92 lines
4.2 KiB
LLVM
92 lines
4.2 KiB
LLVM
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; RUN: llc < %s -march=x86 -regalloc=greedy --debug-only=regalloc 2>&1 | FileCheck %s
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; REQUIRES: asserts
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; This test is meant to make sure that the weight of local intervals that are
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; created during split is taken into account when choosing the best candidate
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; register.
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; %shl is the interval that will be split.
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; The inline assembly calls interfere with %shl and make only 2 available split
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; candidates - %esi and %ebp.
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; The old code would have chosen %esi as the split candidate ignoring the fact
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; that this choice will cause the creation of a local interval that will have a
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; certain spill cost.
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; The new code choses %ebp as the split candidate as it has lower spill cost.
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; Make sure the split behaves as expected
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; CHECK: RS_Split Cascade 1
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; CHECK-NOT: $eax static =
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; CHECK: $eax no positive bundles
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; CHECK-NEXT: $ecx no positive bundles
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; CHECK-NEXT: $edx no positive bundles
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; CHECK-NEXT: $esi static =
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; CHECK-NEXT: $edi no positive bundles
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; CHECK-NEXT: $ebx no positive bundles
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; CHECK-NEXT: $ebp static =
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; CHECK: Split for $ebp
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; Function Attrs: nounwind
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define i32 @foo(i32* %array, i32 %cond1, i32 %val) local_unnamed_addr #0 {
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entry:
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%array.addr = alloca i32*, align 4
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store i32* %array, i32** %array.addr, align 4, !tbaa !3
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%0 = load i32, i32* %array, align 4, !tbaa !7
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%arrayidx1 = getelementptr inbounds i32, i32* %array, i32 1
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%1 = load i32, i32* %arrayidx1, align 4, !tbaa !7
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%arrayidx2 = getelementptr inbounds i32, i32* %array, i32 2
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%2 = load i32, i32* %arrayidx2, align 4, !tbaa !7
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%arrayidx3 = getelementptr inbounds i32, i32* %array, i32 3
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%3 = load i32, i32* %arrayidx3, align 4, !tbaa !7
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%arrayidx4 = getelementptr inbounds i32, i32* %array, i32 4
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%4 = load i32, i32* %arrayidx4, align 4, !tbaa !7
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%arrayidx6 = getelementptr inbounds i32, i32* %array, i32 %val
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%5 = load i32, i32* %arrayidx6, align 4, !tbaa !7
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%shl = shl i32 %5, 5
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%tobool = icmp eq i32 %cond1, 0
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br i1 %tobool, label %if.else, label %if.then
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if.then: ; preds = %entry
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%arrayidx7 = getelementptr inbounds i32, i32* %array, i32 6
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store i32 %shl, i32* %arrayidx7, align 4, !tbaa !7
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call void asm "nop", "=*m,r,r,r,r,r,*m,~{dirflag},~{fpsr},~{flags}"(i32** nonnull %array.addr, i32 %0, i32 %1, i32 %2, i32 %3, i32 %4, i32** nonnull %array.addr) #1, !srcloc !9
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%6 = load i32*, i32** %array.addr, align 4, !tbaa !3
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%arrayidx8 = getelementptr inbounds i32, i32* %6, i32 7
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br label %if.end
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if.else: ; preds = %entry
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%arrayidx5 = getelementptr inbounds i32, i32* %array, i32 5
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%7 = load i32, i32* %arrayidx5, align 4, !tbaa !7
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%arrayidx9 = getelementptr inbounds i32, i32* %array, i32 8
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store i32 %shl, i32* %arrayidx9, align 4, !tbaa !7
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call void asm "nop", "=*m,{ax},{bx},{cx},{dx},{di},{si},{ebp},*m,~{dirflag},~{fpsr},~{flags}"(i32** nonnull %array.addr, i32 %0, i32 %1, i32 %2, i32 %3, i32 %4, i32 %7, i32* undef, i32** nonnull %array.addr) #1, !srcloc !10
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%8 = load i32*, i32** %array.addr, align 4, !tbaa !3
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%arrayidx10 = getelementptr inbounds i32, i32* %8, i32 9
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br label %if.end
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if.end: ; preds = %if.else, %if.then
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%arrayidx10.sink = phi i32* [ %arrayidx10, %if.else ], [ %arrayidx8, %if.then ]
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%9 = phi i32* [ %8, %if.else ], [ %6, %if.then ]
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store i32 %shl, i32* %arrayidx10.sink, align 4, !tbaa !7
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%10 = load i32, i32* %9, align 4, !tbaa !7
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%add = add nsw i32 %10, %shl
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ret i32 %add
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}
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attributes #0 = { nounwind "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "frame-pointer"="none" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "target-features"="+x87" "unsafe-fp-math"="false" "use-soft-float"="false" }
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attributes #1 = { nounwind }
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!llvm.module.flags = !{!0, !1}
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!llvm.ident = !{!2}
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!0 = !{i32 1, !"NumRegisterParameters", i32 0}
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!1 = !{i32 1, !"wchar_size", i32 4}
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!2 = !{!"clang version 6.0.0"}
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!3 = !{!4, !4, i64 0}
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!4 = !{!"any pointer", !5, i64 0}
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!5 = !{!"omnipotent char", !6, i64 0}
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!6 = !{!"Simple C/C++ TBAA"}
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!7 = !{!8, !8, i64 0}
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!8 = !{!"int", !5, i64 0}
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!9 = !{i32 268}
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!10 = !{i32 390}
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