forked from OSchip/llvm-project
[LV][ARM] Add tail-folding tests for MVE. NFC.
D77635 added support to recognise primary induction variables for counting-down loops. This allows us to fold the scalar tail loop into the main vector body, which we need for MVE tail-predication. This adds some ARM tail-folding test cases that we want to support. This test was extracted from D76838, which implemented a different approach to reverse and thus find a primary induction variable.
This commit is contained in:
Sjoerd Meijer
parent
f6ea026f17
commit
9633fc14ae
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@ -1,19 +1,264 @@
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; RUN: opt < %s -loop-vectorize -S | FileCheck %s
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; RUN: opt < %s -loop-vectorize -prefer-predicate-over-epilog -S | FileCheck %s
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; RUN: opt < %s -loop-vectorize -disable-mve-tail-predication=false -S | FileCheck %s
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; Check that when we can't predicate this loop that it is still vectorised (with
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; an epilogue).
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; TODO: the reason this can't be predicated is because a primary induction
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; variable can't be found (not yet) for this counting down loop. But with that
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; fixed, this should be able to be predicated.
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; CHECK-LABEL: vector.body:
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; RUN: opt < %s -loop-vectorize -S | FileCheck %s --check-prefixes=COMMON,DEFAULT
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; RUN: opt < %s -loop-vectorize -prefer-predicate-over-epilog -S | FileCheck %s --check-prefixes=COMMON,CHECK-TF,CHECK-PREFER
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; RUN: opt < %s -loop-vectorize -disable-mve-tail-predication=false -S | FileCheck %s --check-prefixes=COMMON,CHECK-TF,CHECK-ENABLE-TP
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target datalayout = "e-m:e-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64"
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target triple = "thumbv8.1m.main-arm-unknown-eabihf"
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define dso_local void @foo(i8* noalias nocapture readonly %A, i8* noalias nocapture readonly %B, i8* noalias nocapture %C, i32 %N) #0 {
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; This IR corresponds to this type of C-code:
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;
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; void f(char *a, char *b, char *c, int N) {
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; while (N-- > 0)
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; *c++ = *a++ + *b++;
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; }
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;
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define dso_local void @sgt_loopguard(i8* noalias nocapture readonly %a, i8* noalias nocapture readonly %b, i8* noalias nocapture %c, i32 %N) local_unnamed_addr #0 {
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; COMMON-LABEL: @sgt_loopguard(
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; DEFAULT: vector.body:
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; CHECK-TF: masked.load
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; CHECK-TF: masked.load
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; CHECK-TF: masked.store
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entry:
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%cmp5 = icmp sgt i32 %N, 0
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br i1 %cmp5, label %while.body.preheader, label %while.end
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while.body.preheader:
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br label %while.body
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while.body:
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%N.addr.09 = phi i32 [ %dec, %while.body ], [ %N, %while.body.preheader ]
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%c.addr.08 = phi i8* [ %incdec.ptr4, %while.body ], [ %c, %while.body.preheader ]
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%b.addr.07 = phi i8* [ %incdec.ptr1, %while.body ], [ %b, %while.body.preheader ]
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%a.addr.06 = phi i8* [ %incdec.ptr, %while.body ], [ %a, %while.body.preheader ]
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%dec = add nsw i32 %N.addr.09, -1
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%incdec.ptr = getelementptr inbounds i8, i8* %a.addr.06, i32 1
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%0 = load i8, i8* %a.addr.06, align 1
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%incdec.ptr1 = getelementptr inbounds i8, i8* %b.addr.07, i32 1
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%1 = load i8, i8* %b.addr.07, align 1
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%add = add i8 %1, %0
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%incdec.ptr4 = getelementptr inbounds i8, i8* %c.addr.08, i32 1
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store i8 %add, i8* %c.addr.08, align 1
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%cmp = icmp sgt i32 %N.addr.09, 1
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br i1 %cmp, label %while.body, label %while.end.loopexit
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while.end.loopexit:
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br label %while.end
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while.end:
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ret void
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}
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; No loop-guard: we need one for this to be valid.
