50b9ca4dda
After https://github.com/llvm/llvm-project/pull/153643, there may be a BranchOnCond with constant condition in the entry block. Simplify those in removeBranchOnConst. This removes a number of redundant conditional branch from entry blocks. In some cases, it may also make the original scalar loop unreachable, because we know it will never execute. In that case, we need to remove the loop from LoopInfo, because all unreachable blocks may dominate each other, making LoopInfo invalid. In those cases, we can also completely remove the loop, for which I'll share a follow-up patch. Depends on https://github.com/llvm/llvm-project/pull/153643. PR: https://github.com/llvm/llvm-project/pull/154510
97 lines
5.7 KiB
LLVM
97 lines
5.7 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 4
|
|
; RUN: opt -passes=loop-vectorize -mtriple=riscv64 -mattr=+v -S %s | FileCheck %s
|
|
|
|
define void @test(ptr %p, i64 %a, i8 %b) {
|
|
; CHECK-LABEL: define void @test(
|
|
; CHECK-SAME: ptr [[P:%.*]], i64 [[A:%.*]], i8 [[B:%.*]]) #[[ATTR0:[0-9]+]] {
|
|
; CHECK-NEXT: entry:
|
|
; CHECK-NEXT: br label [[VECTOR_PH:%.*]]
|
|
; CHECK: vector.ph:
|
|
; CHECK-NEXT: [[BROADCAST_SPLATINSERT:%.*]] = insertelement <vscale x 2 x i8> poison, i8 [[B]], i64 0
|
|
; CHECK-NEXT: [[BROADCAST_SPLAT:%.*]] = shufflevector <vscale x 2 x i8> [[BROADCAST_SPLATINSERT]], <vscale x 2 x i8> poison, <vscale x 2 x i32> zeroinitializer
|
|
; CHECK-NEXT: [[BROADCAST_SPLATINSERT1:%.*]] = insertelement <vscale x 2 x i64> poison, i64 [[A]], i64 0
|
|
; CHECK-NEXT: [[BROADCAST_SPLAT2:%.*]] = shufflevector <vscale x 2 x i64> [[BROADCAST_SPLATINSERT1]], <vscale x 2 x i64> poison, <vscale x 2 x i32> zeroinitializer
|
|
; CHECK-NEXT: [[TMP5:%.*]] = shl <vscale x 2 x i64> [[BROADCAST_SPLAT2]], splat (i64 48)
|
|
; CHECK-NEXT: [[TMP6:%.*]] = ashr <vscale x 2 x i64> [[TMP5]], splat (i64 52)
|
|
; CHECK-NEXT: [[TMP7:%.*]] = trunc <vscale x 2 x i64> [[TMP6]] to <vscale x 2 x i32>
|
|
; CHECK-NEXT: [[TMP8:%.*]] = zext <vscale x 2 x i8> [[BROADCAST_SPLAT]] to <vscale x 2 x i32>
|
|
; CHECK-NEXT: [[BROADCAST_SPLATINSERT3:%.*]] = insertelement <vscale x 2 x ptr> poison, ptr [[P]], i64 0
|
|
; CHECK-NEXT: [[BROADCAST_SPLAT4:%.*]] = shufflevector <vscale x 2 x ptr> [[BROADCAST_SPLATINSERT3]], <vscale x 2 x ptr> poison, <vscale x 2 x i32> zeroinitializer
|
|
; CHECK-NEXT: [[TMP9:%.*]] = call <vscale x 2 x i32> @llvm.stepvector.nxv2i32()
|
|
; CHECK-NEXT: [[TMP10:%.*]] = mul <vscale x 2 x i32> [[TMP9]], splat (i32 1)
|
|
; CHECK-NEXT: [[INDUCTION:%.*]] = add <vscale x 2 x i32> zeroinitializer, [[TMP10]]
|
|
; CHECK-NEXT: br label [[FOR_COND:%.*]]
|
|
; CHECK: vector.body:
|
|
; CHECK-NEXT: [[VEC_IND:%.*]] = phi <vscale x 2 x i32> [ [[INDUCTION]], [[VECTOR_PH]] ], [ [[VEC_IND_NEXT:%.*]], [[FOR_COND]] ]
|
|
; CHECK-NEXT: [[AVL:%.*]] = phi i32 [ 9, [[VECTOR_PH]] ], [ [[AVL_NEXT:%.*]], [[FOR_COND]] ]
|
|
; CHECK-NEXT: [[TMP11:%.*]] = call i32 @llvm.experimental.get.vector.length.i32(i32 [[AVL]], i32 2, i1 true)
|
|
; CHECK-NEXT: [[BROADCAST_SPLATINSERT7:%.*]] = insertelement <vscale x 2 x i32> poison, i32 [[TMP11]], i64 0
|
|
; CHECK-NEXT: [[BROADCAST_SPLAT8:%.*]] = shufflevector <vscale x 2 x i32> [[BROADCAST_SPLATINSERT7]], <vscale x 2 x i32> poison, <vscale x 2 x i32> zeroinitializer
