forked from OSchip/llvm-project
430 lines
10 KiB
LLVM
430 lines
10 KiB
LLVM
; RUN: opt < %s -sroa -S | FileCheck %s
|
|
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-n8:16:32:64"
|
|
|
|
define i32 @test1() {
|
|
; CHECK: @test1
|
|
entry:
|
|
%a = alloca [2 x i32]
|
|
; CHECK-NOT: alloca
|
|
|
|
%a0 = getelementptr [2 x i32]* %a, i64 0, i32 0
|
|
%a1 = getelementptr [2 x i32]* %a, i64 0, i32 1
|
|
store i32 0, i32* %a0
|
|
store i32 1, i32* %a1
|
|
%v0 = load i32* %a0
|
|
%v1 = load i32* %a1
|
|
; CHECK-NOT: store
|
|
; CHECK-NOT: load
|
|
|
|
%cond = icmp sle i32 %v0, %v1
|
|
br i1 %cond, label %then, label %exit
|
|
|
|
then:
|
|
br label %exit
|
|
|
|
exit:
|
|
%phi = phi i32* [ %a1, %then ], [ %a0, %entry ]
|
|
; CHECK: phi i32 [ 1, %{{.*}} ], [ 0, %{{.*}} ]
|
|
|
|
%result = load i32* %phi
|
|
ret i32 %result
|
|
}
|
|
|
|
define i32 @test2() {
|
|
; CHECK: @test2
|
|
entry:
|
|
%a = alloca [2 x i32]
|
|
; CHECK-NOT: alloca
|
|
|
|
%a0 = getelementptr [2 x i32]* %a, i64 0, i32 0
|
|
%a1 = getelementptr [2 x i32]* %a, i64 0, i32 1
|
|
store i32 0, i32* %a0
|
|
store i32 1, i32* %a1
|
|
%v0 = load i32* %a0
|
|
%v1 = load i32* %a1
|
|
; CHECK-NOT: store
|
|
; CHECK-NOT: load
|
|
|
|
%cond = icmp sle i32 %v0, %v1
|
|
%select = select i1 %cond, i32* %a1, i32* %a0
|
|
; CHECK: select i1 %{{.*}}, i32 1, i32 0
|
|
|
|
%result = load i32* %select
|
|
ret i32 %result
|
|
}
|
|
|
|
define i32 @test3(i32 %x) {
|
|
; CHECK: @test3
|
|
entry:
|
|
%a = alloca [2 x i32]
|
|
; CHECK-NOT: alloca
|
|
|
|
; Note that we build redundant GEPs here to ensure that having different GEPs
|
|
; into the same alloca partation continues to work with PHI speculation. This
|
|
; was the underlying cause of PR13926.
|
|
%a0 = getelementptr [2 x i32]* %a, i64 0, i32 0
|
|
%a0b = getelementptr [2 x i32]* %a, i64 0, i32 0
|
|
%a1 = getelementptr [2 x i32]* %a, i64 0, i32 1
|
|
%a1b = getelementptr [2 x i32]* %a, i64 0, i32 1
|
|
store i32 0, i32* %a0
|
|
store i32 1, i32* %a1
|
|
; CHECK-NOT: store
|
|
|
|
switch i32 %x, label %bb0 [ i32 1, label %bb1
|
|
i32 2, label %bb2
|
|
i32 3, label %bb3
|
|
i32 4, label %bb4
|
|
i32 5, label %bb5
|
|
i32 6, label %bb6
|
|
i32 7, label %bb7 ]
|
|
|
|
bb0:
|
|
br label %exit
|
|
bb1:
|
|
br label %exit
|
|
bb2:
|
|
br label %exit
|
|
bb3:
|
|
br label %exit
|
|
bb4:
|
|
br label %exit
|
|
bb5:
|
|
br label %exit
|
|
bb6:
|
|
br label %exit
|
|
bb7:
|
|
br label %exit
|
|
|
|
exit:
|
|
%phi = phi i32* [ %a1, %bb0 ], [ %a0, %bb1 ], [ %a0, %bb2 ], [ %a1, %bb3 ],
|
|
[ %a1b, %bb4 ], [ %a0b, %bb5 ], [ %a0b, %bb6 ], [ %a1b, %bb7 ]
|
|
; CHECK: phi i32 [ 1, %{{.*}} ], [ 0, %{{.*}} ], [ 0, %{{.*}} ], [ 1, %{{.*}} ], [ 1, %{{.*}} ], [ 0, %{{.*}} ], [ 0, %{{.*}} ], [ 1, %{{.*}} ]
