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clang-p2996/llvm/test/Transforms/IRCE/variable-loop-bounds.ll
Jingu Kang 3ea4bc7842 [IRCE] Add tests for conservative bound check 
Prevent cases in which the start value of IV is bigger than bound for
increasing.

Prevent cases in which the start value of IV is smaller than bound for
decreasing.

Differential Revision: https://reviews.llvm.org/D101174
2021-04-28 11:14:21 +01:00

403 lines
16 KiB
LLVM
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; RUN: opt -irce -S -verify-loop-info -irce-print-changed-loops -irce-skip-profitability-checks < %s 2>&1 | FileCheck %s
; CHECK: irce: in function test_inc_eq: constrained Loop at depth 1 containing: %for.body<header>,%if.else,%if.then,%for.inc<latch><exiting>
; CHECK: irce: in function test_inc_ne: constrained Loop at depth 1 containing: %for.body<header>,%if.else,%if.then,%for.inc<latch><exiting>
; CHECK: irce: in function test_inc_slt: constrained Loop at depth 1 containing: %for.body<header>,%if.else,%if.then,%for.inc<latch><exiting>
; CHECK: irce: in function test_inc_ult: constrained Loop at depth 1 containing: %for.body<header>,%if.else,%if.then,%for.inc<latch><exiting>
; CHECK: irce: in function signed_var_imm_dec_sgt: constrained Loop at depth 1 containing: %for.body<header>,%if.else,%for.inc<latch><exiting>
; CHECK-NOT: irce: in function signed_var_imm_dec_slt: constrained Loop at depth 1 containing: %for.body<header>,%if.else,%for.inc<latch><exiting>
; CHECK: irce: in function signed_var_imm_dec_sge: constrained Loop at depth 1 containing: %for.body<header>,%if.else,%for.inc<latch><exiting>
; CHECK: irce: in function signed_var_imm_dec_ne: constrained Loop at depth 1 containing: %for.body<header>,%if.else,%for.inc<latch><exiting>
; CHECK-NOT: irce: in function signed_var_imm_dec_eq: constrained Loop at depth 1 containing: %for.body<header>,%if.else,%for.inc<latch><exiting>
; CHECK-NOT: irce: in function test_dec_bound_with_smaller_start_than_bound: constrained Loop at depth 1 containing: %for.body<header>,%if.else,%for.dec<latch><exiting>
; CHECK-NOT: irce: in function test_inc_bound_with_bigger_start_than_bound: constrained Loop at depth 1 containing: %for.body<header>,%if.else,%for.dec<latch><exiting>
; CHECK-LABEL: test_inc_eq(
; CHECK: main.exit.selector:
; CHECK: [[PSEUDO_PHI:%[^ ]+]] = phi i32 [ %inc, %for.inc ]
; CHECK: [[COND:%[^ ]+]] = icmp ult i32 [[PSEUDO_PHI]], %N
; CHECK: br i1 [[COND]], label %main.pseudo.exit, label %for.cond.cleanup.loopexit
define void @test_inc_eq(i32* nocapture %a, i32* nocapture readonly %b, i32* nocapture readonly %c, i32 %N) {
entry:
%cmp16 = icmp sgt i32 %N, 0
br i1 %cmp16, label %for.body, label %for.cond.cleanup
for.cond.cleanup:
ret void
for.body:
%i.017 = phi i32 [ %inc, %for.inc ], [ 0, %entry ]
%cmp1 = icmp ult i32 %i.017, 512
%arrayidx = getelementptr inbounds i32, i32* %b, i32 %i.017
%0 = load i32, i32* %arrayidx, align 4
%arrayidx2 = getelementptr inbounds i32, i32* %c, i32 %i.017
