: store volatile i32 3, i32* [[P]], align 4
; CHECK-NEXT: ret void
;
store volatile i32 2, i32* %P, align 4
store i32 1, i32* %P, align 4
store volatile i32 3, i32* %P, align 4
ret void
}
define void @test47_volatile(i32* %P) {
; CHECK-LABEL: @test47_volatile(
; CHECK-NEXT: store volatile i32 2, i32* [[P:%.*]], align 4
; CHECK-NEXT: store volatile i32 3, i32* [[P]], align 4
; CHECK-NEXT: ret void
;
store volatile i32 2, i32* %P, align 4
store volatile i32 3, i32* %P, align 4
ret void
}
define i32 @test48(i32* %P, i32* noalias %Q, i32* %R) {
; CHECK-LABEL: @test48(
; CHECK-NEXT: store i32 2, i32* [[P:%.*]], align 4
; CHECK-NEXT: store i32 3, i32* [[Q:%.*]], align 4
; CHECK-NEXT: [[L:%.*]] = load i32, i32* [[R:%.*]], align 4
; CHECK-NEXT: ret i32 [[L]]
;
store i32 1, i32* %Q
store i32 2, i32* %P
store i32 3, i32* %Q
%l = load i32, i32* %R
ret i32 %l
}
Reference in New Issue View Git Blame Copy Permalink