mirror of
https://github.com/c64scene-ar/llvm-6502.git
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23323 91177308-0d34-0410-b5e6-96231b3b80d8
89 lines
1.8 KiB
LLVM
89 lines
1.8 KiB
LLVM
; This test makes sure that these instructions are properly eliminated.
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;
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; RUN: llvm-as < %s | opt -instcombine | llvm-dis | not grep load
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%X = constant int 42
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%X2 = constant int 47
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%Y = constant [2 x { int, float }] [ { int, float } { int 12, float 1.0 },
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{ int, float } { int 37, float 1.2312 } ]
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%Z = constant [2 x { int, float }] zeroinitializer
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int %test1() {
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%B = load int* %X
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ret int %B
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}
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float %test2() {
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%A = getelementptr [2 x { int, float}]* %Y, long 0, long 1, ubyte 1
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%B = load float* %A
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ret float %B
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}
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int %test3() {
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%A = getelementptr [2 x { int, float}]* %Y, long 0, long 0, ubyte 0
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%B = load int* %A
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ret int %B
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}
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int %test4() {
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%A = getelementptr [2 x { int, float}]* %Z, long 0, long 1, ubyte 0
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%B = load int* %A
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ret int %B
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}
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; load (select (Cond, &V1, &V2)) --> select(Cond, load &V1, load &V2)
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int %test5(bool %C) {
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%Y = select bool %C, int* %X, int* %X2
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%Z = load int* %Y
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ret int %Z
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}
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; load (phi (&V1, &V2, &V3)) --> phi(load &V1, load &V2, load &V3)
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int %test6(bool %C) {
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entry:
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br bool %C, label %cond_true.i, label %cond_continue.i
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cond_true.i:
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br label %cond_continue.i
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cond_continue.i:
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%mem_tmp.i.0 = phi int* [ %X, %cond_true.i ], [ %X2, %entry ]
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%tmp.3 = load int* %mem_tmp.i.0
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ret int %tmp.3
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}
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int %test7(int %X) {
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%V = getelementptr int* null, int %X
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%R = load int* %V
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ret int %R
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}
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int %test8(int* %P) {
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store int 1, int* %P
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%X = load int* %P ;; Trivial store->load forwarding
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ret int %X
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}
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int %test9(int* %P) {
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%X = load int* %P ;; Trivial load cse
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%Y = load int* %P
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%Z = sub int %X, %Y
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ret int %Z
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}
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int %test10(bool %C, int* %P, int* %Q) {
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br bool %C, label %T, label %F
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T:
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store int 1, int* %Q
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store int 0, int* %P
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br label %C
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F:
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store int 0, int* %P
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br label %C
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C:
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%V = load int* %P ;; always 0
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ret int %V
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}
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