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add two simple test cases we now optimize (to one load in the loop each) and one we don't (corresponding to the fixme I added yesterday).

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llvm-svn: 90012
This commit is contained in:
Chris Lattner 2009-11-27 18:08:30 +00:00
parent bdaed088ea
commit 6f124b48c3
1 changed files with 121 additions and 0 deletions
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121
test/Transforms/GVN/pre-load.ll
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@ -1,4 +1,5 @@
; RUN: opt < %s -gvn -enable-load-pre -S | FileCheck %s
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
define i32 @test1(i32* %p, i1 %C) {
; CHECK: @test1
@ -107,3 +108,123 @@ block4:
; CHECK-NOT: load
; CHECK: ret i32
}
;void test5(int N, double *G) {
; int j;
; for (j = 0; j < N - 1; j++)
; G[j] = G[j] + G[j+1];
;}
define void @test5(i32 %N, double* nocapture %G) nounwind ssp {
; CHECK: @test5
entry:
%0 = add i32 %N, -1
%1 = icmp sgt i32 %0, 0
br i1 %1, label %bb.nph, label %return
bb.nph:
%tmp = zext i32 %0 to i64
br label %bb
; CHECK: bb.nph:
; CHECK: load double*
; CHECK: br label %bb
bb:
%indvar = phi i64 [ 0, %bb.nph ], [ %tmp6, %bb ]
%tmp6 = add i64 %indvar, 1
%scevgep = getelementptr double* %G, i64 %tmp6
%scevgep7 = getelementptr double* %G, i64 %indvar
%2 = load double* %scevgep7, align 8
%3 = load double* %scevgep, align 8
%4 = fadd double %2, %3
store double %4, double* %scevgep7, align 8
%exitcond = icmp eq i64 %tmp6, %tmp
br i1 %exitcond, label %return, label %bb
; Should only be one load in the loop.
; CHECK: bb:
; CHECK: load double*
; CHECK-NOT: load double*
; CHECK: br i1 %exitcond
return:
ret void
}
;void test6(int N, double *G) {
; int j;
; for (j = 0; j < N - 1; j++)
; G[j+1] = G[j] + G[j+1];
;}
define void @test6(i32 %N, double* nocapture %G) nounwind ssp {
; CHECK: @test6
entry:
%0 = add i32 %N, -1
%1 = icmp sgt i32 %0, 0
br i1 %1, label %bb.nph, label %return
bb.nph:
%tmp = zext i32 %0 to i64
br label %bb
; CHECK: bb.nph:
; CHECK: load double*
; CHECK: br label %bb
bb:
%indvar = phi i64 [ 0, %bb.nph ], [ %tmp6, %bb ]
%tmp6 = add i64 %indvar, 1
%scevgep = getelementptr double* %G, i64 %tmp6
%scevgep7 = getelementptr double* %G, i64 %indvar
%2 = load double* %scevgep7, align 8
%3 = load double* %scevgep, align 8
%4 = fadd double %2, %3
store double %4, double* %scevgep, align 8
%exitcond = icmp eq i64 %tmp6, %tmp
br i1 %exitcond, label %return, label %bb
; Should only be one load in the loop.
; CHECK: bb:
; CHECK: load double*
; CHECK-NOT: load double*
; CHECK: br i1 %exitcond
return:
ret void
}
;;; --- todo
;; Here the loaded address isn't available in 'block2' at all.
define i32 @testX(i32* %p, i32* %q, i32** %Hack, i1 %C) {
; CHECK: @testX
block1:
br i1 %C, label %block2, label %block3
block2:
br label %block4
; HECK: block2:
; HECK: load i32*
; HECK: br label %block4
block3:
%A = getelementptr i32* %p, i32 1
store i32 0, i32* %A
br label %block4
block4:
%P2 = phi i32* [%p, %block3], [%q, %block2]
%P3 = getelementptr i32* %P2, i32 1
%PRE = load i32* %P3
ret i32 %PRE
; HECK: block4:
; HECK-NEXT: phi i32 [
; HECK-NOT: load
; HECK: ret i32
}