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;
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define dso_local void @sgt_no_loopguard(i8* noalias nocapture readonly %a, i8* noalias nocapture readonly %b, i8* noalias nocapture %c, i32 %N) local_unnamed_addr #0 {
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; COMMON-LABEL: @sgt_no_loopguard(
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; DEFAULT: vector.body:
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;
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; FIXME: I think this is currently miscompiled after D77635
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;
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; CHECK-TF: masked.load
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; CHECK-TF: masked.load
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; CHECK-TF: masked.store
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entry:
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br label %while.body
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while.body:
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%N.addr.09 = phi i32 [ %dec, %while.body ], [ %N, %entry ]
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%c.addr.08 = phi i8* [ %incdec.ptr4, %while.body ], [ %c, %entry ]
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%b.addr.07 = phi i8* [ %incdec.ptr1, %while.body ], [ %b, %entry ]
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%a.addr.06 = phi i8* [ %incdec.ptr, %while.body ], [ %a, %entry ]
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%dec = add nsw i32 %N.addr.09, -1
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%incdec.ptr = getelementptr inbounds i8, i8* %a.addr.06, i32 1
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%0 = load i8, i8* %a.addr.06, align 1
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%incdec.ptr1 = getelementptr inbounds i8, i8* %b.addr.07, i32 1
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%1 = load i8, i8* %b.addr.07, align 1
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%add = add i8 %1, %0
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%incdec.ptr4 = getelementptr inbounds i8, i8* %c.addr.08, i32 1
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store i8 %add, i8* %c.addr.08, align 1
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%cmp = icmp sgt i32 %N.addr.09, 1
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br i1 %cmp, label %while.body, label %while.end.loopexit
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while.end.loopexit:
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br label %while.end
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while.end:
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ret void
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}
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define dso_local void @sgt_extra_use_cmp(i8* noalias nocapture readonly %a, i8* noalias nocapture readonly %b, i8* noalias nocapture %c, i32 %N) local_unnamed_addr #0 {
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; COMMON-LABEL: @sgt_extra_use_cmp(
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; DEFAULT: vector.body:
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; CHECK-TF: masked.load
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; CHECK-TF: masked.load
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; CHECK-TF: masked.store
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entry:
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br label %while.body
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while.body:
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%N.addr.09 = phi i32 [ %dec, %while.body ], [ %N, %entry ]
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%c.addr.08 = phi i8* [ %incdec.ptr4, %while.body ], [ %c, %entry ]
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%b.addr.07 = phi i8* [ %incdec.ptr1, %while.body ], [ %b, %entry ]
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%a.addr.06 = phi i8* [ %incdec.ptr, %while.body ], [ %a, %entry ]
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%dec = add nsw i32 %N.addr.09, -1
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%incdec.ptr = getelementptr inbounds i8, i8* %a.addr.06, i32 1
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%0 = load i8, i8* %a.addr.06, align 1
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%incdec.ptr1 = getelementptr inbounds i8, i8* %b.addr.07, i32 1
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%1 = load i8, i8* %b.addr.07, align 1
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%add = add i8 %1, %0
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%incdec.ptr4 = getelementptr inbounds i8, i8* %c.addr.08, i32 1
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store i8 %add, i8* %c.addr.08, align 1
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%cmp = icmp sgt i32 %N.addr.09, 1
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%select = select i1 %cmp, i8 %0, i8 %1
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br i1 %cmp, label %while.body, label %while.end.loopexit
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while.end.loopexit:
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br label %while.end
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while.end:
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ret void
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}
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define dso_local void @sgt_const_tripcount(i8* noalias nocapture readonly %a, i8* noalias nocapture readonly %b, i8* noalias nocapture %c, i32 %N) local_unnamed_addr #0 {
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; COMMON-LABEL: @sgt_const_tripcount(
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; COMMON: vector.body:
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;
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; FIXME: we expect tail-folding here, but is currently not happening:
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;
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; CHECK-TF-NOT: masked.load
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; CHECK-TF-NOT: masked.load
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; CHECK-TF-NOT: masked.store
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entry:
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%cmp5 = icmp sgt i32 %N, 0
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br i1 %cmp5, label %while.body.preheader, label %while.end
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while.body.preheader:
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br label %while.body
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while.body:
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%N.addr.09 = phi i32 [ %dec, %while.body ], [ 2048, %while.body.preheader ]
