File: 2008-07-08-VolatileLoadMerge.ll

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llvm-toolchain-20 1%3A20.1.8-1
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; RUN: opt < %s -passes=instcombine -S | grep "load volatile" | count 2
; PR2496
target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"
target triple = "i386-apple-darwin8"
@g_1 = internal global i32 0		; <ptr> [#uses=3]

define i32 @main() nounwind  {
entry:
	%tmp93 = icmp slt i32 0, 10		; <i1> [#uses=0]
	%tmp34 = load volatile i32, ptr @g_1, align 4		; <i32> [#uses=1]
	br label %bb

bb:		; preds = %bb, %entry
	%b.0.reg2mem.0 = phi i32 [ 0, %entry ], [ %tmp6, %bb ]		; <i32> [#uses=1]
	%tmp3.reg2mem.0 = phi i32 [ %tmp3, %bb ], [ %tmp34, %entry ]
	%tmp4 = add i32 %tmp3.reg2mem.0, 5		; <i32> [#uses=1]
	store volatile i32 %tmp4, ptr @g_1, align 4
	%tmp6 = add i32 %b.0.reg2mem.0, 1		; <i32> [#uses=2]
	%tmp9 = icmp slt i32 %tmp6, 10		; <i1> [#uses=1]
	%tmp3 = load volatile i32, ptr @g_1, align 4		; <i32> [#uses=1]
	br i1 %tmp9, label %bb, label %bb11

bb11:		; preds = %bb
	ret i32 0
}