http://llvm.org/bugs/show_bug.cgi?id=4178
Summary: missed optimization: global variable not inlined
Product: libraries
Version: trunk
Platform: PC
OS/Version: Windows NT
Status: NEW
Severity: normal
Priority: P2
Component: Global Analyses
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
In this example, the global variable can be inlined and thus removing a load
operation.
; ModuleID = 'test-opt.bc'
target datalayout =
"e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16:16-i32:32:32:32-i64:64:64:64-f32:32:32:32-f64:64:64:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"
target triple = "i686-pc-win32"
@y = global i32 3, align 4 ; <i32*> [#uses=1]
define void @test_and(i32 %x, i32 addrspace(1)* %res) {
entry:
%tmp = load i32* @y ; <i32> [#uses=2]
%tmp1 = add i32 %tmp, %tmp ; <i32> [#uses=1]
%arrayidx = getelementptr i32 addrspace(1)* %res, i32 %tmp1
; <i32 addrspace(1)*> [#uses=1]
%arrayidx6 = getelementptr i32 addrspace(1)* %res, i32 %x
; <i32 addrspace(1)*> [#uses=1]
%tmp7 = load i32 addrspace(1)* %arrayidx6 ; <i32>
[#uses=1]
store i32 %tmp7, i32 addrspace(1)* %arrayidx
ret void
}
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