1 ; RUN: llc < %s -verify-machineinstrs -mcpu=generic -mtriple=x86_64-linux | FileCheck %s 2 3 target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128" 4 target triple = "x86_64-apple-macosx10.7.0" 5 6 ; In the code below we need to copy the EFLAGS because of scheduling constraints. 7 ; When copying the EFLAGS we need to write to the stack with push/pop. This forces 8 ; us to emit the prolog. 9 10 ; CHECK: main 11 ; CHECK: subq{{.*}}rsp 12 ; CHECK: ret 13 define i32 @main(i32 %arg, i8** %arg1) nounwind { 14 bb: 15 %tmp = alloca i32, align 4 ; [#uses=3 type=i32*] 16 %tmp2 = alloca i32, align 4 ; [#uses=3 type=i32*] 17 %tmp3 = alloca i32 ; [#uses=1 type=i32*] 18 store i32 1, i32* %tmp, align 4 19 store i32 1, i32* %tmp2, align 4 20 br label %bb4 21 22 bb4: ; preds = %bb4, %bb 23 %tmp6 = load i32, i32* %tmp2, align 4 ; [#uses=1 type=i32] 24 %tmp7 = add i32 %tmp6, -1 ; [#uses=2 type=i32] 25 store i32 %tmp7, i32* %tmp2, align 4 26 %tmp8 = icmp eq i32 %tmp7, 0 ; [#uses=1 type=i1] 27 %tmp9 = load i32, i32* %tmp ; [#uses=1 type=i32] 28 %tmp10 = add i32 %tmp9, -1 ; [#uses=1 type=i32] 29 store i32 %tmp10, i32* %tmp3 30 br i1 %tmp8, label %bb11, label %bb4 31 32 bb11: ; preds = %bb4 33 %tmp12 = load i32, i32* %tmp, align 4 ; [#uses=1 type=i32] 34 ret i32 %tmp12 35 } 36 37 38
