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llvm-mirror/test/Transforms/SROA/phi-and-select.ll
Nikita Popov 64dbdb829e [Mem2Reg] Regenerate test checks (NFC)
2021-06-21 11:06:28 +02:00

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LLVM
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; 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-LABEL: @test1(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[COND:%.*]] = icmp sle i32 0, 1
; CHECK-NEXT: br i1 [[COND]], label [[THEN:%.*]], label [[EXIT:%.*]]
; CHECK: then:
; CHECK-NEXT: br label [[EXIT]]
; CHECK: exit:
; CHECK-NEXT: [[PHI_SROA_SPECULATED:%.*]] = phi i32 [ 1, [[THEN]] ], [ 0, [[ENTRY:%.*]] ]
; CHECK-NEXT: ret i32 [[PHI_SROA_SPECULATED]]
;
entry:
%a = alloca [2 x i32]
%a0 = getelementptr [2 x i32], [2 x i32]* %a, i64 0, i32 0
%a1 = getelementptr [2 x i32], [2 x i32]* %a, i64 0, i32 1
store i32 0, i32* %a0
store i32 1, i32* %a1
%v0 = load i32, i32* %a0
%v1 = load i32, i32* %a1
%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 ]
%result = load i32, i32* %phi
ret i32 %result
}
define i32 @test2() {
; CHECK-LABEL: @test2(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[COND:%.*]] = icmp sle i32 0, 1
; CHECK-NEXT: [[RESULT_SROA_SPECULATED:%.*]] = select i1 [[COND]], i32 1, i32 0
; CHECK-NEXT: ret i32 [[RESULT_SROA_SPECULATED]]
;
entry:
%a = alloca [2 x i32]
%a0 = getelementptr [2 x i32], [2 x i32]* %a, i64 0, i32 0
%a1 = getelementptr [2 x i32], [2 x i32]* %a, i64 0, i32 1
store i32 0, i32* %a0
store i32 1, i32* %a1
%v0 = load i32, i32* %a0
%v1 = load i32, i32* %a1
%cond = icmp sle i32 %v0, %v1
%select = select i1 %cond, i32* %a1, i32* %a0
%result = load i32, i32* %select
ret i32 %result
}
; If bitcast isn't considered a safe phi/select use, the alloca
; remains as an array.
; FIXME: Why isn't this identical to test2?
define float @test2_bitcast() {
; CHECK-LABEL: @test2_bitcast(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[A_SROA_0:%.*]] = alloca i32, align 4
; CHECK-NEXT: [[A_SROA_3:%.*]] = alloca i32, align 4
; CHECK-NEXT: store i32 0, i32* [[A_SROA_0]], align 4
; CHECK-NEXT: store i32 1, i32* [[A_SROA_3]], align 4
; CHECK-NEXT: [[A_SROA_0_0_A_SROA_0_0_V0:%.*]] = load i32, i32* [[A_SROA_0]], align 4
; CHECK-NEXT: [[A_SROA_3_0_A_SROA_3_4_V1:%.*]] = load i32, i32* [[A_SROA_3]], align 4
; CHECK-NEXT: [[COND:%.*]] = icmp sle i32 [[A_SROA_0_0_A_SROA_0_0_V0]], [[A_SROA_3_0_A_SROA_3_4_V1]]
; CHECK-NEXT: [[SELECT:%.*]] = select i1 [[COND]], i32* [[A_SROA_3]], i32* [[A_SROA_0]]
; CHECK-NEXT: [[SELECT_BC:%.*]] = bitcast i32* [[SELECT]] to float*
; CHECK-NEXT: [[RESULT:%.*]] = load float, float* [[SELECT_BC]], align 4
; CHECK-NEXT: ret float [[RESULT]]
;
entry:
%a = alloca [2 x i32]
%a0 = getelementptr [2 x i32], [2 x i32]* %a, i64 0, i32 0
%a1 = getelementptr [2 x i32], [2 x i32]* %a, i64 0, i32 1
store i32 0, i32* %a0
store i32 1, i32* %a1
%v0 = load i32, i32* %a0
%v1 = load i32, i32* %a1
%cond = icmp sle i32 %v0, %v1
%select = select i1 %cond, i32* %a1, i32* %a0
