replica
/
hanchenye-llvm-project
2
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

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). 

llvm-svn: 90012
This commit is contained in:
Chris Lattner 2009-11-27 18:08:30 +00:00
parent 3d9823b9cf
commit e66f84e012
1 changed files with 121 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

121
llvm/test/Transforms/GVN/pre-load.ll
View File

@ -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
}