196 lines
7 KiB
LLVM
196 lines
7 KiB
LLVM
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 2
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; RUN: opt -S -passes=indvars < %s | FileCheck %s
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; Check that SCEV is able to recognize and use guards to prove
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; conditions gaurding loop entries and backedges. This isn't intended
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; to be a comprehensive test of SCEV's simplification capabilities,
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; tests directly testing e.g. if SCEV can elide a sext should go
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; elsewhere.
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target datalayout = "n8:16:32:64"
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declare void @llvm.experimental.guard(i1, ...)
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declare void @use(i64 %x)
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define void @test_1(ptr %cond_buf, ptr %len_buf) {
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; CHECK-LABEL: define void @test_1
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; CHECK-SAME: (ptr [[COND_BUF:%.*]], ptr [[LEN_BUF:%.*]]) {
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[LEN:%.*]] = load i32, ptr [[LEN_BUF]], align 4, !range [[RNG0:![0-9]+]]
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; CHECK-NEXT: br label [[LOOP:%.*]]
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; CHECK: loop:
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; CHECK-NEXT: [[IV:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[IV_INC:%.*]], [[LOOP]] ]
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; CHECK-NEXT: [[IV_INC]] = add nsw i32 [[IV]], 1
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; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 true) [ "deopt"() ]
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; CHECK-NEXT: [[IV_INC_CMP:%.*]] = icmp ult i32 [[IV_INC]], [[LEN]]
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; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 [[IV_INC_CMP]]) [ "deopt"() ]
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; CHECK-NEXT: [[BECOND:%.*]] = load volatile i1, ptr [[COND_BUF]], align 1
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; CHECK-NEXT: br i1 [[BECOND]], label [[LOOP]], label [[LEAVE:%.*]]
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; CHECK: leave:
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; CHECK-NEXT: ret void
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;
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entry:
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%len = load i32, ptr %len_buf, !range !{i32 1, i32 2147483648}
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br label %loop
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loop:
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%iv = phi i32 [ 0, %entry ], [ %iv.inc, %loop ]
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%iv.inc = add i32 %iv, 1
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%iv.cmp = icmp slt i32 %iv, %len
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call void(i1, ...) @llvm.experimental.guard(i1 %iv.cmp) [ "deopt"() ]
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%iv.inc.cmp = icmp slt i32 %iv.inc, %len
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call void(i1, ...) @llvm.experimental.guard(i1 %iv.inc.cmp) [ "deopt"() ]
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%becond = load volatile i1, ptr %cond_buf
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br i1 %becond, label %loop, label %leave
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leave:
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ret void
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}
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define void @test_2(i32 %n, ptr %len_buf) {
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; CHECK-LABEL: define void @test_2
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; CHECK-SAME: (i32 [[N:%.*]], ptr [[LEN_BUF:%.*]]) {
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[LEN:%.*]] = load i32, ptr [[LEN_BUF]], align 4, !range [[RNG1:![0-9]+]]
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; CHECK-NEXT: [[TMP0:%.*]] = zext i32 [[LEN]] to i64
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; CHECK-NEXT: [[TMP1:%.*]] = zext i32 [[N]] to i64
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; CHECK-NEXT: br label [[LOOP:%.*]]
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; CHECK: loop:
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; CHECK-NEXT: [[INDVARS_IV:%.*]] = phi i64 [ [[INDVARS_IV_NEXT:%.*]], [[LOOP]] ], [ 0, [[ENTRY:%.*]] ]
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; CHECK-NEXT: [[INDVARS_IV_NEXT]] = add nuw nsw i64 [[INDVARS_IV]], 1
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; CHECK-NEXT: call void @use(i64 [[INDVARS_IV]])
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; CHECK-NEXT: [[IV_INC_CMP:%.*]] = icmp ult i64 [[INDVARS_IV_NEXT]], [[TMP0]]
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; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 [[IV_INC_CMP]]) [ "deopt"() ]
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; CHECK-NEXT: [[BECOND:%.*]] = icmp ne i64 [[INDVARS_IV]], [[TMP1]]
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; CHECK-NEXT: br i1 [[BECOND]], label [[LOOP]], label [[LEAVE:%.*]]
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; CHECK: leave:
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; CHECK-NEXT: ret void
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;
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entry:
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%len = load i32, ptr %len_buf, !range !{i32 0, i32 2147483648}
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br label %loop
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loop:
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%iv = phi i32 [ 0, %entry ], [ %iv.inc, %loop ]
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%iv.inc = add i32 %iv, 1
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%iv.sext = sext i32 %iv to i64
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call void @use(i64 %iv.sext)
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%iv.inc.cmp = icmp slt i32 %iv.inc, %len
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call void(i1, ...) @llvm.experimental.guard(i1 %iv.inc.cmp) [ "deopt"() ]
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%becond = icmp ne i32 %iv, %n
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br i1 %becond, label %loop, label %leave
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leave:
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ret void
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}
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define void @test_3(ptr %cond_buf, ptr %len_buf) {
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; CHECK-LABEL: define void @test_3
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; CHECK-SAME: (ptr [[COND_BUF:%.*]], ptr [[LEN_BUF:%.*]]) {
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[LEN:%.*]] = load i32, ptr [[LEN_BUF]], align 4