%select.bc = bitcast i32* %select to float*
%result = load float, float* %select.bc
ret float %result
}
define i32 @test2_addrspacecast() {
; CHECK-LABEL: @test2_addrspacecast(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[A_SROA_0:%.*]] = alloca i32, align 4
; CHECK-NEXT: [[A_SROA_3:%.*]] = alloca i32, align 4
; CHECK-NEXT: store i32 0, i32* [[A_SROA_0]], align 4
; CHECK-NEXT: store i32 1, i32* [[A_SROA_3]], align 4
; CHECK-NEXT: [[A_SROA_0_0_A_SROA_0_0_V0:%.*]] = load i32, i32* [[A_SROA_0]], align 4
; CHECK-NEXT: [[A_SROA_3_0_A_SROA_3_4_V1:%.*]] = load i32, i32* [[A_SROA_3]], align 4
; CHECK-NEXT: [[COND:%.*]] = icmp sle i32 [[A_SROA_0_0_A_SROA_0_0_V0]], [[A_SROA_3_0_A_SROA_3_4_V1]]
; CHECK-NEXT: [[SELECT:%.*]] = select i1 [[COND]], i32* [[A_SROA_3]], i32* [[A_SROA_0]]
; CHECK-NEXT: [[SELECT_ASC:%.*]] = addrspacecast i32* [[SELECT]] to i32 addrspace(1)*
; CHECK-NEXT: [[RESULT:%.*]] = load i32, i32 addrspace(1)* [[SELECT_ASC]], align 4
; CHECK-NEXT: ret i32 [[RESULT]]
;
entry:
%a = alloca [2 x i32]
%a0 = getelementptr [2 x i32], [2 x i32]* %a, i64 0, i32 0
%a1 = getelementptr [2 x i32], [2 x i32]* %a, i64 0, i32 1
store i32 0, i32* %a0
store i32 1, i32* %a1
%v0 = load i32, i32* %a0
%v1 = load i32, i32* %a1
%cond = icmp sle i32 %v0, %v1
%select = select i1 %cond, i32* %a1, i32* %a0
%select.asc = addrspacecast i32* %select to i32 addrspace(1)*
%result = load i32, i32 addrspace(1)* %select.asc
ret i32 %result
}
define i32 @test3(i32 %x) {
; CHECK-LABEL: @test3(
; CHECK-NEXT: entry:
; CHECK-NEXT: switch i32 [[X:%.*]], label [[BB0:%.*]] [
; CHECK-NEXT: i32 1, label [[BB1:%.*]]
; CHECK-NEXT: i32 2, label [[BB2:%.*]]
; CHECK-NEXT: i32 3, label [[BB3:%.*]]
; CHECK-NEXT: i32 4, label [[BB4:%.*]]
; CHECK-NEXT: i32 5, label [[BB5:%.*]]
; CHECK-NEXT: i32 6, label [[BB6:%.*]]
; CHECK-NEXT: i32 7, label [[BB7:%.*]]
; CHECK-NEXT: ]
; CHECK: bb0:
; CHECK-NEXT: br label [[EXIT:%.*]]
; CHECK: bb1:
; CHECK-NEXT: br label [[EXIT]]
; CHECK: bb2:
; CHECK-NEXT: br label [[EXIT]]
; CHECK: bb3:
; CHECK-NEXT: br label [[EXIT]]
; CHECK: bb4:
; CHECK-NEXT: br label [[EXIT]]
; CHECK: bb5:
; CHECK-NEXT: br label [[EXIT]]
; CHECK: bb6:
; CHECK-NEXT: br label [[EXIT]]
; CHECK: bb7:
; CHECK-NEXT: br label [[EXIT]]
; CHECK: exit:
; CHECK-NEXT: [[PHI_SROA_SPECULATED:%.*]] = phi i32 [ 1, [[BB0]] ], [ 0, [[BB1]] ], [ 0, [[BB2]] ], [ 1, [[BB3]] ], [ 1, [[BB4]] ], [ 0, [[BB5]] ], [ 0, [[BB6]] ], [ 1, [[BB7]] ]
; CHECK-NEXT: ret i32 [[PHI_SROA_SPECULATED]]
;
entry:
%a = alloca [2 x i32]
; 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], [2 x i32]* %a, i64 0, i32 0
%a0b = getelementptr [2 x i32], [2 x i32]* %a, i64 0, i32 0
%a1 = getelementptr [2 x i32], [2 x i32]* %a, i64 0, i32 1
%a1b = getelementptr [2 x i32], [2 x i32]* %a, i64 0, i32 1
store i32 0, i32* %a0
store i32 1, i32* %a1
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 ]
%result = load i32, i32* %phi
ret i32 %result
}
define i32 @test4() {
; CHECK-LABEL: @test4(
; CHECK-NEXT: entry:
; CHECK-NEXT: ret i32 0
;
entry:
%a = alloca [2 x i32]
%a0 = getelementptr [2 x i32], [2 x i32]* %a, i64 0, i32 0
%a1 = getelementptr [2 x i32], [2 x i32]* %a, i64 0, i32 1
store i32 0, i32* %a0
store i32 1, i32* %a1
%v0 = load i32, i32* %a0
%v1 = load i32, i32* %a1
%cond = icmp sle i32 %v0, %v1
%select = select i1 %cond, i32* %a0, i32* %a0
%result = load i32, i32* %select
ret i32 %result
}
define i32 @test5(i32* %b) {
; CHECK-LABEL: @test5(
; CHECK-NEXT: entry:
; CHECK-NEXT: ret i32 1
;
entry:
%a = alloca [2 x i32]
%a1 = getelementptr [2 x i32], [2 x i32]* %a, i64 0, i32 1
store i32 1, i32* %a1
%select = select i1 true, i32* %a1, i32* %b
%result = load i32, i32* %select
ret i32 %result
}
declare void @f(i32*, i32*)
define i32 @test6(i32* %b) {
; CHECK-LABEL: @test6(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[SELECT2:%.*]] = select i1 false, i32* undef, i32* [[B:%.*]]
; CHECK-NEXT: [[SELECT3:%.*]] = select i1 false, i32* undef, i32* [[B]]
; CHECK-NEXT: call void @f(i32* [[SELECT2]], i32* [[SELECT3]])
; CHECK-NEXT: ret i32 1
;
entry:
%a = alloca [2 x i32]
%c = alloca i32
%a1 = getelementptr [2 x i32], [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
; Note, this would potentially escape the alloca pointer except for the
; constant folding of the select.
call void @f(i32* %select2, i32* %select3)
%result = load i32, i32* %select
%dead = load i32, i32* %c
ret i32 %result
}
define i32 @test7() {
; CHECK-LABEL: @test7(
; CHECK-NEXT: entry:
; CHECK-NEXT: br i1 undef, label [[GOOD:%.*]], label [[BAD:%.*]]
; CHECK: good:
; CHECK-NEXT: br label [[EXIT:%.*]]
; CHECK: bad:
; CHECK-NEXT: [[P_SROA_SPECULATE_LOAD_BAD:%.*]] = load i32, i32* undef, align 4
; CHECK-NEXT: br label [[EXIT]]
; CHECK: exit:
; CHECK-NEXT: [[P_SROA_SPECULATED:%.*]] = phi i32 [ 0, [[GOOD]] ], [ [[P_SROA_SPECULATE_LOAD_BAD]], [[BAD]] ]
; CHECK-NEXT: ret i32 [[P_SROA_SPECULATED]]
;
entry:
%X = alloca i32
br i1 undef, label %good, label %bad
good:
%Y1 = getelementptr i32, i32* %X, i64 0
store i32 0, i32* %Y1
br label %exit
bad:
%Y2 = getelementptr i32, i32* %X, i64 1
store i32 0, i32* %Y2
br label %exit
exit:
%P = phi i32* [ %Y1, %good ], [ %Y2, %bad ]
%Z2 = load i32, i32* %P
ret i32 %Z2
}
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-LABEL: @test8(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[TEST:%.*]] = icmp ne i32 [[B:%.*]], 0
; CHECK-NEXT: br i1 [[TEST]], label [[THEN:%.*]], label [[ELSE:%.*]]
; CHECK: then:
; CHECK-NEXT: [[PHI_SROA_SPECULATE_LOAD_THEN:%.*]] = load i32, i32* [[PTR:%.*]], align 4
; CHECK-NEXT: br label [[EXIT:%.*]]
; CHECK: else:
; CHECK-NEXT: br label [[EXIT]]
; CHECK: exit:
; CHECK-NEXT: [[PHI_SROA_SPECULATED:%.*]] = phi i32 [ undef, [[ELSE]] ], [ [[PHI_SROA_SPECULATE_LOAD_THEN]], [[THEN]] ]
; CHECK-NEXT: ret i32 [[PHI_SROA_SPECULATED]]
;
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, 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-LABEL: @test9(
; CHECK-NEXT: entry:
; CHECK-NEXT: store i32 0, i32* [[PTR:%.*]], align 4
