mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-12-18 10:31:57 +00:00
8ebaf90958
This fixes a FIXME in scev-aa.ll (allowing a new no-alias result) and generally makes things more precise. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@125449 91177308-0d34-0410-b5e6-96231b3b80d8
216 lines
6.4 KiB
LLVM
216 lines
6.4 KiB
LLVM
; RUN: opt < %s -scev-aa -aa-eval -print-all-alias-modref-info \
|
|
; RUN: |& FileCheck %s
|
|
|
|
; At the time of this writing, -basicaa misses the example of the form
|
|
; A[i+(j+1)] != A[i+j], which can arise from multi-dimensional array references,
|
|
; and the example of the form A[0] != A[i+1], where i+1 is known to be positive.
|
|
|
|
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64"
|
|
|
|
; p[i] and p[i+1] don't alias.
|
|
|
|
; CHECK: Function: loop: 3 pointers, 0 call sites
|
|
; CHECK: NoAlias: double* %pi, double* %pi.next
|
|
|
|
define void @loop(double* nocapture %p, i64 %n) nounwind {
|
|
entry:
|
|
%j = icmp sgt i64 %n, 0
|
|
br i1 %j, label %bb, label %return
|
|
|
|
bb:
|
|
%i = phi i64 [ 0, %entry ], [ %i.next, %bb ]
|
|
%pi = getelementptr double* %p, i64 %i
|
|
%i.next = add i64 %i, 1
|
|
%pi.next = getelementptr double* %p, i64 %i.next
|
|
%x = load double* %pi
|
|
%y = load double* %pi.next
|
|
%z = fmul double %x, %y
|
|
store double %z, double* %pi
|
|
%exitcond = icmp eq i64 %i.next, %n
|
|
br i1 %exitcond, label %return, label %bb
|
|
|
|
return:
|
|
ret void
|
|
}
|
|
|
|
; Slightly more involved: p[j][i], p[j][i+1], and p[j+1][i] don't alias.
|
|
|
|
; CHECK: Function: nestedloop: 4 pointers, 0 call sites
|
|
; CHECK: NoAlias: double* %pi.j, double* %pi.next.j
|
|
; CHECK: NoAlias: double* %pi.j, double* %pi.j.next
|
|
; CHECK: NoAlias: double* %pi.j.next, double* %pi.next.j
|
|
|
|
define void @nestedloop(double* nocapture %p, i64 %m) nounwind {
|
|
entry:
|
|
%k = icmp sgt i64 %m, 0
|
|
br i1 %k, label %guard, label %return
|
|
|
|
guard:
|
|
%l = icmp sgt i64 91, 0
|
|
br i1 %l, label %outer.loop, label %return
|
|
|
|
outer.loop:
|
|
%j = phi i64 [ 0, %guard ], [ %j.next, %outer.latch ]
|
|
br label %bb
|
|
|
|
bb:
|
|
%i = phi i64 [ 0, %outer.loop ], [ %i.next, %bb ]
|
|
%i.next = add i64 %i, 1
|
|
|
|
%e = add i64 %i, %j
|
|
%pi.j = getelementptr double* %p, i64 %e
|
|
%f = add i64 %i.next, %j
|
|
%pi.next.j = getelementptr double* %p, i64 %f
|
|
%x = load double* %pi.j
|
|
%y = load double* %pi.next.j
|
|
%z = fmul double %x, %y
|
|
store double %z, double* %pi.j
|
|
|
|
%o = add i64 %j, 91
|
|
%g = add i64 %i, %o
|
|
%pi.j.next = getelementptr double* %p, i64 %g
|
|
%a = load double* %pi.j.next
|
|
%b = fmul double %x, %a
|
|
store double %b, double* %pi.j.next
|
|
|
|
%exitcond = icmp eq i64 %i.next, 91
|
|
br i1 %exitcond, label %outer.latch, label %bb
|
|
|
|
outer.latch:
|
|
%j.next = add i64 %j, 91
|
|
%h = icmp eq i64 %j.next, %m
|
|
br i1 %h, label %return, label %outer.loop
|
|
|
|
return:
|
|
ret void
|
|
}
|
|
|
|
; Even more involved: same as nestedloop, but with a variable extent.
|
|
; When n is 1, p[j+1][i] does alias p[j][i+1], and there's no way to
|
|
; prove whether n will be greater than 1, so that relation will always
|
|
; by MayAlias. The loop is guarded by a n > 0 test though, so
|
|
; p[j+1][i] and p[j][i] can theoretically be determined to be NoAlias,
|
|
; however the analysis currently doesn't do that.
|
|
; TODO: Make the analysis smarter and turn that MayAlias into a NoAlias.