%1 = load i32, i32* %arrayidx2, align 4
br i1 %cmp1, label %if.then, label %if.else
if.then:
%sub = sub i32 %0, %1
%arrayidx3 = getelementptr inbounds i32, i32* %a, i32 %i.017
%2 = load i32, i32* %arrayidx3, align 4
%add = add nsw i32 %sub, %2
store i32 %add, i32* %arrayidx3, align 4
br label %for.inc
if.else:
%add6 = add nsw i32 %1, %0
%arrayidx7 = getelementptr inbounds i32, i32* %a, i32 %i.017
store i32 %add6, i32* %arrayidx7, align 4
br label %for.inc
for.inc:
%inc = add nuw nsw i32 %i.017, 1
%exitcond = icmp eq i32 %inc, %N
br i1 %exitcond, label %for.cond.cleanup, label %for.body
}
; CHECK-LABEL: test_inc_ne
; CHECK: main.exit.selector:
; CHECK: [[PSEUDO_PHI:%[^ ]+]] = phi i32 [ %inc, %for.inc ]
; CHECK: [[COND:%[^ ]+]] = icmp ult i32 [[PSEUDO_PHI]], %N
; CHECK: br i1 [[COND]], label %main.pseudo.exit, label %for.cond.cleanup.loopexit
define void @test_inc_ne(i32* nocapture %a, i32* nocapture readonly %b, i32* nocapture readonly %c, i32 %N) {
entry:
%cmp16 = icmp sgt i32 %N, 0
br i1 %cmp16, label %for.body, label %for.cond.cleanup
for.cond.cleanup:
ret void
for.body:
%i.017 = phi i32 [ %inc, %for.inc ], [ 0, %entry ]
%cmp1 = icmp ult i32 %i.017, 512
%arrayidx = getelementptr inbounds i32, i32* %b, i32 %i.017
%0 = load i32, i32* %arrayidx, align 4
%arrayidx2 = getelementptr inbounds i32, i32* %c, i32 %i.017
%1 = load i32, i32* %arrayidx2, align 4
br i1 %cmp1, label %if.then, label %if.else
if.then:
%sub = sub i32 %0, %1
%arrayidx3 = getelementptr inbounds i32, i32* %a, i32 %i.017
%2 = load i32, i32* %arrayidx3, align 4
%add = add nsw i32 %sub, %2
store i32 %add, i32* %arrayidx3, align 4
br label %for.inc
if.else:
%add6 = add nsw i32 %1, %0
%arrayidx7 = getelementptr inbounds i32, i32* %a, i32 %i.017
store i32 %add6, i32* %arrayidx7, align 4
br label %for.inc
for.inc:
%inc = add nuw nsw i32 %i.017, 1
%exitcond = icmp ne i32 %inc, %N
br i1 %exitcond, label %for.body, label %for.cond.cleanup
}
; CHECK-LABEL: test_inc_slt(
; CHECK: main.exit.selector:
; CHECK: [[PSEUDO_PHI:%[^ ]+]] = phi i32 [ %inc, %for.inc ]
; CHECK: [[COND:%[^ ]+]] = icmp slt i32 [[PSEUDO_PHI]], %N
; CHECK: br i1 [[COND]], label %main.pseudo.exit, label %for.cond.cleanup.loopexit
define void @test_inc_slt(i32* nocapture %a, i32* nocapture readonly %b, i32* nocapture readonly %c, i32 %N) {
entry:
%cmp16 = icmp sgt i32 %N, 0
br i1 %cmp16, label %for.body, label %for.cond.cleanup
for.cond.cleanup:
ret void
for.body:
%i.017 = phi i32 [ %inc, %for.inc ], [ 0, %entry ]
%cmp1 = icmp ult i32 %i.017, 512
%arrayidx = getelementptr inbounds i32, i32* %b, i32 %i.017
%0 = load i32, i32* %arrayidx, align 4
%arrayidx2 = getelementptr inbounds i32, i32* %c, i32 %i.017
%1 = load i32, i32* %arrayidx2, align 4
br i1 %cmp1, label %if.then, label %if.else
if.then:
%sub = sub i32 %0, %1
%arrayidx3 = getelementptr inbounds i32, i32* %a, i32 %i.017
%2 = load i32, i32* %arrayidx3, align 4
%add = add nsw i32 %sub, %2
store i32 %add, i32* %arrayidx3, align 4