; CHECK-NEXT: [[TEST:%.*]] = icmp ne i32 [[B:%.*]], 0
; CHECK-NEXT: [[LOADED_SROA_SPECULATE_LOAD_FALSE:%.*]] = load i32, i32* [[PTR]], align 4
; CHECK-NEXT: [[LOADED_SROA_SPECULATED:%.*]] = select i1 [[TEST]], i32 undef, i32 [[LOADED_SROA_SPECULATE_LOAD_FALSE]]
; CHECK-NEXT: ret i32 [[LOADED_SROA_SPECULATED]]
;
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, 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-LABEL: @test10(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[F:%.*]] = alloca double, align 8
; CHECK-NEXT: store double 0.000000e+00, double* [[F]], align 8
; CHECK-NEXT: [[TEST:%.*]] = icmp ne i32 [[B:%.*]], 0
; CHECK-NEXT: br i1 [[TEST]], label [[THEN:%.*]], label [[ELSE:%.*]]
; CHECK: then:
; CHECK-NEXT: [[PHI_SROA_SPECULATE_LOAD_THEN:%.*]] = load float, float* [[PTR:%.*]], align 4
; CHECK-NEXT: br label [[EXIT:%.*]]
; CHECK: else:
; CHECK-NEXT: [[F_0_F_0_BITCAST_SROA_CAST:%.*]] = bitcast double* [[F]] to float*
; CHECK-NEXT: [[F_0_PHI_SROA_SPECULATE_LOAD_ELSE:%.*]] = load float, float* [[F_0_F_0_BITCAST_SROA_CAST]], align 8
; CHECK-NEXT: br label [[EXIT]]
; CHECK: exit:
; CHECK-NEXT: [[PHI_SROA_SPECULATED:%.*]] = phi float [ [[F_0_PHI_SROA_SPECULATE_LOAD_ELSE]], [[ELSE]] ], [ [[PHI_SROA_SPECULATE_LOAD_THEN]], [[THEN]] ]
; CHECK-NEXT: ret float [[PHI_SROA_SPECULATED]]
;
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, 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-LABEL: @test11(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[F:%.*]] = alloca double, align 8
; CHECK-NEXT: store double 0.000000e+00, double* [[F]], align 8
; CHECK-NEXT: store float 0.000000e+00, float* [[PTR:%.*]], align 4
; CHECK-NEXT: [[TEST:%.*]] = icmp ne i32 [[B:%.*]], 0
; CHECK-NEXT: [[F_0_F_0_BITCAST_SROA_CAST:%.*]] = bitcast double* [[F]] to float*
; CHECK-NEXT: [[F_0_LOADED_SROA_SPECULATE_LOAD_TRUE:%.*]] = load float, float* [[F_0_F_0_BITCAST_SROA_CAST]], align 8
; CHECK-NEXT: [[LOADED_SROA_SPECULATE_LOAD_FALSE:%.*]] = load float, float* [[PTR]], align 4
; CHECK-NEXT: [[LOADED_SROA_SPECULATED:%.*]] = select i1 [[TEST]], float [[F_0_LOADED_SROA_SPECULATE_LOAD_TRUE]], float [[LOADED_SROA_SPECULATE_LOAD_FALSE]]
; CHECK-NEXT: ret float [[LOADED_SROA_SPECULATED]]
;
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, 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-LABEL: @test12(
; CHECK-NEXT: entry:
; CHECK-NEXT: ret i32 [[X:%.*]]
;
entry:
%a = alloca i32
store i32 %x, i32* %a
%dead = select i1 undef, i32* %a, i32* %p
%load = load i32, 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-LABEL: @test13(
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: br i1 undef, label [[LOOP]], label [[EXIT:%.*]]
; CHECK: exit:
; CHECK-NEXT: 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, i32* %a
ret i32 %load
}
define i32 @test14(i1 %b1, i1 %b2, i32* %ptr) {
; Check for problems when there are both selects and phis and one is
; speculatable toward promotion but the other is not. That should block all of
; the speculation.
