mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-11-24 03:33:20 +01:00
ffa0068101
In r267672, where the loop distribution pragma was introduced, I tried it hard to keep the old behavior for opt: when opt is invoked with -loop-distribute, it should distribute the loop (it's off by default when ran via the optimization pipeline). As MichaelZ has discovered this has the unintended consequence of breaking a very common developer work-flow to reproduce compilations using opt: First you print the pass pipeline of clang with -debug-pass=Arguments and then invoking opt with the returned arguments. clang -debug-pass will include -loop-distribute but the pass is invoked with default=off so nothing happens unless the loop carries the pragma. While through opt (default=on) we will try to distribute all loops. This changes opt's default to off as well to match clang. The tests are modified to explicitly enable the transformation. llvm-svn: 290235
108 lines
3.6 KiB
LLVM
108 lines
3.6 KiB
LLVM
; RUN: opt -basicaa -loop-distribute -enable-loop-distribute -loop-simplify -scoped-noalias \
|
|
; RUN: -loop-versioning -S < %s | FileCheck %s
|
|
|
|
; Test the metadata generated when versioning an already versioned loop. Here
|
|
; we invoke loop distribution to perform the first round of versioning. It
|
|
; adds memchecks for accesses that can alias across the distribution boundary.
|
|
; Then we further version the distributed loops to fully disambiguate accesses
|
|
; within each.
|
|
;
|
|
; So as an example, we add noalias between C and A during the versioning
|
|
; within loop distribution and then add noalias between C and D during the
|
|
; second explicit versioning step:
|
|
;
|
|
; for (i = 0; i < n; i++) {
|
|
; A[i + 1] = A[i] * B[i];
|
|
; -------------------------------
|
|
; C[i] = D[i] * E[i];
|
|
; }
|
|
|
|
; To see it easier what's going on, I expanded every noalias/scope metadata
|
|
; reference below in a comment. For a scope I use the format scope(domain),
|
|
; e.g. scope 17 in domain 15 is written as 17(15).
|
|
|
|
target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
|
|
|
|
@B = common global i32* null, align 8
|
|
@A = common global i32* null, align 8
|
|
@C = common global i32* null, align 8
|
|
@D = common global i32* null, align 8
|
|
@E = common global i32* null, align 8
|
|
|
|
define void @f() {
|
|
entry:
|
|
%a = load i32*, i32** @A, align 8
|
|
%b = load i32*, i32** @B, align 8
|
|
%c = load i32*, i32** @C, align 8
|
|
%d = load i32*, i32** @D, align 8
|
|
%e = load i32*, i32** @E, align 8
|
|
br label %for.body
|
|
|
|
for.body: ; preds = %for.body, %entry
|
|
%ind = phi i64 [ 0, %entry ], [ %add, %for.body ]
|
|
|
|
%arrayidxA = getelementptr inbounds i32, i32* %a, i64 %ind
|
|
|
|
; CHECK: %loadA.ldist1 = {{.*}} !noalias !25
|
|
; A noalias C: !25 -> { 17(15), 18(15), 19(15), 26(24) }
|
|
; ^^^^^^
|
|
%loadA = load i32, i32* %arrayidxA, align 4
|
|
|
|
%arrayidxB = getelementptr inbounds i32, i32* %b, i64 %ind
|
|
%loadB = load i32, i32* %arrayidxB, align 4
|
|
|
|
%mulA = mul i32 %loadB, %loadA
|
|
|
|
%add = add nuw nsw i64 %ind, 1
|
|
%arrayidxA_plus_4 = getelementptr inbounds i32, i32* %a, i64 %add
|
|
store i32 %mulA, i32* %arrayidxA_plus_4, align 4
|
|
|
|
; CHECK: for.body:
|
|
|
|
%arrayidxD = getelementptr inbounds i32, i32* %d, i64 %ind
|
|
|
|
; CHECK: %loadD = {{.*}} !alias.scope !31
|
|
; D's scope: !31 -> { 18(15), 32(33) }
|
|
; ^^^^^^
|
|
%loadD = load i32, i32* %arrayidxD, align 4
|
|
|
|
%arrayidxE = getelementptr inbounds i32, i32* %e, i64 %ind
|
|
|
|
; CHECK: %loadE = {{.*}} !alias.scope !34
|
|
; E's scope: !34 -> { 19(15), 35(33) }
|
|
; ^^^^^^
|
|
%loadE = load i32, i32* %arrayidxE, align 4
|
|
|
|
%mulC = mul i32 %loadD, %loadE
|
|
|
|
%arrayidxC = getelementptr inbounds i32, i32* %c, i64 %ind
|
|
|
|
; CHECK: store i32 %mulC, {{.*}} !alias.scope !36, !noalias !38
|
|
; C's scope: !36 -> { 17(15), 37(33) }
|
|
; ^^^^^^
|
|
; C noalias D and E: !38 -> { 21(15), 32(33), 35(33) }
|
|
; ^^^^^^ ^^^^^^
|
|
store i32 %mulC, i32* %arrayidxC, align 4
|
|
|
|
%exitcond = icmp eq i64 %add, 20
|
|
br i1 %exitcond, label %for.end, label %for.body
|
|
|
|
for.end: ; preds = %for.body
|
|
ret void
|
|
}
|
|
|
|
; Domain for the second loop versioning for the top loop after
|
|
; distribution.
|
|
; CHECK: !15 = distinct !{!15, !"LVerDomain"}
|
|
; CHECK: !17 = distinct !{!17, !15}
|
|
; CHECK: !25 = !{!17, !18, !19, !26}
|
|
; CHECK: !31 = !{!18, !32}
|
|
; CHECK: !32 = distinct !{!32, !33}
|
|
; Domain for the second loop versioning for the bottom loop after
|
|
; distribution.
|
|
; CHECK: !33 = distinct !{!33, !"LVerDomain"}
|
|
; CHECK: !34 = !{!19, !35}
|
|
; CHECK: !35 = distinct !{!35, !33}
|
|
; CHECK: !36 = !{!17, !37}
|
|
; CHECK: !38 = !{!21, !32, !35}
|