189 lines
5.9 KiB
LLVM
189 lines
5.9 KiB
LLVM
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; RUN: opt -S -licm < %s | FileCheck %s
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; RUN: opt -passes='require<aa>,require<targetir>,require<scalar-evolution>,require<opt-remark-emit>,loop(licm)' -S %s | FileCheck %s
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; UDiv is safe to speculate if the denominator is known non-zero.
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; CHECK-LABEL: @safe_udiv(
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; CHECK: %div = udiv i64 %x, 2
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; CHECK-NEXT: br label %for.body
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define void @safe_udiv(i64 %x, i64 %m, i64 %n, i32* %p, i64* %q) nounwind {
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entry:
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br label %for.body
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for.body: ; preds = %entry, %for.inc
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%i.02 = phi i64 [ %inc, %for.inc ], [ 0, %entry ]
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%arrayidx = getelementptr inbounds i32, i32* %p, i64 %i.02
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%0 = load i32, i32* %arrayidx, align 4
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%tobool = icmp eq i32 %0, 0
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br i1 %tobool, label %for.inc, label %if.then
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if.then: ; preds = %for.body
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%div = udiv i64 %x, 2
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%arrayidx1 = getelementptr inbounds i64, i64* %q, i64 %i.02
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store i64 %div, i64* %arrayidx1, align 8
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br label %for.inc
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for.inc: ; preds = %if.then, %for.body
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%inc = add i64 %i.02, 1
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%cmp = icmp slt i64 %inc, %n
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br i1 %cmp, label %for.body, label %for.end
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for.end: ; preds = %for.inc, %entry
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ret void
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}
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; UDiv is unsafe to speculate if the denominator is not known non-zero.
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; CHECK-LABEL: @unsafe_udiv(
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; CHECK-NOT: udiv
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; CHECK: for.body:
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define void @unsafe_udiv(i64 %x, i64 %m, i64 %n, i32* %p, i64* %q) nounwind {
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entry:
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br label %for.body
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for.body: ; preds = %entry, %for.inc
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%i.02 = phi i64 [ %inc, %for.inc ], [ 0, %entry ]
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%arrayidx = getelementptr inbounds i32, i32* %p, i64 %i.02
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%0 = load i32, i32* %arrayidx, align 4
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%tobool = icmp eq i32 %0, 0
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br i1 %tobool, label %for.inc, label %if.then
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if.then: ; preds = %for.body
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%div = udiv i64 %x, %m
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%arrayidx1 = getelementptr inbounds i64, i64* %q, i64 %i.02
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store i64 %div, i64* %arrayidx1, align 8
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br label %for.inc
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for.inc: ; preds = %if.then, %for.body
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%inc = add i64 %i.02, 1
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%cmp = icmp slt i64 %inc, %n
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br i1 %cmp, label %for.body, label %for.end
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for.end: ; preds = %for.inc, %entry
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ret void
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}
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; SDiv is safe to speculate if the denominator is known non-zero and
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; known to have at least one zero bit.
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; CHECK-LABEL: @safe_sdiv(
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; CHECK: %div = sdiv i64 %x, 2
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; CHECK-NEXT: br label %for.body
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define void @safe_sdiv(i64 %x, i64 %m, i64 %n, i32* %p, i64* %q) nounwind {
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entry:
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%and = and i64 %m, -3
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br label %for.body
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for.body: ; preds = %entry, %for.inc
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%i.02 = phi i64 [ %inc, %for.inc ], [ 0, %entry ]
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%arrayidx = getelementptr inbounds i32, i32* %p, i64 %i.02
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%0 = load i32, i32* %arrayidx, align 4
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%tobool = icmp eq i32 %0, 0
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br i1 %tobool, label %for.inc, label %if.then
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if.then: ; preds = %for.body
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%div = sdiv i64 %x, 2
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%arrayidx1 = getelementptr inbounds i64, i64* %q, i64 %i.02
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store i64 %div, i64* %arrayidx1, align 8
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br label %for.inc
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for.inc: ; preds = %if.then, %for.body
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%inc = add i64 %i.02, 1
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%cmp = icmp slt i64 %inc, %n
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br i1 %cmp, label %for.body, label %for.end
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for.end: ; preds = %for.inc, %entry
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ret void
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}
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; SDiv is unsafe to speculate if the denominator is not known non-zero.
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; CHECK-LABEL: @unsafe_sdiv_a(
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; CHECK-NOT: sdiv
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; CHECK: for.body:
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define void @unsafe_sdiv_a(i64 %x, i64 %m, i64 %n, i32* %p, i64* %q) nounwind {
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entry:
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%or = or i64 %m, 1
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br label %for.body
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for.body: ; preds = %entry, %for.inc
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%i.02 = phi i64 [ %inc, %for.inc ], [ 0, %entry ]
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%arrayidx = getelementptr inbounds i32, i32* %p, i64 %i.02
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%0 = load i32, i32* %arrayidx, align 4
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%tobool = icmp eq i32 %0, 0
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br i1 %tobool, label %for.inc, label %if.then
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if.then: ; preds = %for.body
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%div = sdiv i64 %x, %or
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%arrayidx1 = getelementptr inbounds i64, i64* %q, i64 %i.02
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store i64 %div, i64* %arrayidx1, align 8
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br label %for.inc
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for.inc: ; preds = %if.then, %for.body
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%inc = add i64 %i.02, 1
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%cmp = icmp slt i64 %inc, %n
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br i1 %cmp, label %for.body, label %for.end
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for.end: ; preds = %for.inc, %entry
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ret void
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}
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; SDiv is unsafe to speculate if the denominator is not known to have a zero bit.
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; CHECK-LABEL: @unsafe_sdiv_b(
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; CHECK-NOT: sdiv
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; CHECK: for.body:
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define void @unsafe_sdiv_b(i64 %x, i64 %m, i64 %n, i32* %p, i64* %q) nounwind {
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entry:
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%and = and i64 %m, -3
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br label %for.body
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for.body: ; preds = %entry, %for.inc
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%i.02 = phi i64 [ %inc, %for.inc ], [ 0, %entry ]
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%arrayidx = getelementptr inbounds i32, i32* %p, i64 %i.02
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%0 = load i32, i32* %arrayidx, align 4
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%tobool = icmp eq i32 %0, 0
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br i1 %tobool, label %for.inc, label %if.then
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if.then: ; preds = %for.body
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%div = sdiv i64 %x, %and
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%arrayidx1 = getelementptr inbounds i64, i64* %q, i64 %i.02
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store i64 %div, i64* %arrayidx1, align 8
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br label %for.inc
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for.inc: ; preds = %if.then, %for.body
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%inc = add i64 %i.02, 1
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%cmp = icmp slt i64 %inc, %n
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br i1 %cmp, label %for.body, label %for.end
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for.end: ; preds = %for.inc, %entry
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ret void
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}
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; SDiv is unsafe to speculate inside an infinite loop.
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define void @unsafe_sdiv_c(i64 %a, i64 %b, i64* %p) {
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entry:
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; CHECK: entry:
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; CHECK-NOT: sdiv
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; CHECK: br label %for.body
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br label %for.body
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for.body:
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%c = icmp eq i64 %b, 0
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br i1 %c, label %backedge, label %if.then
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if.then:
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%d = sdiv i64 %a, %b
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store i64 %d, i64* %p
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br label %backedge
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backedge:
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br label %for.body
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}
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