; CHECK-LABEL: @test14(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[F:%.*]] = alloca i32, align 4
; CHECK-NEXT: [[G:%.*]] = alloca i32, align 4
; CHECK-NEXT: store i32 0, i32* [[F]], align 4
; CHECK-NEXT: store i32 0, i32* [[G]], align 4
; CHECK-NEXT: [[F_SELECT:%.*]] = select i1 [[B1:%.*]], i32* [[F]], i32* [[PTR:%.*]]
; CHECK-NEXT: br i1 [[B2:%.*]], label [[THEN:%.*]], label [[ELSE:%.*]]
; CHECK: then:
; CHECK-NEXT: br label [[EXIT:%.*]]
; CHECK: else:
; CHECK-NEXT: br label [[EXIT]]
; CHECK: exit:
; CHECK-NEXT: [[F_PHI:%.*]] = phi i32* [ [[F]], [[THEN]] ], [ [[F_SELECT]], [[ELSE]] ]
; CHECK-NEXT: [[G_PHI:%.*]] = phi i32* [ [[G]], [[THEN]] ], [ [[PTR]], [[ELSE]] ]
; CHECK-NEXT: [[F_LOADED:%.*]] = load i32, i32* [[F_PHI]], align 4
; CHECK-NEXT: [[G_SELECT:%.*]] = select i1 [[B1]], i32* [[G]], i32* [[G_PHI]]
; CHECK-NEXT: [[G_LOADED:%.*]] = load i32, i32* [[G_SELECT]], align 4
; CHECK-NEXT: [[RESULT:%.*]] = add i32 [[F_LOADED]], [[G_LOADED]]
; CHECK-NEXT: ret i32 [[RESULT]]
;
entry:
%f = alloca i32
%g = alloca i32
store i32 0, i32* %f
store i32 0, i32* %g
%f.select = select i1 %b1, i32* %f, i32* %ptr
br i1 %b2, label %then, label %else
then:
br label %exit
else:
br label %exit
exit:
%f.phi = phi i32* [ %f, %then ], [ %f.select, %else ]
%g.phi = phi i32* [ %g, %then ], [ %ptr, %else ]
%f.loaded = load i32, i32* %f.phi
%g.select = select i1 %b1, i32* %g, i32* %g.phi
%g.loaded = load i32, i32* %g.select
%result = add i32 %f.loaded, %g.loaded
ret i32 %result
}
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-LABEL: @PR13905(
; CHECK-NEXT: entry:
; CHECK-NEXT: br i1 undef, label [[LOOP1:%.*]], label [[EXIT:%.*]]
; CHECK: loop1:
; CHECK-NEXT: br i1 undef, label [[LOOP1]], label [[LOOP2:%.*]]
; CHECK: loop2:
; CHECK-NEXT: br i1 undef, label [[LOOP1]], label [[EXIT]]
; CHECK: exit:
; CHECK-NEXT: [[PHI2:%.*]] = phi i32* [ undef, [[LOOP2]] ], [ null, [[ENTRY:%.*]] ]
; CHECK-NEXT: 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-LABEL: @PR13906(
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[FOR_COND:%.*]]
; CHECK: for.cond:
; CHECK-NEXT: br i1 undef, label [[IF_THEN:%.*]], label [[FOR_COND]]
; CHECK: if.then:
; CHECK-NEXT: br label [[FOR_COND]]
;
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-LABEL: @PR14132(
; CHECK-NEXT: entry:
; CHECK-NEXT: br i1 [[FLAG:%.*]], label [[IF_THEN:%.*]], label [[IF_END:%.*]]
; CHECK: if.then:
; CHECK-NEXT: [[B_0_LOAD_EXT:%.*]] = zext i8 1 to i64
; CHECK-NEXT: br label [[IF_END]]
; CHECK: if.end:
; CHECK-NEXT: [[PTR_0_SROA_SPECULATED:%.*]] = phi i64 [ [[B_0_LOAD_EXT]], [[IF_THEN]] ], [ 0, [[ENTRY:%.*]] ]
; CHECK-NEXT: ret i64 [[PTR_0_SROA_SPECULATED]]
;
; 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, align 8
%b = alloca i8, align 8
%ptr = alloca i64*, align 8
%ptr.cast = bitcast i64** %ptr to i8**
store i64 0, i64* %a, align 8
store i8 1, i8* %b, align 8
store i64* %a, i64** %ptr, align 8
