1 ; RUN: llc %s -o - -enable-shrink-wrap=true | FileCheck %s --check-prefix=CHECK --check-prefix=ENABLE
2 ; RUN: llc %s -o - -enable-shrink-wrap=false | FileCheck %s --check-prefix=CHECK --check-prefix=DISABLE
3 target datalayout = "e-m:e-p:32:32-f64:32:64-f80:32-n8:16:32-S128"
4 target triple = "i386-apple-macosx"
6 @a = common global i32 0, align 4
7 @d = internal unnamed_addr global i1 false
8 @b = common global i32 0, align 4
9 @e = common global i8 0, align 1
10 @f = common global i8 0, align 1
11 @c = common global i32 0, align 4
12 @.str = private unnamed_addr constant [4 x i8] c"%d\0A\00", align 1
15 ; Check that we are clobbering the flags when they are live-in of the
16 ; prologue block and the prologue needs to adjust the stack.
19 ; CHECK-LABEL: eflagsLiveInPrologue:
23 ; DISABLE-NEXT: subl $20, %esp
25 ; CHECK: movl L_a$non_lazy_ptr, [[A:%[a-z]+]]
26 ; CHECK-NEXT: cmpl $0, ([[A]])
27 ; CHECK-NEXT: je [[PREHEADER_LABEL:LBB[0-9_]+]]
31 ; CHECK: [[PREHEADER_LABEL]]:
32 ; CHECK-NEXT: movl L_b$non_lazy_ptr, [[B:%[a-z]+]]
33 ; CHECK-NEXT: movl ([[B]]), [[TMP1:%[a-z]+]]
34 ; CHECK-NEXT: testl [[TMP1]], [[TMP1]]
35 ; CHECK-NEXT: je [[FOREND_LABEL:LBB[0-9_]+]]
40 ; The for.end block is split to accomadate the different selects.
41 ; We are interested in the one with the call, so skip until the branch.
42 ; CHECK: [[FOREND_LABEL]]:
43 ; CHECK-NEXT: movb _d, [[D:%[a-z]+]]
45 ; CHECK: jne [[CALL_LABEL:LBB[0-9_]+]]
47 ; CHECK: movb $6, [[D]]
49 ; CHECK: [[CALL_LABEL]]
53 ; We must not use sub here otherwise we will clobber the eflags.
54 ; ENABLE-NEXT: leal -20(%esp), %esp
56 ; CHECK-NEXT: L_e$non_lazy_ptr, [[E:%[a-z]+]]
57 ; CHECK-NEXT: movb [[D]], ([[E]])
58 ; CHECK-NEXT: L_f$non_lazy_ptr, [[F:%[a-z]+]]
59 ; CHECK-NEXT: movsbl ([[F]]), [[CONV:%[a-z]+]]
60 ; CHECK-NEXT: movl $6, [[CONV:%[a-z]+]]
61 ; The eflags is used in the next instruction.
62 ; If that instruction disappear, we are not exercising the bug
64 ; CHECK-NEXT: cmovnel {{%[a-z]+}}, [[CONV]]
66 ; Skip all the crust of vaarg lowering.
67 ; CHECK: calll L_varfunc$stub
68 ; Set the return value to 0.
69 ; CHECK-NEXT: xorl %eax, %eax
70 ; CHECK-NEXT: addl $20, %esp
74 define i32 @eflagsLiveInPrologue() #0 {
76 %tmp = load i32, i32* @a, align 4
77 %tobool = icmp eq i32 %tmp, 0
78 br i1 %tobool, label %for.cond.preheader, label %if.then
80 if.then: ; preds = %entry
81 store i1 true, i1* @d, align 1
82 br label %for.cond.preheader
84 for.cond.preheader: ; preds = %if.then, %entry
85 %tmp1 = load i32, i32* @b, align 4
86 %tobool14 = icmp eq i32 %tmp1, 0
87 br i1 %tobool14, label %for.end, label %for.body.preheader
89 for.body.preheader: ; preds = %for.cond.preheader
92 for.body: ; preds = %for.body, %for.body.preheader
95 for.end: ; preds = %for.cond.preheader
96 %.b3 = load i1, i1* @d, align 1
97 %tmp2 = select i1 %.b3, i8 0, i8 6
98 store i8 %tmp2, i8* @e, align 1
99 %tmp3 = load i8, i8* @f, align 1
100 %conv = sext i8 %tmp3 to i32
101 %add = add nsw i32 %conv, 1
102 %rem = srem i32 %tmp1, %add
103 store i32 %rem, i32* @c, align 4
104 %conv2 = select i1 %.b3, i32 0, i32 6
105 %call = tail call i32 (i8*, ...) @varfunc(i8* nonnull getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i32 0, i32 0), i32 %conv2) #1
109 ; Function Attrs: nounwind
110 declare i32 @varfunc(i8* nocapture readonly, ...) #0
112 attributes #0 = { nounwind "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "target-features"="+mmx,+sse" "unsafe-fp-math"="false" "use-soft-float"="false" }
113 attributes #1 = { nounwind }