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%c.addr.08 = phi i8* [ %incdec.ptr4, %while.body ], [ %c, %while.body.preheader ]
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%b.addr.07 = phi i8* [ %incdec.ptr1, %while.body ], [ %b, %while.body.preheader ]
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%a.addr.06 = phi i8* [ %incdec.ptr, %while.body ], [ %a, %while.body.preheader ]
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%dec = add nsw i32 %N.addr.09, -1
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%incdec.ptr = getelementptr inbounds i8, i8* %a.addr.06, i32 1
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%0 = load i8, i8* %a.addr.06, align 1
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%incdec.ptr1 = getelementptr inbounds i8, i8* %b.addr.07, i32 1
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%1 = load i8, i8* %b.addr.07, align 1
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%add = add i8 %1, %0
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%incdec.ptr4 = getelementptr inbounds i8, i8* %c.addr.08, i32 1
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store i8 %add, i8* %c.addr.08, align 1
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%cmp = icmp sgt i32 %N.addr.09, 1
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br i1 %cmp, label %while.body, label %while.end.loopexit
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while.end.loopexit:
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br label %while.end
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while.end:
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ret void
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}
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define dso_local void @sgt_no_guard_0_startval(i8* noalias nocapture readonly %a, i8* noalias nocapture readonly %b, i8* noalias nocapture %c, i32 %N) local_unnamed_addr #0 {
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; COMMON-LABEL: @sgt_no_guard_0_startval(
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; CHECK-NOT: vector.body:
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entry:
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br label %while.body
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while.body:
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%N.addr.09 = phi i32 [ %dec, %while.body ], [ 0, %entry ]
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%c.addr.08 = phi i8* [ %incdec.ptr4, %while.body ], [ %c, %entry ]
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%b.addr.07 = phi i8* [ %incdec.ptr1, %while.body ], [ %b, %entry ]
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%a.addr.06 = phi i8* [ %incdec.ptr, %while.body ], [ %a, %entry]
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%dec = add nsw i32 %N.addr.09, -1
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%incdec.ptr = getelementptr inbounds i8, i8* %a.addr.06, i32 1
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%0 = load i8, i8* %a.addr.06, align 1
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%incdec.ptr1 = getelementptr inbounds i8, i8* %b.addr.07, i32 1
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%1 = load i8, i8* %b.addr.07, align 1
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%add = add i8 %1, %0
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%incdec.ptr4 = getelementptr inbounds i8, i8* %c.addr.08, i32 1
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store i8 %add, i8* %c.addr.08, align 1
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%cmp = icmp sgt i32 %N.addr.09, 1
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br i1 %cmp, label %while.body, label %while.end.loopexit
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while.end.loopexit:
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br label %while.end
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while.end:
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ret void
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}
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define dso_local void @sgt_step_minus_two(i8* noalias nocapture readonly %a, i8* noalias nocapture readonly %b, i8* noalias nocapture %c, i32 %N) local_unnamed_addr #0 {
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; COMMON-LABEL: @sgt_step_minus_two(
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; COMMON: vector.body:
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; CHECK-TF: masked.load
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; CHECK-TF: masked.load
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; CHECK-TF: masked.store
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entry:
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%cmp5 = icmp sgt i32 %N, 0
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br i1 %cmp5, label %while.body.preheader, label %while.end
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while.body.preheader:
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br label %while.body
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while.body:
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%N.addr.09 = phi i32 [ %dec, %while.body ], [ %N, %while.body.preheader ]
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%c.addr.08 = phi i8* [ %incdec.ptr4, %while.body ], [ %c, %while.body.preheader ]
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%b.addr.07 = phi i8* [ %incdec.ptr1, %while.body ], [ %b, %while.body.preheader ]
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%a.addr.06 = phi i8* [ %incdec.ptr, %while.body ], [ %a, %while.body.preheader ]
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%dec = add nsw i32 %N.addr.09, -2
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%incdec.ptr = getelementptr inbounds i8, i8* %a.addr.06, i32 1
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%0 = load i8, i8* %a.addr.06, align 1
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%incdec.ptr1 = getelementptr inbounds i8, i8* %b.addr.07, i32 1
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%1 = load i8, i8* %b.addr.07, align 1
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%add = add i8 %1, %0
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%incdec.ptr4 = getelementptr inbounds i8, i8* %c.addr.08, i32 1
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store i8 %add, i8* %c.addr.08, align 1
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%cmp = icmp sgt i32 %N.addr.09, 1
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br i1 %cmp, label %while.body, label %while.end.loopexit
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while.end.loopexit:
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br label %while.end
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while.end:
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ret void
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}
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define dso_local void @sgt_step_not_constant(i8* noalias nocapture readonly %a, i8* noalias nocapture readonly %b, i8* noalias nocapture %c, i32 %N, i32 %S) local_unnamed_addr #0 {