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; CHECK-NEXT: [[ENTRY_COND:%.*]] = icmp sgt i32 [[LEN]], 0
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; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 [[ENTRY_COND]]) [ "deopt"() ]
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; CHECK-NEXT: br label [[LOOP:%.*]]
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; CHECK: loop:
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; CHECK-NEXT: [[IV:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[IV_INC:%.*]], [[LOOP]] ]
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; CHECK-NEXT: [[IV_INC]] = add nsw i32 [[IV]], 1
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; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 true) [ "deopt"() ]
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; CHECK-NEXT: [[IV_INC_CMP:%.*]] = icmp slt i32 [[IV_INC]], [[LEN]]
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; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 [[IV_INC_CMP]]) [ "deopt"() ]
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; CHECK-NEXT: [[BECOND:%.*]] = load volatile i1, ptr [[COND_BUF]], align 1
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; CHECK-NEXT: br i1 [[BECOND]], label [[LOOP]], label [[LEAVE:%.*]]
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; CHECK: leave:
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; CHECK-NEXT: ret void
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;
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entry:
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%len = load i32, ptr %len_buf
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%entry.cond = icmp sgt i32 %len, 0
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call void(i1, ...) @llvm.experimental.guard(i1 %entry.cond) [ "deopt"() ]
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br label %loop
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loop:
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%iv = phi i32 [ 0, %entry ], [ %iv.inc, %loop ]
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%iv.inc = add i32 %iv, 1
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%iv.cmp = icmp slt i32 %iv, %len
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call void(i1, ...) @llvm.experimental.guard(i1 %iv.cmp) [ "deopt"() ]
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%iv.inc.cmp = icmp slt i32 %iv.inc, %len
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call void(i1, ...) @llvm.experimental.guard(i1 %iv.inc.cmp) [ "deopt"() ]
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%becond = load volatile i1, ptr %cond_buf
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br i1 %becond, label %loop, label %leave
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leave:
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ret void
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}
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define void @test_4(ptr %cond_buf, ptr %len_buf) {
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; CHECK-LABEL: define void @test_4
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; CHECK-SAME: (ptr [[COND_BUF:%.*]], ptr [[LEN_BUF:%.*]]) {
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[LEN:%.*]] = load i32, ptr [[LEN_BUF]], align 4
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; CHECK-NEXT: [[ENTRY_COND:%.*]] = icmp sgt i32 [[LEN]], 0
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; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 [[ENTRY_COND]]) [ "deopt"() ]
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; CHECK-NEXT: br label [[LOOP:%.*]]
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; CHECK: loop:
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; CHECK-NEXT: [[IV:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[IV_INC:%.*]], [[BE:%.*]] ]
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; CHECK-NEXT: [[IV_INC]] = add i32 [[IV]], 1
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; CHECK-NEXT: [[COND:%.*]] = load volatile i1, ptr [[COND_BUF]], align 1
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; CHECK-NEXT: br i1 [[COND]], label [[LEFT:%.*]], label [[BE]]
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; CHECK: left:
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; CHECK-NEXT: [[IV_INC_CMP:%.*]] = icmp slt i32 [[IV_INC]], [[LEN]]
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; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 [[IV_INC_CMP]]) [ "deopt"() ]
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; CHECK-NEXT: br label [[BE]]
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; CHECK: be:
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; CHECK-NEXT: [[IV_CMP:%.*]] = icmp slt i32 [[IV]], [[LEN]]
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; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 [[IV_CMP]]) [ "deopt"() ]
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; CHECK-NEXT: [[BECOND:%.*]] = load volatile i1, ptr [[COND_BUF]], align 1
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; CHECK-NEXT: br i1 [[BECOND]], label [[LOOP]], label [[LEAVE:%.*]]
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; CHECK: leave:
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; CHECK-NEXT: ret void
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;
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entry:
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%len = load i32, ptr %len_buf
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%entry.cond = icmp sgt i32 %len, 0
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call void(i1, ...) @llvm.experimental.guard(i1 %entry.cond) [ "deopt"() ]
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br label %loop
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loop:
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%iv = phi i32 [ 0, %entry ], [ %iv.inc, %be ]
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%iv.inc = add i32 %iv, 1
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%cond = load volatile i1, ptr %cond_buf
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br i1 %cond, label %left, label %be
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left:
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; Does not dominate the backedge, so cannot be used in the inductive proof
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%iv.inc.cmp = icmp slt i32 %iv.inc, %len
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call void(i1, ...) @llvm.experimental.guard(i1 %iv.inc.cmp) [ "deopt"() ]
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br label %be
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be:
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%iv.cmp = icmp slt i32 %iv, %len
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call void(i1, ...) @llvm.experimental.guard(i1 %iv.cmp) [ "deopt"() ]
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%becond = load volatile i1, ptr %cond_buf
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br i1 %becond, label %loop, label %leave
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leave:
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ret void
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}
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