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llvm-mirror/test/CodeGen/X86/postra-licm.ll
Chandler Carruth 728acc9bd9 Flip the new block-placement pass to be on by default. 
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
2012-04-16 13:49:17 +00:00

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; RUN: llc < %s -mtriple=i386-apple-darwin -relocation-model=pic -disable-fp-elim | FileCheck %s -check-prefix=X86-32
; RUN: llc < %s -mtriple=x86_64-apple-darwin -relocation-model=pic -disable-fp-elim | FileCheck %s -check-prefix=X86-64
; MachineLICM should be able to hoist loop invariant reload out of the loop.
; Only linear scan needs this, -regalloc=greedy sinks the spill instead.
; rdar://7233099
%struct.FILE = type { i8*, i32, i32, i16, i16, %struct.__sbuf, i32, i8*, i32 (i8*)*, i32 (i8*, i8*, i32)*, i64 (i8*, i64, i32)*, i32 (i8*, i8*, i32)*, %struct.__sbuf, %struct.__sFILEX*, i32, [3 x i8], [1 x i8], %struct.__sbuf, i32, i64 }
%struct.__sFILEX = type opaque
%struct.__sbuf = type { i8*, i32 }
%struct.epoch_t = type { %struct.trans_t*, %struct.trans_t*, i32, i32, i32, i32, i32 }
%struct.trans_t = type { i32, i32, i32, i8* }
@.str12 = external constant [2 x i8], align 1 ; <[2 x i8]*> [#uses=1]
@.str19 = external constant [7 x i8], align 1 ; <[7 x i8]*> [#uses=1]
@.str24 = external constant [4 x i8], align 1 ; <[4 x i8]*> [#uses=1]
define i32 @t1(i32 %c, i8** nocapture %v) nounwind ssp {
; X86-32: t1:
entry:
br i1 undef, label %bb, label %bb3
bb: ; preds = %entry
unreachable
bb3: ; preds = %entry
br i1 undef, label %bb.i, label %bb.nph41
bb.i: ; preds = %bb3
unreachable
bb.nph41: ; preds = %bb3
%0 = call %struct.FILE* @"\01_fopen$UNIX2003"(i8* undef, i8* getelementptr inbounds ([2 x i8]* @.str12, i32 0, i32 0)) nounwind ; <%struct.FILE*> [#uses=3]
br i1 undef, label %bb4, label %bb5.preheader
bb5.preheader: ; preds = %bb.nph41
br label %bb5
bb4: ; preds = %bb.nph41
unreachable
bb5: ; preds = %bb5, %bb5.preheader
br i1 undef, label %bb7, label %bb5
bb7: ; preds = %bb5
br i1 undef, label %bb9, label %bb12
bb9: ; preds = %bb7
unreachable
bb12: ; preds = %bb7
br i1 undef, label %bb16, label %bb22
bb16: ; preds = %bb12
unreachable
bb22: ; preds = %bb12
br label %bb.i1
bb.i1: ; preds = %bb.i1, %bb22
%1 = icmp eq i8 undef, 69 ; <i1> [#uses=1]
br i1 %1, label %imix_test.exit, label %bb.i1
imix_test.exit: ; preds = %bb.i1
br i1 undef, label %bb23, label %bb26.preheader
bb26.preheader: ; preds = %imix_test.exit
br i1 undef, label %bb28, label %bb30
bb23: ; preds = %imix_test.exit
unreachable
; Verify that there are no loads inside the loop.