br i1 %flag, label %if.then, label %if.end
if.then:
store i8* %b, i8** %ptr.cast, align 8
br label %if.end
if.end:
%tmp = load i64*, i64** %ptr, align 8
%result = load i64, i64* %tmp, align 8
ret i64 %result
}
define float @PR16687(i64 %x, i1 %flag) {
; CHECK-LABEL: @PR16687(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[A_SROA_0_0_EXTRACT_TRUNC:%.*]] = trunc i64 [[X:%.*]] to i32
; CHECK-NEXT: [[A_SROA_2_0_EXTRACT_SHIFT:%.*]] = lshr i64 [[X]], 32
; CHECK-NEXT: [[A_SROA_2_0_EXTRACT_TRUNC:%.*]] = trunc i64 [[A_SROA_2_0_EXTRACT_SHIFT]] to i32
; CHECK-NEXT: br i1 [[FLAG:%.*]], label [[THEN:%.*]], label [[ELSE:%.*]]
; CHECK: then:
; CHECK-NEXT: [[TMP0:%.*]] = bitcast i32 [[A_SROA_0_0_EXTRACT_TRUNC]] to float
; CHECK-NEXT: br label [[END:%.*]]
; CHECK: else:
; CHECK-NEXT: [[TMP1:%.*]] = bitcast i32 [[A_SROA_2_0_EXTRACT_TRUNC]] to float
; CHECK-NEXT: br label [[END]]
; CHECK: end:
; CHECK-NEXT: [[A_PHI_F_SROA_SPECULATED:%.*]] = phi float [ [[TMP0]], [[THEN]] ], [ [[TMP1]], [[ELSE]] ]
; CHECK-NEXT: ret float [[A_PHI_F_SROA_SPECULATED]]
;
; Check that even when we try to speculate the same phi twice (in two slices)
; on an otherwise promotable construct, we don't get ahead of ourselves and try
; to promote one of the slices prior to speculating it.
entry:
%a = alloca i64, align 8
store i64 %x, i64* %a
br i1 %flag, label %then, label %else
then:
%a.f = bitcast i64* %a to float*
br label %end
else:
%a.raw = bitcast i64* %a to i8*
%a.raw.4 = getelementptr i8, i8* %a.raw, i64 4
%a.raw.4.f = bitcast i8* %a.raw.4 to float*
br label %end
end:
%a.phi.f = phi float* [ %a.f, %then ], [ %a.raw.4.f, %else ]
%f = load float, float* %a.phi.f
ret float %f
}
; Verifies we fixed PR20425. We should be able to promote all alloca's to
; registers in this test.
;
; %0 = slice
; %1 = slice
; %2 = phi(%0, %1) // == slice
define float @simplify_phi_nodes_that_equal_slice(i1 %cond, float* %temp) {
; CHECK-LABEL: @simplify_phi_nodes_that_equal_slice(
; CHECK-NEXT: entry:
; CHECK-NEXT: br i1 [[COND:%.*]], label [[THEN:%.*]], label [[ELSE:%.*]]
; CHECK: then:
; CHECK-NEXT: br label [[MERGE:%.*]]
; CHECK: else:
; CHECK-NEXT: br label [[MERGE]]
; CHECK: merge:
; CHECK-NEXT: [[ARR_SROA_0_0:%.*]] = phi float [ 1.000000e+00, [[THEN]] ], [ 2.000000e+00, [[ELSE]] ]
; CHECK-NEXT: store float 0.000000e+00, float* [[TEMP:%.*]], align 4
; CHECK-NEXT: ret float [[ARR_SROA_0_0]]
;
entry:
%arr = alloca [4 x float], align 4
br i1 %cond, label %then, label %else
then:
%0 = getelementptr inbounds [4 x float], [4 x float]* %arr, i64 0, i64 3
store float 1.000000e+00, float* %0, align 4
br label %merge
else:
%1 = getelementptr inbounds [4 x float], [4 x float]* %arr, i64 0, i64 3
store float 2.000000e+00, float* %1, align 4
br label %merge
merge:
%2 = phi float* [ %0, %then ], [ %1, %else ]
store float 0.000000e+00, float* %temp, align 4
%3 = load float, float* %2, align 4
ret float %3
}
; A slightly complicated example for PR20425.