br label %for.inc
if.else:
%add6 = add nsw i32 %1, %0
%arrayidx7 = getelementptr inbounds i32, i32* %a, i32 %i.017
store i32 %add6, i32* %arrayidx7, align 4
br label %for.inc
for.inc:
%inc = add nuw nsw i32 %i.017, 1
%exitcond = icmp slt i32 %inc, %N
br i1 %exitcond, label %for.body, label %for.cond.cleanup
}
; CHECK-LABEL: test_inc_ult
; CHECK: main.exit.selector:
; CHECK: [[PSEUDO_PHI:%[^ ]+]] = phi i32 [ %inc, %for.inc ]
; CHECK: [[COND:%[^ ]+]] = icmp ult i32 [[PSEUDO_PHI]], %N
; CHECK: br i1 [[COND]], label %main.pseudo.exit, label %for.cond.cleanup.loopexit
define void @test_inc_ult(i32* nocapture %a, i32* nocapture readonly %b, i32* nocapture readonly %c, i32 %N) {
entry:
%cmp16 = icmp ugt i32 %N, 0
br i1 %cmp16, label %for.body, label %for.cond.cleanup
for.cond.cleanup:
ret void
for.body:
%i.017 = phi i32 [ %inc, %for.inc ], [ 0, %entry ]
%cmp1 = icmp ult i32 %i.017, 512
%arrayidx = getelementptr inbounds i32, i32* %b, i32 %i.017
%0 = load i32, i32* %arrayidx, align 4
%arrayidx2 = getelementptr inbounds i32, i32* %c, i32 %i.017
%1 = load i32, i32* %arrayidx2, align 4
br i1 %cmp1, label %if.then, label %if.else
if.then:
%sub = sub i32 %0, %1
%arrayidx3 = getelementptr inbounds i32, i32* %a, i32 %i.017
%2 = load i32, i32* %arrayidx3, align 4
%add = add nsw i32 %sub, %2
store i32 %add, i32* %arrayidx3, align 4
br label %for.inc
if.else:
%add6 = add nsw i32 %1, %0
%arrayidx7 = getelementptr inbounds i32, i32* %a, i32 %i.017
store i32 %add6, i32* %arrayidx7, align 4
br label %for.inc
for.inc:
%inc = add nuw nsw i32 %i.017, 1
%exitcond = icmp ult i32 %inc, %N
br i1 %exitcond, label %for.body, label %for.cond.cleanup
}
; CHECK-LABEL: signed_var_imm_dec_sgt(
; CHECK: main.exit.selector:
; CHECK: [[PSEUDO_PHI:%[^ ]+]] = phi i32 [ %dec, %for.inc ]
; CHECK: [[COND:%[^ ]+]] = icmp sgt i32 [[PSEUDO_PHI]], %M
; CHECK: br i1 [[COND]]
define void @signed_var_imm_dec_sgt(i32* nocapture %a, i32* nocapture readonly %b, i32* nocapture readonly %c, i32 %M) {
entry:
%cmp14 = icmp slt i32 %M, 1024
br i1 %cmp14, label %for.body, label %for.cond.cleanup
for.cond.cleanup: ; preds = %for.inc, %entry
ret void
for.body: ; preds = %entry, %for.inc
%iv = phi i32 [ %dec, %for.inc ], [ 1024, %entry ]
%cmp1 = icmp slt i32 %iv, 1024
%arrayidx = getelementptr inbounds i32, i32* %b, i32 %iv
%0 = load i32, i32* %arrayidx, align 4
%arrayidx2 = getelementptr inbounds i32, i32* %c, i32 %iv
%1 = load i32, i32* %arrayidx2, align 4
%mul = mul nsw i32 %1, %0
%arrayidx3 = getelementptr inbounds i32, i32* %a, i32 %iv
br i1 %cmp1, label %for.inc, label %if.else
if.else: ; preds = %for.body
%2 = load i32, i32* %arrayidx3, align 4
%add = add nsw i32 %2, %mul
br label %for.inc
for.inc: ; preds = %for.body, %if.else
%storemerge = phi i32 [ %add, %if.else ], [ %mul, %for.body ]
store i32 %storemerge, i32* %arrayidx3, align 4
%dec = add nsw i32 %iv, -1
%cmp = icmp sgt i32 %dec, %M
br i1 %cmp, label %for.body, label %for.cond.cleanup
}
