158 lines
3.7 KiB
LLVM
158 lines
3.7 KiB
LLVM
; RUN: llc -march=x86-64 -asm-verbose=false < %s -jump-table-density=40 | FileCheck %s
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; This switch should use bit tests, and the third bit test case is just
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; testing for one possible value, so it doesn't need a bt.
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; CHECK: movabsq $2305843009482129440, %r
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; CHECK-NEXT: btq %rax, %r
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; CHECK-NEXT: jb
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; CHECK: movl $671088640, %e
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; CHECK-NEXT: btq %rax, %r
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; CHECK-NEXT: jae
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; CHECK: testq %rax, %r
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; CHECK-NEXT: j
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define void @test(i8* %l) nounwind {
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entry:
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%l.addr = alloca i8*, align 8 ; <i8**> [#uses=2]
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store i8* %l, i8** %l.addr
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%tmp = load i8*, i8** %l.addr ; <i8*> [#uses=1]
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%tmp1 = load i8, i8* %tmp ; <i8> [#uses=1]
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%conv = sext i8 %tmp1 to i32 ; <i32> [#uses=1]
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switch i32 %conv, label %sw.default [
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i32 62, label %sw.bb
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i32 60, label %sw.bb
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i32 38, label %sw.bb2
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i32 94, label %sw.bb2
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i32 61, label %sw.bb2
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i32 33, label %sw.bb4
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]
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sw.bb: ; preds = %entry, %entry
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call void @foo(i32 0)
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br label %sw.epilog
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sw.bb2: ; preds = %entry, %entry, %entry
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call void @foo(i32 1)
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br label %sw.epilog
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sw.bb4: ; preds = %entry
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call void @foo(i32 3)
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br label %sw.epilog
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sw.default: ; preds = %entry
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call void @foo(i32 97)
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br label %sw.epilog
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sw.epilog: ; preds = %sw.default, %sw.bb4, %sw.bb2, %sw.bb
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ret void
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}
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declare void @foo(i32)
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; Don't zero extend the test operands to pointer type if it can be avoided.
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; rdar://8781238
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define void @test2(i32 %x) nounwind ssp {
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; CHECK-LABEL: test2:
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; CHECK: cmpl $6
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; CHECK: ja
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; CHECK-NEXT: movl $91
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; CHECK-NOT: movl
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; CHECK-NEXT: btl
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; CHECK-NEXT: jae
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entry:
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switch i32 %x, label %if.end [
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i32 6, label %if.then
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i32 4, label %if.then
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i32 3, label %if.then
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i32 1, label %if.then
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i32 0, label %if.then
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]
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if.then: ; preds = %entry, %entry, %entry, %entry, %entry
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tail call void @bar() nounwind
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ret void
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if.end: ; preds = %entry
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ret void
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}
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declare void @bar()
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define void @test3(i32 %x) nounwind {
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; CHECK-LABEL: test3:
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; CHECK: cmpl $5
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; CHECK: ja
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; CHECK: cmpl $4
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; CHECK: je
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switch i32 %x, label %if.end [
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i32 0, label %if.then
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i32 1, label %if.then
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i32 2, label %if.then
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i32 3, label %if.then
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i32 5, label %if.then
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]
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if.then:
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tail call void @bar() nounwind
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ret void
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if.end:
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ret void
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}
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; Ensure that optimizing for jump tables doesn't needlessly deteriorate the
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; created binary tree search. See PR22262.
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define void @test4(i32 %x, i32* %y) {
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; CHECK-LABEL: test4:
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entry:
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switch i32 %x, label %sw.default [
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i32 10, label %sw.bb
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i32 20, label %sw.bb1
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i32 30, label %sw.bb2
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i32 40, label %sw.bb3
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i32 50, label %sw.bb4
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i32 60, label %sw.bb5
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]
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sw.bb:
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store i32 1, i32* %y
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br label %sw.epilog
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sw.bb1:
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store i32 2, i32* %y
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br label %sw.epilog
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sw.bb2:
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store i32 3, i32* %y
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br label %sw.epilog
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sw.bb3:
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store i32 4, i32* %y
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br label %sw.epilog
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sw.bb4:
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store i32 5, i32* %y
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br label %sw.epilog
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sw.bb5:
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store i32 6, i32* %y
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br label %sw.epilog
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sw.default:
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store i32 7, i32* %y
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br label %sw.epilog
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sw.epilog:
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ret void
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; The balanced binary switch here would start with a comparison against 39, but
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; it is currently starting with 29 because of the density-sum heuristic.
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; CHECK: cmpl $39
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; CHECK: jg
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; CHECK: cmpl $10
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; CHECK: je
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; CHECK: cmpl $20
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; CHECK: je
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; CHECK: cmpl $30
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; CHECK: jne
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; CHECK: cmpl $40
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; CHECK: je
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; CHECK: cmpl $50
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; CHECK: je
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; CHECK: cmpl $60
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; CHECK: jne
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}
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