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728acc9bd9
This is mostly to test the waters. I'd like to get results from FNT build bots and other bots running on non-x86 platforms. This feature has been pretty heavily tested over the last few months by me, and it fixes several of the execution time regressions caused by the inlining work by preventing inlining decisions from radically impacting block layout. I've seen very large improvements in yacr2 and ackermann benchmarks, along with the expected noise across all of the benchmark suite whenever code layout changes. I've analyzed all of the regressions and fixed them, or found them to be impossible to fix. See my email to llvmdev for more details. I'd like for this to be in 3.1 as it complements the inliner changes, but if any failures are showing up or anyone has concerns, it is just a flag flip and so can be easily turned off. I'm switching it on tonight to try and get at least one run through various folks' performance suites in case SPEC or something else has serious issues with it. I'll watch bots and revert if anything shows up. llvm-svn: 154816
102 lines
2.5 KiB
LLVM
102 lines
2.5 KiB
LLVM
; RUN: llc -march=x86-64 -asm-verbose=false < %s | 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: jae
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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** %l.addr ; <i8*> [#uses=1]
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%tmp1 = load 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: 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: 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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