145 lines
4.0 KiB
LLVM
145 lines
4.0 KiB
LLVM
; RUN: opt -S -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(i1* %cond_buf, i32* %len_buf) {
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; CHECK-LABEL: @test_1(
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entry:
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%len = load i32, i32* %len_buf, !range !{i32 1, i32 2147483648}
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br label %loop
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loop:
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; CHECK: loop:
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; CHECK: call void (i1, ...) @llvm.experimental.guard(i1 true) [ "deopt"() ]
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; CHECK: %iv.inc.cmp = icmp ult i32 %iv.inc, %len
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; CHECK: call void (i1, ...) @llvm.experimental.guard(i1 %iv.inc.cmp) [ "deopt"() ]
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; CHECK: leave:
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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, i1* %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, i32* %len_buf) {
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; CHECK-LABEL: @test_2(
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; CHECK: [[LEN_ZEXT:%[^ ]+]] = zext i32 %len to i64
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; CHECK: br label %loop
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entry:
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%len = load i32, i32* %len_buf, !range !{i32 0, i32 2147483648}
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br label %loop
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loop:
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; CHECK: loop:
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; CHECK: %indvars.iv = phi i64 [ %indvars.iv.next, %loop ], [ 0, %entry ]
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; CHECK: %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
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; CHECK: %iv.inc.cmp = icmp ult i64 %indvars.iv.next, [[LEN_ZEXT]]
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; CHECK: call void (i1, ...) @llvm.experimental.guard(i1 %iv.inc.cmp) [ "deopt"() ]
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; CHECK: leave:
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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(i1* %cond_buf, i32* %len_buf) {
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; CHECK-LABEL: @test_3(
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entry:
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%len = load i32, i32* %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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; CHECK: loop:
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; CHECK: call void (i1, ...) @llvm.experimental.guard(i1 true) [ "deopt"() ]
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; CHECK: %iv.inc.cmp = icmp slt i32 %iv.inc, %len
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; CHECK: call void (i1, ...) @llvm.experimental.guard(i1 %iv.inc.cmp) [ "deopt"() ]
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; CHECK: leave:
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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, i1* %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(i1* %cond_buf, i32* %len_buf) {
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; CHECK-LABEL: @test_4(
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entry:
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%len = load i32, i32* %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, i1* %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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; 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: leave:
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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, i1* %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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