mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-12-17 03:30:28 +00:00
1fb6e41822
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@16405 91177308-0d34-0410-b5e6-96231b3b80d8
38 lines
1.2 KiB
LLVM
38 lines
1.2 KiB
LLVM
; RUN: llvm-as < %s | opt -instcombine -mem2reg | llvm-dis | not grep alloca
|
|
;
|
|
; This tests to see if mem2reg can promote alloca instructions whose addresses
|
|
; are used by PHI nodes that are immediately loaded. The LLVM C++ front-end
|
|
; often generates code that looks like this (when it codegen's ?: exprs as
|
|
; lvalues), so handling this simple extension is quite useful.
|
|
;
|
|
; This testcase is what the following program looks like when it reaches
|
|
; instcombine:
|
|
;
|
|
; template<typename T>
|
|
; const T& max(const T& a1, const T& a2) { return a1 < a2 ? a1 : a2; }
|
|
; int main() { return max(0, 1); }
|
|
;
|
|
; This test checks to make sure the combination of instcombine and mem2reg
|
|
; perform the transformation.
|
|
|
|
int %main() {
|
|
entry:
|
|
%mem_tmp.0 = alloca int
|
|
%mem_tmp.1 = alloca int
|
|
store int 0, int* %mem_tmp.0
|
|
store int 1, int* %mem_tmp.1
|
|
%tmp.1.i = load int* %mem_tmp.1
|
|
%tmp.3.i = load int* %mem_tmp.0
|
|
%tmp.4.i = setle int %tmp.1.i, %tmp.3.i
|
|
br bool %tmp.4.i, 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* [ %mem_tmp.1, %cond_true.i ], [ %mem_tmp.0, %entry ]
|
|
%tmp.3 = load int* %mem_tmp.i.0
|
|
ret int %tmp.3
|
|
}
|
|
|