|
|
; CHECK-NEXT: [[TMP12:%.*]] = icmp slt <vscale x 2 x i32> [[VEC_IND]], splat (i32 2)
|
|
; CHECK-NEXT: [[PREDPHI:%.*]] = select <vscale x 2 x i1> [[TMP12]], <vscale x 2 x i32> [[TMP8]], <vscale x 2 x i32> [[TMP7]]
|
|
; CHECK-NEXT: [[TMP16:%.*]] = shl <vscale x 2 x i32> [[PREDPHI]], splat (i32 8)
|
|
; CHECK-NEXT: [[TMP17:%.*]] = trunc <vscale x 2 x i32> [[TMP16]] to <vscale x 2 x i8>
|
|
; CHECK-NEXT: call void @llvm.vp.scatter.nxv2i8.nxv2p0(<vscale x 2 x i8> [[TMP17]], <vscale x 2 x ptr> align 1 [[BROADCAST_SPLAT4]], <vscale x 2 x i1> splat (i1 true), i32 [[TMP11]])
|
|
; CHECK-NEXT: [[AVL_NEXT]] = sub nuw i32 [[AVL]], [[TMP11]]
|
|
; CHECK-NEXT: [[VEC_IND_NEXT]] = add <vscale x 2 x i32> [[VEC_IND]], [[BROADCAST_SPLAT8]]
|
|
; CHECK-NEXT: [[TMP21:%.*]] = icmp eq i32 [[AVL_NEXT]], 0
|
|
; CHECK-NEXT: br i1 [[TMP21]], label [[MIDDLE_BLOCK:%.*]], label [[FOR_COND]], !llvm.loop [[LOOP0:![0-9]+]]
|
|
; CHECK: middle.block:
|
|
; CHECK-NEXT: br label [[EXIT1:%.*]]
|
|
; CHECK: scalar.ph:
|
|
; CHECK-NEXT: br label [[FOR_COND1:%.*]]
|
|
; CHECK: for.cond:
|
|
; CHECK-NEXT: [[IV:%.*]] = phi i32 [ 0, [[SCALAR_PH1:%.*]] ], [ [[ADD:%.*]], [[FOR_BODY:%.*]] ]
|
|
; CHECK-NEXT: [[ADD]] = add i32 [[IV]], 1
|
|
; CHECK-NEXT: [[CMP_SLT:%.*]] = icmp slt i32 [[IV]], 2
|
|
; CHECK-NEXT: [[SHL:%.*]] = shl i64 [[A]], 48
|
|
; CHECK-NEXT: [[ASHR:%.*]] = ashr i64 [[SHL]], 52
|
|
; CHECK-NEXT: [[TRUNC_I32:%.*]] = trunc i64 [[ASHR]] to i32
|
|
; CHECK-NEXT: br i1 [[CMP_SLT]], label [[COND_FALSE:%.*]], label [[FOR_BODY]]
|
|
; CHECK: cond.false:
|
|
; CHECK-NEXT: [[ZEXT:%.*]] = zext i8 [[B]] to i32
|
|
; CHECK-NEXT: br label [[FOR_BODY]]
|
|
; CHECK: for.body:
|
|
; CHECK-NEXT: [[COND:%.*]] = phi i32 [ [[TRUNC_I32]], [[FOR_COND1]] ], [ [[ZEXT]], [[COND_FALSE]] ]
|
|
; CHECK-NEXT: [[SHL_I32:%.*]] = shl i32 [[COND]], 8
|
|
; CHECK-NEXT: [[TRUNC:%.*]] = trunc i32 [[SHL_I32]] to i8
|
|
; CHECK-NEXT: store i8 [[TRUNC]], ptr [[P]], align 1
|
|
; CHECK-NEXT: [[CMP:%.*]] = icmp slt i32 [[IV]], 8
|
|
; CHECK-NEXT: br i1 [[CMP]], label [[FOR_COND1]], label [[EXIT1]]
|
|
; CHECK: exit:
|
|
; CHECK-NEXT: ret void
|
|
;
|
|
entry:
|
|
br label %for.cond
|
|
|
|
for.cond: ; preds = %for.body, %entry
|
|
%iv = phi i32 [ 0, %entry ], [ %add, %for.body ]
|
|
%add = add i32 %iv, 1
|
|
%cmp.slt = icmp slt i32 %iv, 2
|
|
%shl = shl i64 %a, 48
|
|
%ashr = ashr i64 %shl, 52
|
|
%trunc.i32 = trunc i64 %ashr to i32
|
|
br i1 %cmp.slt, label %cond.false, label %for.body
|
|
|
|
cond.false: ; preds = %for.cond
|
|
%zext = zext i8 %b to i32
|
|
br label %for.body
|
|
|
|
for.body: ; preds = %cond.false, %for.cond
|
|
%cond = phi i32 [ %trunc.i32, %for.cond ], [ %zext, %cond.false ]
|
|
%shl.i32 = shl i32 %cond, 8
|
|
%trunc = trunc i32 %shl.i32 to i8
|
|
store i8 %trunc, ptr %p, align 1
|
|
%cmp = icmp slt i32 %iv, 8
|
|
br i1 %cmp, label %for.cond, label %exit
|
|
|
|
exit: ; preds = %for.body
|
|
ret void
|
|
}
|
|
;.
|
|
; CHECK: [[LOOP0]] = distinct !{[[LOOP0]], [[META1:![0-9]+]], [[META2:![0-9]+]], [[META3:![0-9]+]]}
|
|
; CHECK: [[META1]] = !{!"llvm.loop.isvectorized", i32 1}
|
|
; CHECK: [[META2]] = !{!"llvm.loop.isvectorized.tailfoldingstyle", !"evl"}
|
|
; CHECK: [[META3]] = !{!"llvm.loop.unroll.runtime.disable"}
|
|
;.
|