|
|
|
|
%result = load i32* %phi
|
|
ret i32 %result
|
|
}
|
|
|
|
define i32 @test4() {
|
|
; CHECK: @test4
|
|
entry:
|
|
%a = alloca [2 x i32]
|
|
; CHECK-NOT: alloca
|
|
|
|
%a0 = getelementptr [2 x i32]* %a, i64 0, i32 0
|
|
%a1 = getelementptr [2 x i32]* %a, i64 0, i32 1
|
|
store i32 0, i32* %a0
|
|
store i32 1, i32* %a1
|
|
%v0 = load i32* %a0
|
|
%v1 = load i32* %a1
|
|
; CHECK-NOT: store
|
|
; CHECK-NOT: load
|
|
|
|
%cond = icmp sle i32 %v0, %v1
|
|
%select = select i1 %cond, i32* %a0, i32* %a0
|
|
; CHECK-NOT: select
|
|
|
|
%result = load i32* %select
|
|
ret i32 %result
|
|
; CHECK: ret i32 0
|
|
}
|
|
|
|
define i32 @test5(i32* %b) {
|
|
; CHECK: @test5
|
|
entry:
|
|
%a = alloca [2 x i32]
|
|
; CHECK-NOT: alloca
|
|
|
|
%a1 = getelementptr [2 x i32]* %a, i64 0, i32 1
|
|
store i32 1, i32* %a1
|
|
; CHECK-NOT: store
|
|
|
|
%select = select i1 true, i32* %a1, i32* %b
|
|
; CHECK-NOT: select
|
|
|
|
%result = load i32* %select
|
|
; CHECK-NOT: load
|
|
|
|
ret i32 %result
|
|
; CHECK: ret i32 1
|
|
}
|
|
|
|
declare void @f(i32*, i32*)
|
|
|
|
define i32 @test6(i32* %b) {
|
|
; CHECK: @test6
|
|
entry:
|
|
%a = alloca [2 x i32]
|
|
%c = alloca i32
|
|
; CHECK-NOT: alloca
|
|
|
|
%a1 = getelementptr [2 x i32]* %a, i64 0, i32 1
|
|
store i32 1, i32* %a1
|
|
|
|
%select = select i1 true, i32* %a1, i32* %b
|
|
%select2 = select i1 false, i32* %a1, i32* %b
|
|
%select3 = select i1 false, i32* %c, i32* %b
|
|
; CHECK: %[[select2:.*]] = select i1 false, i32* undef, i32* %b
|
|
; CHECK: %[[select3:.*]] = select i1 false, i32* undef, i32* %b
|
|
|
|
; Note, this would potentially escape the alloca pointer except for the
|
|
; constant folding of the select.
|
|
call void @f(i32* %select2, i32* %select3)
|
|
; CHECK: call void @f(i32* %[[select2]], i32* %[[select3]])
|
|
|
|
|
|
%result = load i32* %select
|
|
; CHECK-NOT: load
|
|
|
|
%dead = load i32* %c
|
|
|
|
ret i32 %result
|
|
; CHECK: ret i32 1
|
|
}
|
|
|
|
define i32 @test7() {
|
|
; CHECK: @test7
|
|
; CHECK-NOT: alloca
|
|
|
|
entry:
|
|
%X = alloca i32
|
|
br i1 undef, label %good, label %bad
|
|
|
|
good:
|
|
%Y1 = getelementptr i32* %X, i64 0
|
|
store i32 0, i32* %Y1
|
|
br label %exit
|
|
|
|
bad:
|
|
%Y2 = getelementptr i32* %X, i64 1
|
|
store i32 0, i32* %Y2
|
|
br label %exit
|
|
|
|
exit:
|
|
%P = phi i32* [ %Y1, %good ], [ %Y2, %bad ]
|
|
; CHECK: %[[phi:.*]] = phi i32 [ 0, %good ],
|
|
%Z2 = load i32* %P
|
|
ret i32 %Z2
|
|
; CHECK: ret i32 %[[phi]]
|
|
}
|
|
|
|
define i32 @test8(i32 %b, i32* %ptr) {
|
|
; Ensure that we rewrite allocas to the used type when that use is hidden by
|
|
; a PHI that can be speculated.
