derek.holloway
7502bf64a4
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144 lines
3.4 KiB
LLVM
144 lines
3.4 KiB
LLVM
; Tests to ensure that we are not placing backedge safepoints in
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; loops which are clearly finite.
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;; RUN: opt < %s -passes=place-safepoints -spp-counted-loop-trip-width=32 -S | FileCheck %s
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;; RUN: opt < %s -passes=place-safepoints -spp-counted-loop-trip-width=64 -S | FileCheck %s -check-prefix=COUNTED-64
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; A simple counted loop with trivially known range
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define void @test1(i32) gc "statepoint-example" {
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; CHECK-LABEL: test1
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; CHECK-LABEL: entry
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; CHECK: call void @do_safepoint
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; CHECK-LABEL: loop
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; CHECK-NOT: call void @do_safepoint
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; CHECK-LABEL: exit
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entry:
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br label %loop
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loop:
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%counter = phi i32 [ 0 , %entry ], [ %counter.inc , %loop ]
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%counter.inc = add i32 %counter, 1
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%counter.cmp = icmp slt i32 %counter.inc, 16
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br i1 %counter.cmp, label %loop, label %exit
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exit:
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ret void
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}
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; The same counted loop, but with an unknown early exit
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define void @test2(i1 %c, i32) gc "statepoint-example" {
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; CHECK-LABEL: test2
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; CHECK-LABEL: entry
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; CHECK: call void @do_safepoint
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; CHECK-LABEL: loop
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; CHECK-NOT: call void @do_safepoint
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; CHECK-LABEL: exit
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entry:
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br label %loop
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loop:
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%counter = phi i32 [ 0 , %entry ], [ %counter.inc , %continue ]
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%counter.inc = add i32 %counter, 1
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%counter.cmp = icmp slt i32 %counter.inc, 16
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br i1 %c, label %continue, label %exit
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continue:
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br i1 %counter.cmp, label %loop, label %exit
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exit:
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ret void
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}
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; The range is a 8 bit value and we can't overflow
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define void @test3(i8 %upper) gc "statepoint-example" {
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; CHECK-LABEL: test3
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; CHECK-LABEL: entry
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; CHECK: call void @do_safepoint
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; CHECK-LABEL: loop
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; CHECK-NOT: call void @do_safepoint
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; CHECK-LABEL: exit
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entry:
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br label %loop
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loop:
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%counter = phi i8 [ 0 , %entry ], [ %counter.inc , %loop ]
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%counter.inc = add nsw i8 %counter, 1
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%counter.cmp = icmp slt i8 %counter.inc, %upper
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br i1 %counter.cmp, label %loop, label %exit
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exit:
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ret void
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}
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; The range is a 64 bit value
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define void @test4(i64 %upper) gc "statepoint-example" {
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; CHECK-LABEL: test4
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; CHECK-LABEL: entry
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; CHECK: call void @do_safepoint
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; CHECK-LABEL: loop
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; CHECK: call void @do_safepoint
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; CHECK-LABEL: exit
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; COUNTED-64-LABEL: test4
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; COUNTED-64-LABEL: entry
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; COUNTED-64: call void @do_safepoint
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; COUNTED-64-LABEL: loop
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; COUNTED-64-NOT: call void @do_safepoint
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; COUNTED-64-LABEL: exit
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entry:
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br label %loop
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loop:
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%counter = phi i64 [ 0 , %entry ], [ %counter.inc , %loop ]
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%counter.inc = add i64 %counter, 1
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%counter.cmp = icmp slt i64 %counter.inc, %upper
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br i1 %counter.cmp, label %loop, label %exit
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exit:
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ret void
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}
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; This loop can run infinitely (for %upper == INT64_MAX) so it needs a
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; safepoint.
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define void @test5(i64 %upper) gc "statepoint-example" {
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; CHECK-LABEL: test5
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; CHECK-LABEL: entry
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; CHECK: call void @do_safepoint
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; CHECK-LABEL: loop
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; CHECK: call void @do_safepoint
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; CHECK-LABEL: exit
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; COUNTED-64-LABEL: test5
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; COUNTED-64-LABEL: entry
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; COUNTED-64: call void @do_safepoint
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; COUNTED-64-LABEL: loop
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; COUNTED-64: call void @do_safepoint
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; COUNTED-64-LABEL: exit
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entry:
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br label %loop
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loop:
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%counter = phi i64 [ 0 , %entry ], [ %counter.inc , %loop ]
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%counter.inc = add i64 %counter, 1
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%counter.cmp = icmp sle i64 %counter.inc, %upper
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br i1 %counter.cmp, label %loop, label %exit
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exit:
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ret void
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}
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; This function is inlined when inserting a poll.
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declare void @do_safepoint()
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define void @gc.safepoint_poll() {
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; CHECK-LABEL: gc.safepoint_poll
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entry:
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call void @do_safepoint()
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ret void
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}
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