;
; %0 = slice
; %1 = phi(%0) // == slice
; %2 = slice
; %3 = phi(%1, %2) // == slice
define float @simplify_phi_nodes_that_equal_slice_2(i1 %cond, float* %temp) {
; CHECK-LABEL: @simplify_phi_nodes_that_equal_slice_2(
; CHECK-NEXT: entry:
; CHECK-NEXT: br i1 [[COND:%.*]], label [[THEN:%.*]], label [[ELSE:%.*]]
; CHECK: then:
; CHECK-NEXT: br label [[THEN2:%.*]]
; CHECK: then2:
; CHECK-NEXT: br label [[MERGE:%.*]]
; CHECK: else:
; CHECK-NEXT: br label [[MERGE]]
; CHECK: merge:
; CHECK-NEXT: [[ARR_SROA_0_0:%.*]] = phi float [ 2.000000e+00, [[THEN2]] ], [ 3.000000e+00, [[ELSE]] ]
; CHECK-NEXT: store float 0.000000e+00, float* [[TEMP:%.*]], align 4
; CHECK-NEXT: ret float [[ARR_SROA_0_0]]
;
entry:
%arr = alloca [4 x float], align 4
br i1 %cond, label %then, label %else
then:
%0 = getelementptr inbounds [4 x float], [4 x float]* %arr, i64 0, i64 3
store float 1.000000e+00, float* %0, align 4
br label %then2
then2:
%1 = phi float* [ %0, %then ]
store float 2.000000e+00, float* %1, align 4
br label %merge
else:
%2 = getelementptr inbounds [4 x float], [4 x float]* %arr, i64 0, i64 3
store float 3.000000e+00, float* %2, align 4
br label %merge
merge:
%3 = phi float* [ %1, %then2 ], [ %2, %else ]
store float 0.000000e+00, float* %temp, align 4
%4 = load float, float* %3, align 4
ret float %4
}
%struct.S = type { i32 }
; Verifies we fixed PR20822. We have a foldable PHI feeding a speculatable PHI
; which requires the rewriting of the speculated PHI to handle insertion
; when the incoming pointer is itself from a PHI node. We would previously
; insert a bitcast instruction *before* a PHI, producing an invalid module;
; make sure we insert *after* the first non-PHI instruction.
define void @PR20822() {
; CHECK-LABEL: @PR20822(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[F_SROA_0:%.*]] = alloca i32, align 4
; CHECK-NEXT: br i1 undef, label [[IF_END:%.*]], label [[FOR_COND:%.*]]
; CHECK: for.cond:
; CHECK-NEXT: br label [[IF_END]]
; CHECK: if.end:
; CHECK-NEXT: [[TMP0:%.*]] = phi i32 [ undef, [[ENTRY:%.*]] ], [ undef, [[FOR_COND]] ]
; CHECK-NEXT: [[F_SROA_0_0_F2_SROA_CAST1:%.*]] = bitcast i32* [[F_SROA_0]] to %struct.S*
; CHECK-NEXT: br i1 undef, label [[IF_THEN5:%.*]], label [[IF_THEN2:%.*]]
; CHECK: if.then2:
; CHECK-NEXT: br label [[IF_THEN5]]
; CHECK: if.then5:
; CHECK-NEXT: [[F1:%.*]] = phi %struct.S* [ undef, [[IF_THEN2]] ], [ [[F_SROA_0_0_F2_SROA_CAST1]], [[IF_END]] ]
; CHECK-NEXT: [[DOTFCA_0_GEP:%.*]] = getelementptr inbounds [[STRUCT_S:%.*]], %struct.S* [[F1]], i32 0, i32 0
; CHECK-NEXT: store i32 undef, i32* [[DOTFCA_0_GEP]], align 4
; CHECK-NEXT: ret void
;
entry:
%f = alloca %struct.S, align 4
br i1 undef, label %if.end, label %for.cond
for.cond: ; preds = %for.cond, %entry
br label %if.end
if.end: ; preds = %for.cond, %entry
%f2 = phi %struct.S* [ %f, %entry ], [ %f, %for.cond ]
phi i32 [ undef, %entry ], [ undef, %for.cond ]
br i1 undef, label %if.then5, label %if.then2
if.then2: ; preds = %if.end
br label %if.then5
if.then5: ; preds = %if.then2, %if.end
