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rewrite the memset_pattern pattern generation stuff to accept any 2/4/8/16-byte

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constant, including globals.  This makes us generate much more "pretty" pattern
globals as well because it doesn't break it down to an array of bytes all the
time.

This enables us to handle stores of relocatable globals.  This kicks in about
48 times in 254.gap, giving us stuff like this:

@.memset_pattern40 = internal constant [2 x %struct.TypHeader* (%struct.TypHeader*, %struct.TypHeader*)*] [%struct.TypHeader* (%struct.TypHeader*, %struct
.TypHeader*)* @IsFalse, %struct.TypHeader* (%struct.TypHeader*, %struct.TypHeader*)* @IsFalse], align 16

...
  call void @memset_pattern16(i8* %scevgep5859, i8* bitcast ([2 x %struct.TypHeader* (%struct.TypHeader*, %struct.TypHeader*)*]* @.memset_pattern40 to i8*
), i64 %tmp75) nounwind



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@126044 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2011-02-19 19:56:44 +00:00
parent 41bfbb0a87
commit 80e8b506b8
2 changed files with 39 additions and 34 deletions
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29
test/Transforms/LoopIdiom/basic.ll
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@@ -277,7 +277,7 @@ for.end13: ; preds = %for.inc10
; On darwin10 (which is the triple in this .ll file) this loop can be turned
; into a memset_pattern call.
; rdar://9009151
define void @test11(i32* nocapture %P) nounwind ssp {
define void @test11_pattern(i32* nocapture %P) nounwind ssp {
entry:
br label %for.body
@@ -291,7 +291,7 @@ for.body: ; preds = %entry, %for.body
for.end: ; preds = %for.body
ret void
; CHECK: @test11
; CHECK: @test11_pattern
; CHECK-NEXT: entry:
; CHECK-NEXT: bitcast
; CHECK-NEXT: memset_pattern
@@ -322,3 +322,28 @@ for.end: ; preds = %for.body
; CHECK: ret void
}
@G = global i32 5
; This store-of-address loop can be turned into a memset_pattern call.
; rdar://9009151
define void @test13_pattern(i32** nocapture %P) nounwind ssp {
entry:
br label %for.body
for.body: ; preds = %entry, %for.body
%indvar = phi i64 [ 0, %entry ], [ %indvar.next, %for.body ]
%arrayidx = getelementptr i32** %P, i64 %indvar
store i32* @G, i32** %arrayidx, align 4
%indvar.next = add i64 %indvar, 1
%exitcond = icmp eq i64 %indvar.next, 10000
br i1 %exitcond, label %for.end, label %for.body
for.end: ; preds = %for.body
ret void
; CHECK: @test13_pattern
; CHECK-NEXT: entry:
; CHECK-NEXT: bitcast
; CHECK-NEXT: memset_pattern
; CHECK-NOT: store
; CHECK: ret void
}