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; COMMON-LABEL: @sgt_step_not_constant(
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; CHECK-NOT: vector.body:
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entry:
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%cmp5 = icmp sgt i32 %N, 0
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br i1 %cmp5, label %while.body.preheader, label %while.end
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while.body.preheader:
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br label %while.body
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while.body:
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%N.addr.09 = phi i32 [ %dec, %while.body ], [ %N, %while.body.preheader ]
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%c.addr.08 = phi i8* [ %incdec.ptr4, %while.body ], [ %c, %while.body.preheader ]
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%b.addr.07 = phi i8* [ %incdec.ptr1, %while.body ], [ %b, %while.body.preheader ]
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%a.addr.06 = phi i8* [ %incdec.ptr, %while.body ], [ %a, %while.body.preheader ]
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%dec = add nsw i32 %N.addr.09, %S
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%incdec.ptr = getelementptr inbounds i8, i8* %a.addr.06, i32 1
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%0 = load i8, i8* %a.addr.06, align 1
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%incdec.ptr1 = getelementptr inbounds i8, i8* %b.addr.07, i32 1
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%1 = load i8, i8* %b.addr.07, align 1
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%add = add i8 %1, %0
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%incdec.ptr4 = getelementptr inbounds i8, i8* %c.addr.08, i32 1
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store i8 %add, i8* %c.addr.08, align 1
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%cmp = icmp sgt i32 %N.addr.09, 1
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br i1 %cmp, label %while.body, label %while.end.loopexit
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while.end.loopexit:
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br label %while.end
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while.end:
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ret void
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}
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define dso_local void @icmp_eq(i8* noalias nocapture readonly %A, i8* noalias nocapture readonly %B, i8* noalias nocapture %C, i32 %N) #0 {
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; COMMON-LABEL: @icmp_eq
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; DEFAULT: vector.body:
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; TODO
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entry:
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%cmp6 = icmp eq i32 %N, 0
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br i1 %cmp6, label %while.end, label %while.body.preheader
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|
@ -44,4 +289,144 @@ while.end:
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ret void
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}
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; This IR corresponds to this type of C-code:
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;
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; void f(char *a, char *b, char * __restrict c, int N) {
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; for (int i = N; i>0; i--)
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; c[i] = a[i] + b[i];
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; }
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;
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define dso_local void @sgt_for_loop(i8* noalias nocapture readonly %a, i8* noalias nocapture readonly %b, i8* noalias nocapture %c, i32 %N) local_unnamed_addr #0 {
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; COMMON-LABEL: @sgt_for_loop(
|
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;
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; FIXME: we do want to support this case too, but is currently not recognised.
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;
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; DEFAULT-NOT: vector.body:
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; CHECK-TF-NOT: masked.load
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; CHECK-TF-NOT: masked.load
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; CHECK-TF-NOT: masked.store
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entry:
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%cmp5 = icmp sgt i32 %N, 0
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br i1 %cmp5, label %for.body.preheader, label %for.end
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for.body.preheader:
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br label %for.body
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for.body:
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%i.011 = phi i32 [ %dec, %for.body ], [ %N, %for.body.preheader ]
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%arrayidx = getelementptr inbounds i8, i8* %a, i32 %i.011
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%0 = load i8, i8* %arrayidx, align 1
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%arrayidx1 = getelementptr inbounds i8, i8* %b, i32 %i.011
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%1 = load i8, i8* %arrayidx1, align 1
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%add = add i8 %1, %0
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%arrayidx4 = getelementptr inbounds i8, i8* %c, i32 %i.011
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store i8 %add, i8* %arrayidx4, align 1
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%dec = add nsw i32 %i.011, -1
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%cmp = icmp sgt i32 %i.011, 1
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br i1 %cmp, label %for.body, label %for.end
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for.end:
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ret void
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}
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define dso_local void @sgt_for_loop_i64(i8* noalias nocapture readonly %a, i8* noalias nocapture readonly %b, i8* noalias nocapture %c, i32 %N) local_unnamed_addr #0 {
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; COMMON-LABEL: @sgt_for_loop_i64(
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; DEFAULT-NOT: vector.body:
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;
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; FIXME: this shoud be supported, but isn't currently.
