llvm-6502/test/Transforms/InstCombine/load.ll
Chris Lattner 15cc608a8f new testcase
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23323 91177308-0d34-0410-b5e6-96231b3b80d8
2005-09-12 23:22:17 +00:00

89 lines
1.8 KiB
LLVM

; This test makes sure that these instructions are properly eliminated.
;
; RUN: llvm-as < %s | opt -instcombine | llvm-dis | not grep load
%X = constant int 42
%X2 = constant int 47
%Y = constant [2 x { int, float }] [ { int, float } { int 12, float 1.0 },
{ int, float } { int 37, float 1.2312 } ]
%Z = constant [2 x { int, float }] zeroinitializer
int %test1() {
%B = load int* %X
ret int %B
}
float %test2() {
%A = getelementptr [2 x { int, float}]* %Y, long 0, long 1, ubyte 1
%B = load float* %A
ret float %B
}
int %test3() {
%A = getelementptr [2 x { int, float}]* %Y, long 0, long 0, ubyte 0
%B = load int* %A
ret int %B
}
int %test4() {
%A = getelementptr [2 x { int, float}]* %Z, long 0, long 1, ubyte 0
%B = load int* %A
ret int %B
}
; load (select (Cond, &V1, &V2)) --> select(Cond, load &V1, load &V2)
int %test5(bool %C) {
%Y = select bool %C, int* %X, int* %X2
%Z = load int* %Y
ret int %Z
}
; load (phi (&V1, &V2, &V3)) --> phi(load &V1, load &V2, load &V3)
int %test6(bool %C) {
entry:
br bool %C, label %cond_true.i, label %cond_continue.i
cond_true.i:
br label %cond_continue.i
cond_continue.i:
%mem_tmp.i.0 = phi int* [ %X, %cond_true.i ], [ %X2, %entry ]
%tmp.3 = load int* %mem_tmp.i.0
ret int %tmp.3
}
int %test7(int %X) {
%V = getelementptr int* null, int %X
%R = load int* %V
ret int %R
}
int %test8(int* %P) {
store int 1, int* %P
%X = load int* %P ;; Trivial store->load forwarding
ret int %X
}
int %test9(int* %P) {
%X = load int* %P ;; Trivial load cse
%Y = load int* %P
%Z = sub int %X, %Y
ret int %Z
}
int %test10(bool %C, int* %P, int* %Q) {
br bool %C, label %T, label %F
T:
store int 1, int* %Q
store int 0, int* %P
br label %C
F:
store int 0, int* %P
br label %C
C:
%V = load int* %P ;; always 0
ret int %V
}