; CHECK-LABEL: signed_var_imm_dec_sge(
; CHECK: main.exit.selector: ; preds = %for.inc
; CHECK: [[PSEUDO_PHI:%[^ ]+]] = phi i32 [ %iv, %for.inc ]
; CHECK: [[COND:%[^ ]+]] = icmp sgt i32 [[PSEUDO_PHI]], %M
; CHECK: br i1 [[COND]]
define void @signed_var_imm_dec_sge(i32* nocapture %a, i32* nocapture readonly %b, i32* nocapture readonly %c, i32 %M) {
entry:
%cmp14 = icmp sgt i32 %M, 1024
br i1 %cmp14, label %for.cond.cleanup, label %for.body
for.cond.cleanup: ; preds = %for.inc, %entry
ret void
for.body: ; preds = %entry, %for.inc
%iv = phi i32 [ %dec, %for.inc ], [ 1024, %entry ]
%cmp1 = icmp slt i32 %iv, 1024
%arrayidx = getelementptr inbounds i32, i32* %b, i32 %iv
%0 = load i32, i32* %arrayidx, align 4
%arrayidx2 = getelementptr inbounds i32, i32* %c, i32 %iv
%1 = load i32, i32* %arrayidx2, align 4
%mul = mul nsw i32 %1, %0
%arrayidx3 = getelementptr inbounds i32, i32* %a, i32 %iv
br i1 %cmp1, label %for.inc, label %if.else
if.else: ; preds = %for.body
%2 = load i32, i32* %arrayidx3, align 4
%add = add nsw i32 %2, %mul
br label %for.inc
for.inc: ; preds = %for.body, %if.else
%storemerge = phi i32 [ %add, %if.else ], [ %mul, %for.body ]
store i32 %storemerge, i32* %arrayidx3, align 4
%dec = add nsw i32 %iv, -1
%cmp = icmp sgt i32 %iv, %M
br i1 %cmp, label %for.body, label %for.cond.cleanup
}
define void @signed_var_imm_dec_slt(i32* nocapture %a, i32* nocapture readonly %b, i32* nocapture readonly %c, i32 %M) {
entry:
%cmp14 = icmp sgt i32 %M, 1024
br i1 %cmp14, label %for.cond.cleanup, label %for.body
for.cond.cleanup: ; preds = %for.inc, %entry
ret void
for.body: ; preds = %entry, %for.inc
%iv = phi i32 [ %dec, %for.inc ], [ 1024, %entry ]
%cmp1 = icmp slt i32 %iv, 1024
%arrayidx = getelementptr inbounds i32, i32* %b, i32 %iv
%0 = load i32, i32* %arrayidx, align 4
%arrayidx2 = getelementptr inbounds i32, i32* %c, i32 %iv
%1 = load i32, i32* %arrayidx2, align 4
%mul = mul nsw i32 %1, %0
%arrayidx3 = getelementptr inbounds i32, i32* %a, i32 %iv
br i1 %cmp1, label %for.inc, label %if.else
if.else: ; preds = %for.body
%2 = load i32, i32* %arrayidx3, align 4
%add = add nsw i32 %2, %mul
br label %for.inc
for.inc: ; preds = %for.body, %if.else
%storemerge = phi i32 [ %add, %if.else ], [ %mul, %for.body ]
store i32 %storemerge, i32* %arrayidx3, align 4
%dec = add nsw i32 %iv, -1
%cmp = icmp slt i32 %iv, %M
br i1 %cmp, label %for.cond.cleanup, label %for.body
}
; CHECK-LABEL: signed_var_imm_dec_ne(
; CHECK: main.exit.selector: ; preds = %for.inc
; CHECK: [[PSEUDO_PHI:%[^ ]+]] = phi i32 [ %dec, %for.inc ]
; CHECK: [[COND:%[^ ]+]] = icmp sgt i32 [[PSEUDO_PHI]], %M
; CHECK: br i1 [[COND]]
define void @signed_var_imm_dec_ne(i32* nocapture %a, i32* nocapture readonly %b, i32* nocapture readonly %c, i32 %M) {
entry:
%cmp14 = icmp slt i32 %M, 1024
br i1 %cmp14, label %for.body, label %for.cond.cleanup
for.cond.cleanup: ; preds = %for.inc, %entry
ret void
for.body: ; preds = %entry, %for.inc
%iv = phi i32 [ %dec, %for.inc ], [ 1024, %entry ]
