llvm/test/CodeGen/X86/2012-04-26-sdglue.ll
Andrew Trick 6a7770b7ae Enable MI Sched for x86.
This changes the SelectionDAG scheduling preference to source
order. Soon, the SelectionDAG scheduler can be bypassed saving
a nice chunk of compile time.

Performance differences that result from this change are often a
consequence of register coalescing. The register coalescer is far from
perfect. Bugs can be filed for deficiencies.

On x86 SandyBridge/Haswell, the source order schedule is often
preserved, particularly for small blocks.

Register pressure is generally improved over the SD scheduler's ILP
mode. However, we are still able to handle large blocks that require
latency hiding, unlike the SD scheduler's BURR mode. MI scheduler also
attempts to discover the critical path in single-block loops and
adjust heuristics accordingly.

The MI scheduler relies on the new machine model. This is currently
unimplemented for AVX, so we may not be generating the best code yet.

Unit tests are updated so they don't depend on SD scheduling heuristics.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@192750 91177308-0d34-0410-b5e6-96231b3b80d8
2013-10-15 23:33:07 +00:00

48 lines
2.7 KiB
LLVM

; RUN: llc < %s -mtriple=x86_64-apple-darwin -mcpu=core-avx2 -mattr=+avx | FileCheck %s
; rdar://11314175: SD Scheduler, BuildSchedUnits assert:
; N->getNodeId() == -1 && "Node already inserted!
; It's hard to test for the ISEL condition because CodeGen optimizes
; away the bugpointed code. Just ensure the basics are still there.
;CHECK-LABEL: func:
;CHECK: vpxor
;CHECK: vinserti128
;CHECK: vpshufd
;CHECK: vpshufd
;CHECK: vmulps
;CHECK: vmulps
;CHECK: ret
define void @func() nounwind ssp {
%tmp = load <4 x float>* null, align 1
%tmp14 = getelementptr <4 x float>* null, i32 2
%tmp15 = load <4 x float>* %tmp14, align 1
%tmp16 = shufflevector <4 x float> %tmp, <4 x float> <float 0.000000e+00, float undef, float undef, float undef>, <8 x i32> <i32 0, i32 1, i32 2, i32 3, i32 4, i32 4, i32 4, i32 4>
%tmp17 = call <8 x float> @llvm.x86.avx.vinsertf128.ps.256(<8 x float> %tmp16, <4 x float> undef, i8 1)
%tmp18 = bitcast <4 x float> %tmp to <16 x i8>
%tmp19 = shufflevector <16 x i8> %tmp18, <16 x i8> undef, <16 x i32> <i32 4, i32 5, i32 6, i32 7, i32 8, i32 9, i32 10, i32 11, i32 12, i32 13, i32 14, i32 15, i32 16, i32 17, i32 18, i32 19>
%tmp20 = bitcast <16 x i8> %tmp19 to <4 x float>
%tmp21 = bitcast <4 x float> %tmp15 to <16 x i8>
%tmp22 = shufflevector <16 x i8> undef, <16 x i8> %tmp21, <16 x i32> <i32 4, i32 5, i32 6, i32 7, i32 8, i32 9, i32 10, i32 11, i32 12, i32 13, i32 14, i32 15, i32 16, i32 17, i32 18, i32 19>
%tmp23 = bitcast <16 x i8> %tmp22 to <4 x float>
%tmp24 = shufflevector <4 x float> %tmp20, <4 x float> <float 0.000000e+00, float undef, float undef, float undef>, <8 x i32> <i32 0, i32 1, i32 2, i32 3, i32 4, i32 4, i32 4, i32 4>
%tmp25 = call <8 x float> @llvm.x86.avx.vinsertf128.ps.256(<8 x float> %tmp24, <4 x float> %tmp23, i8 1)
%tmp26 = fmul <8 x float> %tmp17, undef
%tmp27 = fmul <8 x float> %tmp25, undef
%tmp28 = fadd <8 x float> %tmp26, %tmp27
%tmp29 = fadd <8 x float> %tmp28, undef
%tmp30 = shufflevector <8 x float> %tmp29, <8 x float> undef, <4 x i32> <i32 0, i32 1, i32 2, i32 3>
%tmp31 = fmul <4 x float> undef, %tmp30
%tmp32 = call <8 x float> @llvm.x86.avx.vinsertf128.ps.256(<8 x float> zeroinitializer, <4 x float> %tmp31, i8 1)
%tmp33 = fadd <8 x float> undef, %tmp32
%tmp34 = call <8 x float> @llvm.x86.avx.hadd.ps.256(<8 x float> %tmp33, <8 x float> undef) nounwind
%tmp35 = fsub <8 x float> %tmp34, undef
%tmp36 = call <8 x float> @llvm.x86.avx.hadd.ps.256(<8 x float> zeroinitializer, <8 x float> %tmp35) nounwind
store <8 x float> %tmp36, <8 x float>* undef, align 32
ret void
}
declare <8 x float> @llvm.x86.avx.vinsertf128.ps.256(<8 x float>, <4 x float>, i8) nounwind readnone
declare <8 x float> @llvm.x86.avx.hadd.ps.256(<8 x float>, <8 x float>) nounwind readnone