2008-07-13-InfLoopMiscompile.ll   [plain text]

; RUN: llvm-as < %s | opt -simplifycfg | llvm-dis | grep {%outval = phi i32 .*mux}
; PR2540
; Outval should end up with a select from 0/2, not all constants.

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-f80:32:32"
target triple = "i386-pc-linux-gnu"
@g_37 = common global i32 0		; <i32*> [#uses=1]
@.str = internal constant [4 x i8] c"%d\0A\00"		; <[4 x i8]*> [#uses=1]

define i32 @main() nounwind  {
entry:
	%l = load i32* @g_37, align 4		; <i32> [#uses=1]
	%cmpa = icmp ne i32 %l, 0		; <i1> [#uses=3]
	br i1 %cmpa, label %func_1.exit, label %mooseblock

mooseblock:		; preds = %entry
	%cmpb = icmp eq i1 %cmpa, false		; <i1> [#uses=2]
	br i1 %cmpb, label %monkeyblock, label %beeblock

monkeyblock:		; preds = %monkeyblock, %mooseblock
	br i1 %cmpb, label %cowblock, label %monkeyblock

beeblock:		; preds = %beeblock, %mooseblock
	br i1 %cmpa, label %cowblock, label %beeblock

cowblock:		; preds = %beeblock, %monkeyblock
	%cowval = phi i32 [ 2, %beeblock ], [ 0, %monkeyblock ]		; <i32> [#uses=1]
	br label %func_1.exit

func_1.exit:		; preds = %cowblock, %entry
	%outval = phi i32 [ %cowval, %cowblock ], [ 1, %entry ]		; <i32> [#uses=1]
	%pout = tail call i32 (i8*, ...)* @printf( i8* noalias  getelementptr ([4 x i8]* @.str, i32 0, i32 0), i32 %outval ) nounwind 		; <i32> [#uses=0]
	ret i32 0
}

declare i32 @printf(i8*, ...) nounwind