|
|
; CHECK: @test8
|
|
; CHECK-NOT: alloca
|
|
; CHECK-NOT: load
|
|
; CHECK: %[[value:.*]] = load i32* %ptr
|
|
; CHECK-NOT: load
|
|
; CHECK: %[[result:.*]] = phi i32 [ undef, %else ], [ %[[value]], %then ]
|
|
; CHECK-NEXT: ret i32 %[[result]]
|
|
|
|
entry:
|
|
%f = alloca float
|
|
%test = icmp ne i32 %b, 0
|
|
br i1 %test, label %then, label %else
|
|
|
|
then:
|
|
br label %exit
|
|
|
|
else:
|
|
%bitcast = bitcast float* %f to i32*
|
|
br label %exit
|
|
|
|
exit:
|
|
%phi = phi i32* [ %bitcast, %else ], [ %ptr, %then ]
|
|
%loaded = load i32* %phi, align 4
|
|
ret i32 %loaded
|
|
}
|
|
|
|
define i32 @test9(i32 %b, i32* %ptr) {
|
|
; Same as @test8 but for a select rather than a PHI node.
|
|
; CHECK: @test9
|
|
; CHECK-NOT: alloca
|
|
; CHECK-NOT: load
|
|
; CHECK: %[[value:.*]] = load i32* %ptr
|
|
; CHECK-NOT: load
|
|
; CHECK: %[[result:.*]] = select i1 %{{.*}}, i32 undef, i32 %[[value]]
|
|
; CHECK-NEXT: ret i32 %[[result]]
|
|
|
|
entry:
|
|
%f = alloca float
|
|
store i32 0, i32* %ptr
|
|
%test = icmp ne i32 %b, 0
|
|
%bitcast = bitcast float* %f to i32*
|
|
%select = select i1 %test, i32* %bitcast, i32* %ptr
|
|
%loaded = load i32* %select, align 4
|
|
ret i32 %loaded
|
|
}
|
|
|
|
define float @test10(i32 %b, float* %ptr) {
|
|
; Don't try to promote allocas which are not elligible for it even after
|
|
; rewriting due to the necessity of inserting bitcasts when speculating a PHI
|
|
; node.
|
|
; CHECK: @test10
|
|
; CHECK: %[[alloca:.*]] = alloca
|
|
; CHECK: %[[argvalue:.*]] = load float* %ptr
|
|
; CHECK: %[[cast:.*]] = bitcast double* %[[alloca]] to float*
|
|
; CHECK: %[[allocavalue:.*]] = load float* %[[cast]]
|
|
; CHECK: %[[result:.*]] = phi float [ %[[allocavalue]], %else ], [ %[[argvalue]], %then ]
|
|
; CHECK-NEXT: ret float %[[result]]
|
|
|
|
entry:
|
|
%f = alloca double
|
|
store double 0.0, double* %f
|
|
%test = icmp ne i32 %b, 0
|
|
br i1 %test, label %then, label %else
|
|
|
|
then:
|
|
br label %exit
|
|
|
|
else:
|
|
%bitcast = bitcast double* %f to float*
|
|
br label %exit
|
|
|
|
exit:
|
|
%phi = phi float* [ %bitcast, %else ], [ %ptr, %then ]
|
|
%loaded = load float* %phi, align 4
|
|
ret float %loaded
|
|
}
|
|
|
|
define float @test11(i32 %b, float* %ptr) {
|
|
; Same as @test10 but for a select rather than a PHI node.
|
|
; CHECK: @test11
|
|
; CHECK: %[[alloca:.*]] = alloca
|
|
; CHECK: %[[cast:.*]] = bitcast double* %[[alloca]] to float*
|
|
; CHECK: %[[allocavalue:.*]] = load float* %[[cast]]
|
|
; CHECK: %[[argvalue:.*]] = load float* %ptr
|
|
; CHECK: %[[result:.*]] = select i1 %{{.*}}, float %[[allocavalue]], float %[[argvalue]]
|
|
; CHECK-NEXT: ret float %[[result]]
|
|
|
|
entry:
|
|
%f = alloca double
|
|
store double 0.0, double* %f
|
|
store float 0.0, float* %ptr
|
|
%test = icmp ne i32 %b, 0
|
|
%bitcast = bitcast double* %f to float*
|
|
%select = select i1 %test, float* %bitcast, float* %ptr
|
|
%loaded = load float* %select, align 4
|
|
ret float %loaded
|
|
}
|
|
|
|
define i32 @test12(i32 %x, i32* %p) {
|
|
; Ensure we don't crash or fail to nuke dead selects of allocas if no load is
|
|
; never found.