; X86-32: .align 4
; X86-32: %bb28
; X86-32-NOT: (%esp),
; X86-32-NOT: (%ebp),
; X86-32: jmp
bb28: ; preds = %bb28, %bb26.preheader
%counter.035 = phi i32 [ %3, %bb28 ], [ 0, %bb26.preheader ] ; <i32> [#uses=2]
%tmp56 = shl i32 %counter.035, 2 ; <i32> [#uses=0]
%2 = call i8* @fgets(i8* undef, i32 50, %struct.FILE* %0) nounwind ; <i8*> [#uses=0]
%3 = add nsw i32 %counter.035, 1 ; <i32> [#uses=1]
%4 = call i32 @feof(%struct.FILE* %0) nounwind ; <i32> [#uses=0]
br label %bb28
bb30: ; preds = %bb26.preheader
%5 = call i32 @strcmp(i8* undef, i8* getelementptr inbounds ([7 x i8]* @.str19, i32 0, i32 0)) nounwind readonly ; <i32> [#uses=0]
br i1 undef, label %bb34, label %bb70
bb32.loopexit: ; preds = %bb45
%6 = icmp eq i32 undef, 0 ; <i1> [#uses=1]
%indvar.next55 = add i32 %indvar54, 1 ; <i32> [#uses=1]
br i1 %6, label %bb34, label %bb70
bb34: ; preds = %bb32.loopexit, %bb30
%indvar54 = phi i32 [ %indvar.next55, %bb32.loopexit ], [ 0, %bb30 ] ; <i32> [#uses=3]
br i1 false, label %bb35, label %bb39.preheader
bb35: ; preds = %bb34
unreachable
bb39.preheader: ; preds = %bb34
%7 = getelementptr inbounds %struct.epoch_t* undef, i32 %indvar54, i32 3 ; <i32*> [#uses=1]
%8 = getelementptr inbounds %struct.epoch_t* undef, i32 %indvar54, i32 2 ; <i32*> [#uses=0]
br i1 false, label %bb42, label %bb45
bb42: ; preds = %bb39.preheader
unreachable
bb45: ; preds = %bb39.preheader
%9 = call i32 @strcmp(i8* undef, i8* getelementptr inbounds ([4 x i8]* @.str24, i32 0, i32 0)) nounwind readonly ; <i32> [#uses=0]
br i1 false, label %bb47, label %bb32.loopexit
bb47: ; preds = %bb45
%10 = load i32* %7, align 4 ; <i32> [#uses=0]
unreachable
bb70: ; preds = %bb32.loopexit, %bb30
br i1 undef, label %bb78, label %bb76
bb76: ; preds = %bb70
unreachable
bb78: ; preds = %bb70
br i1 undef, label %bb83, label %bb79
bb79: ; preds = %bb78
unreachable
bb83: ; preds = %bb78
call void @rewind(%struct.FILE* %0) nounwind
unreachable
}
declare %struct.FILE* @"\01_fopen$UNIX2003"(i8*, i8*)
declare i8* @fgets(i8*, i32, %struct.FILE* nocapture) nounwind
declare void @rewind(%struct.FILE* nocapture) nounwind
declare i32 @feof(%struct.FILE* nocapture) nounwind
declare i32 @strcmp(i8* nocapture, i8* nocapture) nounwind readonly
@map_4_to_16 = external constant [16 x i16], align 32 ; <[16 x i16]*> [#uses=2]
define void @t2(i8* nocapture %bufp, i8* nocapture %data, i32 %dsize) nounwind ssp {
; X86-64: t2:
entry:
br i1 undef, label %return, label %bb.nph
bb.nph: ; preds = %entry
; X86-64: movq _map_4_to_16@GOTPCREL(%rip)
; X86-64: .align 4
%tmp5 = zext i32 undef to i64 ; <i64> [#uses=1]
%tmp6 = add i64 %tmp5, 1 ; <i64> [#uses=1]
%tmp11 = shl i64 undef, 1 ; <i64> [#uses=1]
%tmp14 = mul i64 undef, 3 ; <i64> [#uses=1]
br label %bb
bb: ; preds = %bb, %bb.nph
%tmp9 = mul i64 undef, undef ; <i64> [#uses=2]
%tmp12 = add i64 %tmp11, %tmp9 ; <i64> [#uses=1]
%scevgep13 = getelementptr i8* %bufp, i64 %tmp12 ; <i8*> [#uses=1]
%tmp15 = add i64 %tmp14, %tmp9 ; <i64> [#uses=1]
%scevgep16 = getelementptr i8* %bufp, i64 %tmp15 ; <i8*> [#uses=1]
%0 = load i8* undef, align 1 ; <i8> [#uses=1]
%1 = zext i8 %0 to i32 ; <i32> [#uses=1]
%2 = getelementptr inbounds [16 x i16]* @map_4_to_16, i64 0, i64 0 ; <i16*> [#uses=1]
%3 = load i16* %2, align 2 ; <i16> [#uses=1]
%4 = trunc i16 %3 to i8 ; <i8> [#uses=1]
store i8 %4, i8* undef, align 1
%5 = and i32 %1, 15 ; <i32> [#uses=1]
%6 = zext i32 %5 to i64 ; <i64> [#uses=1]
%7 = getelementptr inbounds [16 x i16]* @map_4_to_16, i64 0, i64 %6 ; <i16*> [#uses=1]
%8 = load i16* %7, align 2 ; <i16> [#uses=2]
%9 = lshr i16 %8, 8 ; <i16> [#uses=1]
%10 = trunc i16 %9 to i8 ; <i8> [#uses=1]
store i8 %10, i8* %scevgep13, align 1
%11 = trunc i16 %8 to i8 ; <i8> [#uses=1]
store i8 %11, i8* %scevgep16, align 1
%exitcond = icmp eq i64 undef, %tmp6 ; <i1> [#uses=1]
br i1 %exitcond, label %return, label %bb
return: ; preds = %bb, %entry
ret void
}
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