1 ; RUN: llc -mtriple=thumb-eabi %s -o /dev/null 2 ; RUN: llc -mtriple=thumb-linux %s -o - | FileCheck %s 3 ; RUN: llc -mtriple=thumb-darwin %s -o - | FileCheck %s 4 5 @str = internal constant [4 x i8] c"%d\0A\00" ; <[4 x i8]*> [#uses=1] 6 7 define void @f(i32 %a, ...) { 8 entry: 9 ; Check that space is reserved above the pushed lr for variadic argument 10 ; registers to be stored in. 11 ; CHECK: sub sp, #[[IMM:[0-9]+]] 12 ; CHECK: push 13 %va = alloca i8*, align 4 ; <i8**> [#uses=4] 14 %va.upgrd.1 = bitcast i8** %va to i8* ; <i8*> [#uses=1] 15 call void @llvm.va_start( i8* %va.upgrd.1 ) 16 br label %bb 17 18 bb: ; preds = %bb, %entry 19 %a_addr.0 = phi i32 [ %a, %entry ], [ %tmp5, %bb ] ; <i32> [#uses=2] 20 %tmp = load volatile i8*, i8** %va ; <i8*> [#uses=2] 21 %tmp2 = getelementptr i8, i8* %tmp, i32 4 ; <i8*> [#uses=1] 22 store volatile i8* %tmp2, i8** %va 23 %tmp5 = add i32 %a_addr.0, -1 ; <i32> [#uses=1] 24 %tmp.upgrd.2 = icmp eq i32 %a_addr.0, 1 ; <i1> [#uses=1] 25 br i1 %tmp.upgrd.2, label %bb7, label %bb 26 27 bb7: ; preds = %bb 28 %tmp3 = bitcast i8* %tmp to i32* ; <i32*> [#uses=1] 29 %tmp.upgrd.3 = load i32, i32* %tmp3 ; <i32> [#uses=1] 30 %tmp10 = call i32 (i8*, ...) @printf( i8* getelementptr ([4 x i8], [4 x i8]* @str, i32 0, i64 0), i32 %tmp.upgrd.3 ) ; <i32> [#uses=0] 31 %va.upgrd.4 = bitcast i8** %va to i8* ; <i8*> [#uses=1] 32 call void @llvm.va_end( i8* %va.upgrd.4 ) 33 ret void 34 35 ; The return sequence should pop the lr to r0-3, recover the stack space used to 36 ; store variadic argument registers, then return via r3. Possibly there is a pop 37 ; before this, but only if the function happened to use callee-saved registers. 38 ; CHECK: pop {[[POP_REG:r[0-3]]]} 39 ; CHECK: add sp, #[[IMM]] 40 ; CHECK: bx [[POP_REG]] 41 } 42 43 declare void @llvm.va_start(i8*) 44 45 declare i32 @printf(i8*, ...) 46 47 declare void @llvm.va_end(i8*) 48