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; CHECK-PREFER-NOT: masked.load
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; CHECK-PREFER-NOT: masked.load
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; CHECK-PREFER-NOT: masked.store
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;
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; With -disable-mve-tail-predication=false, the cost-model returns that
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; creating a hardwareloop is not profitable/possible, so here we don't
|
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; expect the tail-folding:
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;
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; CHECK-ENABLE-TP-NOT: masked.load
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; CHECK-ENABLE-TP-NOT: masked.load
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; CHECK-ENABLE-TP-NOT: masked.store
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;
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entry:
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%cmp14 = icmp sgt i32 %N, 0
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br i1 %cmp14, label %for.body.preheader, label %for.cond.cleanup
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for.body.preheader:
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%conv16 = zext i32 %N to i64
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br label %for.body
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for.cond.cleanup.loopexit:
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br label %for.cond.cleanup
|
||||
|
||||
for.cond.cleanup:
|
||||
ret void
|
||||
|
||||
for.body:
|
||||
%i.015 = phi i64 [ %dec, %for.body ], [ %conv16, %for.body.preheader ]
|
||||
%idxprom = trunc i64 %i.015 to i32
|
||||
%arrayidx = getelementptr inbounds i8, i8* %a, i32 %idxprom
|
||||
%0 = load i8, i8* %arrayidx, align 1
|
||||
%arrayidx4 = getelementptr inbounds i8, i8* %b, i32 %idxprom
|
||||
%1 = load i8, i8* %arrayidx4, align 1
|
||||
%add = add i8 %1, %0
|
||||
%arrayidx8 = getelementptr inbounds i8, i8* %c, i32 %idxprom
|
||||
store i8 %add, i8* %arrayidx8, align 1
|
||||
%dec = add nsw i64 %i.015, -1
|
||||
%cmp = icmp sgt i64 %i.015, 1
|
||||
br i1 %cmp, label %for.body, label %for.cond.cleanup.loopexit
|
||||
}
|
||||
|
||||
; This IR corresponds to this nested-loop:
|
||||
;
|
||||
; for (int i = 0; i<N; i++)
|
||||
; for (int j = i+1; j>0; j--)
|
||||
; c[j] = a[j] + b[j];
|
||||
;
|
||||
; while the inner-loop looks similar to previous examples, we can't
|
||||
; transform this because the inner loop because isGuarded returns
|
||||
; false for the inner-loop.
|
||||
;
|
||||
define dso_local void @sgt_nested_loop(i8* noalias nocapture readonly %a, i8* noalias nocapture readonly %b, i8* noalias nocapture %c, i32 %N) local_unnamed_addr #0 {
|
||||
; COMMON-LABEL: @sgt_nested_loop(
|
||||
; DEFAULT-NOT: vector.body:
|
||||
; CHECK-TF-NOT: masked.load
|
||||
; CHECK-TF-NOT: masked.load
|
||||
; CHECK-TF-NOT: masked.store
|
||||
; COMMON: }
|
||||
;
|
||||
entry:
|
||||
%cmp21 = icmp sgt i32 %N, 0
|
||||
br i1 %cmp21, label %for.body.preheader, label %for.cond.cleanup
|
||||
|
||||
for.body.preheader:
|
||||
br label %for.body
|
||||
|
||||
for.cond.loopexit:
|
||||
%exitcond = icmp eq i32 %add, %N
|
||||
br i1 %exitcond, label %for.cond.cleanup.loopexit, label %for.body
|
||||
|
||||
for.cond.cleanup.loopexit:
|
||||
br label %for.cond.cleanup
|
||||
|
||||
for.cond.cleanup:
|
||||
ret void
|
||||
|
||||
for.body:
|
||||
%i.022 = phi i32 [ %add, %for.cond.loopexit ], [ 0, %for.body.preheader ]
|
||||
%add = add nuw nsw i32 %i.022, 1
|
||||
br label %for.body4
|
||||
|
||||
for.body4: ; preds = %for.body, %for.body4
|
||||
%j.020 = phi i32 [ %add, %for.body ], [ %dec, %for.body4 ]
|
||||
%arrayidx = getelementptr inbounds i8, i8* %a, i32 %j.020
|
||||
%0 = load i8, i8* %arrayidx, align 1
|
||||
%arrayidx5 = getelementptr inbounds i8, i8* %b, i32 %j.020
|
||||
%1 = load i8, i8* %arrayidx5, align 1
|
||||
%add7 = add i8 %1, %0
|
||||
%arrayidx9 = getelementptr inbounds i8, i8* %c, i32 %j.020
|
||||
store i8 %add7, i8* %arrayidx9, align 1
|
||||
%dec = add nsw i32 %j.020, -1
|
||||
%cmp2 = icmp sgt i32 %j.020, 1
|
||||
br i1 %cmp2, label %for.body4, label %for.cond.loopexit
|
||||
}
|
||||
|
||||
attributes #0 = { nofree norecurse nounwind "target-features"="+armv8.1-m.main,+mve.fp" }
|
||||
|
|
|
|||
Loading…
Reference in New Issue