; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 5
; RUN: llc -mtriple=riscv64 -mattr=+v < %s | FileCheck %s
; Testing VFIRST patterns related to llvm/test/Transforms/LoopIdiom/RISCV/byte-compare-index.ll
define i32 @compare_bytes_simple(ptr %a, ptr %b, i32 signext %len, i32 signext %n) {
; CHECK-LABEL: compare_bytes_simple:
; CHECK: # %bb.0: # %entry
; CHECK-NEXT: addiw a4, a2, 1
; CHECK-NEXT: bltu a3, a4, .LBB0_7
; CHECK-NEXT: # %bb.1: # %mismatch_mem_check
; CHECK-NEXT: slli a2, a4, 32
; CHECK-NEXT: srli a2, a2, 32
; CHECK-NEXT: slli a5, a3, 32
; CHECK-NEXT: srli a5, a5, 32
; CHECK-NEXT: add a6, a0, a2
; CHECK-NEXT: add a7, a0, a5
; CHECK-NEXT: srli a6, a6, 12
; CHECK-NEXT: srli a7, a7, 12
; CHECK-NEXT: bne a6, a7, .LBB0_7
; CHECK-NEXT: # %bb.2: # %mismatch_mem_check
; CHECK-NEXT: add a6, a1, a2
; CHECK-NEXT: add a7, a1, a5
; CHECK-NEXT: srli a6, a6, 12
; CHECK-NEXT: srli a7, a7, 12
; CHECK-NEXT: bne a6, a7, .LBB0_7
; CHECK-NEXT: .LBB0_3: # %mismatch_vec_loop
; CHECK-NEXT: # =>This Inner Loop Header: Depth=1
; CHECK-NEXT: sub a4, a5, a2
; CHECK-NEXT: vsetvli a4, a4, e8, m2, ta, ma
; CHECK-NEXT: add a6, a0, a2
; CHECK-NEXT: vle8.v v8, (a6)
; CHECK-NEXT: add a6, a1, a2
; CHECK-NEXT: vle8.v v10, (a6)
; CHECK-NEXT: vmsne.vv v12, v8, v10
; CHECK-NEXT: vfirst.m a7, v12
; CHECK-NEXT: mv a6, a4
; CHECK-NEXT: bltz a7, .LBB0_5
; CHECK-NEXT: # %bb.4: # %mismatch_vec_loop
; CHECK-NEXT: # in Loop: Header=BB0_3 Depth=1
; CHECK-NEXT: mv a6, a7
; CHECK-NEXT: .LBB0_5: # %mismatch_vec_loop
; CHECK-NEXT: # in Loop: Header=BB0_3 Depth=1
; CHECK-NEXT: sext.w a7, a6
; CHECK-NEXT: bne a7, a4, .LBB0_11
; CHECK-NEXT: # %bb.6: # %mismatch_vec_loop_inc
; CHECK-NEXT: # in Loop: Header=BB0_3 Depth=1
; CHECK-NEXT: add a2, a2, a4
; CHECK-NEXT: bne a2, a5, .LBB0_3
; CHECK-NEXT: j .LBB0_9
; CHECK-NEXT: .LBB0_7: # %mismatch_loop
; CHECK-NEXT: # =>This Inner Loop Header: Depth=1
; CHECK-NEXT: slli a2, a4, 32
; CHECK-NEXT: srli a2, a2, 32
; CHECK-NEXT: add a5, a0, a2
; CHECK-NEXT: lbu a5, 0(a5)
; CHECK-NEXT: add a2, a1, a2
; CHECK-NEXT: lbu a2, 0(a2)
; CHECK-NEXT: bne a5, a2, .LBB0_10
; CHECK-NEXT: # %bb.8: # %mismatch_loop_inc
; CHECK-NEXT: # in Loop: Header=BB0_7 Depth=1
; CHECK-NEXT: addiw a4, a4, 1
; CHECK-NEXT: bne a3, a4, .LBB0_7
; CHECK-NEXT: .LBB0_9: # %while.end
; CHECK-NEXT: mv a0, a3
; CHECK-NEXT: ret
; CHECK-NEXT: .LBB0_10:
; CHECK-NEXT: mv a0, a4
; CHECK-NEXT: ret
; CHECK-NEXT: .LBB0_11: # %mismatch_vec_loop_found
; CHECK-NEXT: slli a6, a6, 32
; CHECK-NEXT: srli a3, a6, 32
; CHECK-NEXT: add a0, a2, a3
; CHECK-NEXT: ret
entry:
%0 = add i32 %len, 1
br label %mismatch_min_it_check
mismatch_min_it_check: ; preds = %entry
%1 = zext i32 %0 to i64
%2 = zext i32 %n to i64
%3 = icmp ule i32 %0, %n
br i1 %3, label %mismatch_mem_check, label %mismatch_loop_pre
mismatch_mem_check: ; preds = %mismatch_min_it_check
%4 = getelementptr i8, ptr %a, i64 %1
%5 = getelementptr i8, ptr %b, i64 %1
%6 = ptrtoint ptr %5 to i64
%7 = ptrtoint ptr %4 to i64
%8 = getelementptr i8, ptr %a, i64 %2
%9 = getelementptr i8, ptr %b, i64 %2
%10 = ptrtoint ptr %8 to i64
%11 = ptrtoint ptr %9 to i64
%12 = lshr i64 %7, 12
%13 = lshr i64 %10, 12
%14 = lshr i64 %6, 12
%15 = lshr i64 %11, 12
%16 = icmp ne i64 %12, %13
%17 = icmp ne i64 %14, %15
%18 = or i1 %16, %17
br i1 %18, label %mismatch_loop_pre, label %mismatch_vec_loop_preheader
mismatch_vec_loop_preheader: ; preds = %mismatch_mem_check
br label %mismatch_vec_loop
mismatch_vec_loop: ; preds = %mismatch_vec_loop_inc, %mismatch_vec_loop_preheader
%mismatch_vector_index = phi i64 [ %1, %mismatch_vec_loop_preheader ], [ %25, %mismatch_vec_loop_inc ]
%avl = sub nuw nsw i64 %2, %mismatch_vector_index
%19 = call i32 @llvm.experimental.get.vector.length.i64(i64 %avl, i32 16, i1 true)