|
|
|
|
; CHECK: Function: nestedloop_more: 4 pointers, 0 call sites
|
|
; CHECK: NoAlias: double* %pi.j, double* %pi.next.j
|
|
; CHECK: MayAlias: double* %pi.j, double* %pi.j.next
|
|
|
|
define void @nestedloop_more(double* nocapture %p, i64 %n, i64 %m) nounwind {
|
|
entry:
|
|
%k = icmp sgt i64 %m, 0
|
|
br i1 %k, label %guard, label %return
|
|
|
|
guard:
|
|
%l = icmp sgt i64 %n, 0
|
|
br i1 %l, label %outer.loop, label %return
|
|
|
|
outer.loop:
|
|
%j = phi i64 [ 0, %guard ], [ %j.next, %outer.latch ]
|
|
br label %bb
|
|
|
|
bb:
|
|
%i = phi i64 [ 0, %outer.loop ], [ %i.next, %bb ]
|
|
%i.next = add i64 %i, 1
|
|
|
|
%e = add i64 %i, %j
|
|
%pi.j = getelementptr double* %p, i64 %e
|
|
%f = add i64 %i.next, %j
|
|
%pi.next.j = getelementptr double* %p, i64 %f
|
|
%x = load double* %pi.j
|
|
%y = load double* %pi.next.j
|
|
%z = fmul double %x, %y
|
|
store double %z, double* %pi.j
|
|
|
|
%o = add i64 %j, %n
|
|
%g = add i64 %i, %o
|
|
%pi.j.next = getelementptr double* %p, i64 %g
|
|
%a = load double* %pi.j.next
|
|
%b = fmul double %x, %a
|
|
store double %b, double* %pi.j.next
|
|
|
|
%exitcond = icmp eq i64 %i.next, %n
|
|
br i1 %exitcond, label %outer.latch, label %bb
|
|
|
|
outer.latch:
|
|
%j.next = add i64 %j, %n
|
|
%h = icmp eq i64 %j.next, %m
|
|
br i1 %h, label %return, label %outer.loop
|
|
|
|
return:
|
|
ret void
|
|
}
|
|
|
|
; ScalarEvolution expands field offsets into constants, which allows it to
|
|
; do aggressive analysis. Contrast this with BasicAA, which works by
|
|
; recognizing GEP idioms.
|
|
|
|
%struct.A = type { %struct.B, i32, i32 }
|
|
%struct.B = type { double }
|
|
|
|
; CHECK: Function: foo: 7 pointers, 0 call sites
|
|
; CHECK: NoAlias: %struct.B* %B, i32* %Z
|
|
; CHECK: NoAlias: %struct.B* %B, %struct.B* %C
|
|
; CHECK: MustAlias: %struct.B* %C, i32* %Z
|
|
; CHECK: NoAlias: %struct.B* %B, i32* %X
|
|
; CHECK: MustAlias: i32* %X, i32* %Z
|
|
; CHECK: MustAlias: %struct.B* %C, i32* %Y
|
|
; CHECK: MustAlias: i32* %X, i32* %Y
|
|
|
|
define void @foo() {
|
|
entry:
|
|
%A = alloca %struct.A
|
|
%B = getelementptr %struct.A* %A, i32 0, i32 0
|
|
%Q = bitcast %struct.B* %B to %struct.A*
|
|
%Z = getelementptr %struct.A* %Q, i32 0, i32 1
|
|
%C = getelementptr %struct.B* %B, i32 1
|
|
%X = bitcast %struct.B* %C to i32*
|
|
%Y = getelementptr %struct.A* %A, i32 0, i32 1
|
|
ret void
|
|
}
|
|
|
|
; CHECK: Function: bar: 7 pointers, 0 call sites
|
|
; CHECK: NoAlias: %struct.B* %N, i32* %P
|
|
; CHECK: NoAlias: %struct.B* %N, %struct.B* %R
|
|
; CHECK: MustAlias: %struct.B* %R, i32* %P
|
|
; CHECK: NoAlias: %struct.B* %N, i32* %W
|
|
; CHECK: MustAlias: i32* %P, i32* %W
|
|
; CHECK: MustAlias: %struct.B* %R, i32* %V
|
|
; CHECK: MustAlias: i32* %V, i32* %W
|
|
|
|
define void @bar() {
|
|
%M = alloca %struct.A
|
|
%N = getelementptr %struct.A* %M, i32 0, i32 0
|
|
%O = bitcast %struct.B* %N to %struct.A*
|
|
%P = getelementptr %struct.A* %O, i32 0, i32 1
|
|
%R = getelementptr %struct.B* %N, i32 1
|
|
%W = bitcast %struct.B* %R to i32*
|
|
%V = getelementptr %struct.A* %M, i32 0, i32 1
|
|
ret void
|
|
}
|
|
|
|
; CHECK: Function: nonnegative: 2 pointers, 0 call sites
|
|
; CHECK: NoAlias: i64* %arrayidx, i64* %p
|
|
|
|
define void @nonnegative(i64* %p) nounwind {
|
|
entry:
|
|
br label %for.body
|
|
|
|
for.body: ; preds = %entry, %for.body
|
|
%i = phi i64 [ %inc, %for.body ], [ 0, %entry ] ; <i64> [#uses=2]
|
|
%inc = add nsw i64 %i, 1 ; <i64> [#uses=2]
|
|
%arrayidx = getelementptr inbounds i64* %p, i64 %inc
|
|
store i64 0, i64* %arrayidx
|
|
%tmp6 = load i64* %p ; <i64> [#uses=1]
|
|
%cmp = icmp slt i64 %inc, %tmp6 ; <i1> [#uses=1]
|
|
br i1 %cmp, label %for.body, label %for.end
|
|
|
|
for.end: ; preds = %for.body, %entry
|
|
ret void
|
|
}
|
|
|
|
; CHECK: 14 no alias responses
|
|
; CHECK: 26 may alias responses
|
|
; CHECK: 18 must alias responses
|