%f1 = phi %struct.S* [ undef, %if.then2 ], [ %f2, %if.end ]
store %struct.S undef, %struct.S* %f1, align 4
ret void
}
define i32 @phi_align(i32* %z) {
; CHECK-LABEL: @phi_align(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[A_SROA_0:%.*]] = alloca [7 x i8], align 1
; CHECK-NEXT: [[A_SROA_0_3_A1_SROA_IDX:%.*]] = getelementptr inbounds [7 x i8], [7 x i8]* [[A_SROA_0]], i64 0, i64 3
; CHECK-NEXT: [[A_SROA_0_3_A1_SROA_CAST:%.*]] = bitcast i8* [[A_SROA_0_3_A1_SROA_IDX]] to i32*
; CHECK-NEXT: [[A_SROA_0_0_A0_SROA_CAST:%.*]] = bitcast [7 x i8]* [[A_SROA_0]] to i32*
; CHECK-NEXT: store i32 0, i32* [[A_SROA_0_0_A0_SROA_CAST]], align 1
; CHECK-NEXT: [[A_SROA_0_3_A1_SROA_IDX7:%.*]] = getelementptr inbounds [7 x i8], [7 x i8]* [[A_SROA_0]], i64 0, i64 3
; CHECK-NEXT: [[A_SROA_0_3_A1_SROA_CAST8:%.*]] = bitcast i8* [[A_SROA_0_3_A1_SROA_IDX7]] to i32*
; CHECK-NEXT: store i32 1, i32* [[A_SROA_0_3_A1_SROA_CAST8]], align 1
; CHECK-NEXT: [[A_SROA_0_0_A0_SROA_CAST6:%.*]] = bitcast [7 x i8]* [[A_SROA_0]] to i32*
; CHECK-NEXT: [[A_SROA_0_0_A_SROA_0_1_V0:%.*]] = load i32, i32* [[A_SROA_0_0_A0_SROA_CAST6]], align 1
; CHECK-NEXT: [[A_SROA_0_3_A1_SROA_IDX9:%.*]] = getelementptr inbounds [7 x i8], [7 x i8]* [[A_SROA_0]], i64 0, i64 3
; CHECK-NEXT: [[A_SROA_0_3_A1_SROA_CAST10:%.*]] = bitcast i8* [[A_SROA_0_3_A1_SROA_IDX9]] to i32*
; CHECK-NEXT: [[A_SROA_0_3_A_SROA_0_4_V1:%.*]] = load i32, i32* [[A_SROA_0_3_A1_SROA_CAST10]], align 1
; CHECK-NEXT: [[COND:%.*]] = icmp sle i32 [[A_SROA_0_0_A_SROA_0_1_V0]], [[A_SROA_0_3_A_SROA_0_4_V1]]
; CHECK-NEXT: br i1 [[COND]], label [[THEN:%.*]], label [[EXIT:%.*]]
; CHECK: then:
; CHECK-NEXT: br label [[EXIT]]
; CHECK: exit:
; CHECK-NEXT: [[PHI:%.*]] = phi i32* [ [[A_SROA_0_3_A1_SROA_CAST]], [[THEN]] ], [ [[Z:%.*]], [[ENTRY:%.*]] ]
; CHECK-NEXT: [[RESULT:%.*]] = load i32, i32* [[PHI]], align 1
; CHECK-NEXT: ret i32 [[RESULT]]
;
entry:
%a = alloca [8 x i8], align 8
%a0x = getelementptr [8 x i8], [8 x i8]* %a, i64 0, i32 1
%a0 = bitcast i8* %a0x to i32*
%a1x = getelementptr [8 x i8], [8 x i8]* %a, i64 0, i32 4
%a1 = bitcast i8* %a1x to i32*
store i32 0, i32* %a0, align 1
store i32 1, i32* %a1, align 4
%v0 = load i32, i32* %a0, align 1
%v1 = load i32, i32* %a1, align 4
%cond = icmp sle i32 %v0, %v1
br i1 %cond, label %then, label %exit
then:
br label %exit
exit:
%phi = phi i32* [ %a1, %then ], [ %z, %entry ]
%result = load i32, i32* %phi, align 4
ret i32 %result
}
; Don't speculate a load based on an earlier volatile operation.
define i8 @volatile_select(i8* %p, i1 %b) {
; CHECK-LABEL: @volatile_select(
; CHECK-NEXT: [[P2:%.*]] = alloca i8, align 1
; CHECK-NEXT: store i8 0, i8* [[P2]], align 1
; CHECK-NEXT: store volatile i8 0, i8* [[P:%.*]], align 1
; CHECK-NEXT: [[PX:%.*]] = select i1 [[B:%.*]], i8* [[P]], i8* [[P2]]
; CHECK-NEXT: [[V2:%.*]] = load i8, i8* [[PX]], align 1
; CHECK-NEXT: ret i8 [[V2]]
;
%p2 = alloca i8
store i8 0, i8* %p2
store volatile i8 0, i8* %p
%px = select i1 %b, i8* %p, i8* %p2
%v2 = load i8, i8* %px
ret i8 %v2
}
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