|
|
; CHECK: @test12
|
|
; CHECK-NOT: alloca
|
|
; CHECK-NOT: select
|
|
; CHECK: ret i32 %x
|
|
|
|
entry:
|
|
%a = alloca i32
|
|
store i32 %x, i32* %a
|
|
%dead = select i1 undef, i32* %a, i32* %p
|
|
%load = load i32* %a
|
|
ret i32 %load
|
|
}
|
|
|
|
define i32 @test13(i32 %x, i32* %p) {
|
|
; Ensure we don't crash or fail to nuke dead phis of allocas if no load is ever
|
|
; found.
|
|
; CHECK: @test13
|
|
; CHECK-NOT: alloca
|
|
; CHECK-NOT: phi
|
|
; CHECK: ret i32 %x
|
|
|
|
entry:
|
|
%a = alloca i32
|
|
store i32 %x, i32* %a
|
|
br label %loop
|
|
|
|
loop:
|
|
%phi = phi i32* [ %p, %entry ], [ %a, %loop ]
|
|
br i1 undef, label %loop, label %exit
|
|
|
|
exit:
|
|
%load = load i32* %a
|
|
ret i32 %load
|
|
}
|
|
|
|
define i32 @PR13905() {
|
|
; Check a pattern where we have a chain of dead phi nodes to ensure they are
|
|
; deleted and promotion can proceed.
|
|
; CHECK: @PR13905
|
|
; CHECK-NOT: alloca i32
|
|
; CHECK: ret i32 undef
|
|
|
|
entry:
|
|
%h = alloca i32
|
|
store i32 0, i32* %h
|
|
br i1 undef, label %loop1, label %exit
|
|
|
|
loop1:
|
|
%phi1 = phi i32* [ null, %entry ], [ %h, %loop1 ], [ %h, %loop2 ]
|
|
br i1 undef, label %loop1, label %loop2
|
|
|
|
loop2:
|
|
br i1 undef, label %loop1, label %exit
|
|
|
|
exit:
|
|
%phi2 = phi i32* [ %phi1, %loop2 ], [ null, %entry ]
|
|
ret i32 undef
|
|
}
|
|
|
|
define i32 @PR13906() {
|
|
; Another pattern which can lead to crashes due to failing to clear out dead
|
|
; PHI nodes or select nodes. This triggers subtly differently from the above
|
|
; cases because the PHI node is (recursively) alive, but the select is dead.
|
|
; CHECK: @PR13906
|
|
; CHECK-NOT: alloca
|
|
|
|
entry:
|
|
%c = alloca i32
|
|
store i32 0, i32* %c
|
|
br label %for.cond
|
|
|
|
for.cond:
|
|
%d.0 = phi i32* [ undef, %entry ], [ %c, %if.then ], [ %d.0, %for.cond ]
|
|
br i1 undef, label %if.then, label %for.cond
|
|
|
|
if.then:
|
|
%tmpcast.d.0 = select i1 undef, i32* %c, i32* %d.0
|
|
br label %for.cond
|
|
}
|
|
|
|
define i64 @PR14132(i1 %flag) {
|
|
; CHECK: @PR14132
|
|
; Here we form a PHI-node by promoting the pointer alloca first, and then in
|
|
; order to promote the other two allocas, we speculate the load of the
|
|
; now-phi-node-pointer. In doing so we end up loading a 64-bit value from an i8
|
|
; alloca. While this is a bit dubious, we were asserting on trying to
|
|
; rewrite it. The trick is that the code using the value may carefully take
|
|
; steps to only use the not-undef bits, and so we need to at least loosely
|
|
; support this..
|
|
entry:
|
|
%a = alloca i64
|
|
%b = alloca i8
|
|
%ptr = alloca i64*
|
|
; CHECK-NOT: alloca
|
|
|
|
%ptr.cast = bitcast i64** %ptr to i8**
|
|
store i64 0, i64* %a
|
|
store i8 1, i8* %b
|
|
store i64* %a, i64** %ptr
|
|
br i1 %flag, label %if.then, label %if.end
|
|
|
|
if.then:
|
|
store i8* %b, i8** %ptr.cast
|
|
br label %if.end
|
|
; CHECK-NOT: store
|
|
; CHECK: %[[ext:.*]] = zext i8 1 to i64
|
|
|
|
if.end:
|
|
%tmp = load i64** %ptr
|
|
%result = load i64* %tmp
|
|
; CHECK-NOT: load
|
|
; CHECK: %[[result:.*]] = phi i64 [ %[[ext]], %if.then ], [ 0, %entry ]
|
|
|
|
ret i64 %result
|
|
; CHECK-NEXT: ret i64 %[[result]]
|
|
}
|