%cmp1 = icmp slt i32 %iv, 1024
%arrayidx = getelementptr inbounds i32, i32* %b, i32 %iv
%0 = load i32, i32* %arrayidx, align 4
%arrayidx2 = getelementptr inbounds i32, i32* %c, i32 %iv
%1 = load i32, i32* %arrayidx2, align 4
%mul = mul nsw i32 %1, %0
%arrayidx3 = getelementptr inbounds i32, i32* %a, i32 %iv
br i1 %cmp1, label %for.inc, label %if.else
if.else: ; preds = %for.body
%2 = load i32, i32* %arrayidx3, align 4
%add = add nsw i32 %2, %mul
br label %for.inc
for.inc: ; preds = %for.body, %if.else
%storemerge = phi i32 [ %add, %if.else ], [ %mul, %for.body ]
store i32 %storemerge, i32* %arrayidx3, align 4
%dec = add nsw i32 %iv, -1
%cmp = icmp ne i32 %dec, %M
br i1 %cmp, label %for.body, label %for.cond.cleanup
}
define void @signed_var_imm_dec_eq(i32* nocapture %a, i32* nocapture readonly %b, i32* nocapture readonly %c, i32 %M) {
entry:
%cmp14 = icmp slt i32 %M, 1024
br i1 %cmp14, label %for.body, label %for.cond.cleanup
for.cond.cleanup: ; preds = %for.inc, %entry
ret void
for.body: ; preds = %entry, %for.inc
%iv = phi i32 [ %dec, %for.inc ], [ 1024, %entry ]
%cmp1 = icmp slt i32 %iv, 1024
%arrayidx = getelementptr inbounds i32, i32* %b, i32 %iv
%0 = load i32, i32* %arrayidx, align 4
%arrayidx2 = getelementptr inbounds i32, i32* %c, i32 %iv
%1 = load i32, i32* %arrayidx2, align 4
%mul = mul nsw i32 %1, %0
%arrayidx3 = getelementptr inbounds i32, i32* %a, i32 %iv
br i1 %cmp1, label %for.inc, label %if.else
if.else: ; preds = %for.body
%2 = load i32, i32* %arrayidx3, align 4
%add = add nsw i32 %2, %mul
br label %for.inc
for.inc: ; preds = %for.body, %if.else
%storemerge = phi i32 [ %add, %if.else ], [ %mul, %for.body ]
store i32 %storemerge, i32* %arrayidx3, align 4
%dec = add nsw i32 %iv, -1
%cmp = icmp eq i32 %dec, %M
br i1 %cmp, label %for.cond.cleanup, label %for.body
}
; CHECK-LABEL: @test_dec_bound_with_smaller_start_than_bound(
; CHECK-NOT: preloop.exit.selector:
define void @test_dec_bound_with_smaller_start_than_bound(i64 %0) {
entry:
br label %for.body
for.body: ; preds = %for.dec, %entry
%iv = phi i64 [ %dec, %for.dec ], [ 0, %entry ]
%1 = icmp slt i64 %iv, %0
br i1 %1, label %if.else, label %for.dec
if.else: ; preds = %for.body
br label %for.dec
for.dec: ; preds = %if.else, %for.body
%dec = sub nuw nsw i64 %iv, 1
%2 = icmp slt i64 %dec, 1
br i1 %2, label %exit, label %for.body
exit: ; preds = %for.dec
ret void
}
; CHECK-LABEL: @test_inc_bound_with_bigger_start_than_bound(
; CHECK-NOT: main.exit.selector:
define void @test_inc_bound_with_bigger_start_than_bound(i32 %0) {
entry:
br label %for.body
for.body: ; preds = %for.inc, %entry
%iv = phi i32 [ %inc, %for.inc ], [ 200, %entry ]
%1 = icmp slt i32 %iv, %0
br i1 %1, label %if.else, label %for.inc
if.else: ; preds = %for.body
br label %for.inc
for.inc: ; preds = %if.else, %for.body
%inc = add nsw i32 %iv, 1
%2 = icmp sgt i32 %inc, 100
br i1 %2, label %exit, label %for.body
exit: ; preds = %for.inc
ret void
}
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