%20 = getelementptr inbounds i8, ptr %a, i64 %mismatch_vector_index
%lhs.load = call <vscale x 16 x i8> @llvm.vp.load.nxv16i8.p0(ptr %20, <vscale x 16 x i1> shufflevector (<vscale x 16 x i1> insertelement (<vscale x 16 x i1> poison, i1 true, i64 0), <vscale x 16 x i1> poison, <vscale x 16 x i32> zeroinitializer), i32 %19)
%21 = getelementptr inbounds i8, ptr %b, i64 %mismatch_vector_index
%rhs.load = call <vscale x 16 x i8> @llvm.vp.load.nxv16i8.p0(ptr %21, <vscale x 16 x i1> shufflevector (<vscale x 16 x i1> insertelement (<vscale x 16 x i1> poison, i1 true, i64 0), <vscale x 16 x i1> poison, <vscale x 16 x i32> zeroinitializer), i32 %19)
%mismatch.cmp = call <vscale x 16 x i1> @llvm.vp.icmp.nxv16i8(<vscale x 16 x i8> %lhs.load, <vscale x 16 x i8> %rhs.load, metadata !"ne", <vscale x 16 x i1> shufflevector (<vscale x 16 x i1> insertelement (<vscale x 16 x i1> poison, i1 true, i64 0), <vscale x 16 x i1> poison, <vscale x 16 x i32> zeroinitializer), i32 %19)
%22 = call i32 @llvm.vp.cttz.elts.i32.nxv16i1(<vscale x 16 x i1> %mismatch.cmp, i1 false, <vscale x 16 x i1> shufflevector (<vscale x 16 x i1> insertelement (<vscale x 16 x i1> poison, i1 true, i64 0), <vscale x 16 x i1> poison, <vscale x 16 x i32> zeroinitializer), i32 %19)
%23 = icmp ne i32 %22, %19
br i1 %23, label %mismatch_vec_loop_found, label %mismatch_vec_loop_inc
mismatch_vec_loop_inc: ; preds = %mismatch_vec_loop
%24 = zext i32 %19 to i64
%25 = add nuw nsw i64 %mismatch_vector_index, %24
%26 = icmp ne i64 %25, %2
br i1 %26, label %mismatch_vec_loop, label %mismatch_end
mismatch_vec_loop_found: ; preds = %mismatch_vec_loop
%ctz = phi i32 [ %22, %mismatch_vec_loop ]
%mismatch_vector_index1 = phi i64 [ %mismatch_vector_index, %mismatch_vec_loop ]
%27 = zext i32 %ctz to i64
%28 = add nuw nsw i64 %mismatch_vector_index1, %27
%29 = trunc i64 %28 to i32
br label %mismatch_end
mismatch_loop_pre: ; preds = %mismatch_mem_check, %mismatch_min_it_check
br label %mismatch_loop
mismatch_loop: ; preds = %mismatch_loop_inc, %mismatch_loop_pre
%mismatch_index = phi i32 [ %0, %mismatch_loop_pre ], [ %36, %mismatch_loop_inc ]
%30 = zext i32 %mismatch_index to i64
%31 = getelementptr inbounds i8, ptr %a, i64 %30
%32 = load i8, ptr %31, align 1
%33 = getelementptr inbounds i8, ptr %b, i64 %30
%34 = load i8, ptr %33, align 1
%35 = icmp eq i8 %32, %34
br i1 %35, label %mismatch_loop_inc, label %mismatch_end
mismatch_loop_inc: ; preds = %mismatch_loop
%36 = add i32 %mismatch_index, 1
%37 = icmp eq i32 %36, %n
br i1 %37, label %mismatch_end, label %mismatch_loop
mismatch_end: ; preds = %mismatch_loop_inc, %mismatch_loop, %mismatch_vec_loop_found, %mismatch_vec_loop_inc
%mismatch_result = phi i32 [ %n, %mismatch_loop_inc ], [ %mismatch_index, %mismatch_loop ], [ %n, %mismatch_vec_loop_inc ], [ %29, %mismatch_vec_loop_found ]
br i1 true, label %byte.compare, label %while.cond
while.cond: ; preds = %mismatch_end, %while.body
%len.addr = phi i32 [ %len, %mismatch_end ], [ %mismatch_result, %while.body ]
%inc = add i32 %len.addr, 1
%cmp.not = icmp eq i32 %mismatch_result, %n
br i1 %cmp.not, label %while.end, label %while.body
while.body: ; preds = %while.cond
%idxprom = zext i32 %mismatch_result to i64
%arrayidx = getelementptr inbounds i8, ptr %a, i64 %idxprom
%38 = load i8, ptr %arrayidx, align 1
%arrayidx2 = getelementptr inbounds i8, ptr %b, i64 %idxprom
%39 = load i8, ptr %arrayidx2, align 1
%cmp.not2 = icmp eq i8 %38, %39
br i1 %cmp.not2, label %while.cond, label %while.end
byte.compare: ; preds = %mismatch_end
br label %while.end
while.end: ; preds = %byte.compare, %while.body, %while.cond
%inc.lcssa = phi i32 [ %mismatch_result, %while.body ], [ %mismatch_result, %while.cond ], [ %mismatch_result, %byte.compare ]
ret i32 %inc.lcssa
}
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