114 lines
3.9 KiB
LLVM
114 lines
3.9 KiB
LLVM
; RUN: llc %s -o - -enable-shrink-wrap=true -no-x86-call-frame-opt | FileCheck %s --check-prefix=CHECK --check-prefix=ENABLE
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; RUN: llc %s -o - -enable-shrink-wrap=false -no-x86-call-frame-opt | FileCheck %s --check-prefix=CHECK --check-prefix=DISABLE
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target datalayout = "e-m:e-p:32:32-f64:32:64-f80:32-n8:16:32-S128"
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target triple = "i386-apple-macosx10.5"
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@a = common global i32 0, align 4
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@d = internal unnamed_addr global i1 false
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@b = common global i32 0, align 4
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@e = common global i8 0, align 1
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@f = common global i8 0, align 1
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@c = common global i32 0, align 4
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@.str = private unnamed_addr constant [4 x i8] c"%d\0A\00", align 1
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; Check that we are clobbering the flags when they are live-in of the
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; prologue block and the prologue needs to adjust the stack.
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; PR25607.
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;
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; CHECK-LABEL: eflagsLiveInPrologue:
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;
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; DISABLE: pushl
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; DISABLE-NEXT: pushl
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; DISABLE-NEXT: subl $20, %esp
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;
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; CHECK: movl L_a$non_lazy_ptr, [[A:%[a-z]+]]
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; CHECK-NEXT: cmpl $0, ([[A]])
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; CHECK-NEXT: je [[PREHEADER_LABEL:LBB[0-9_]+]]
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;
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; CHECK: movb $1, _d
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;
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; CHECK: [[PREHEADER_LABEL]]:
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; CHECK-NEXT: movl L_b$non_lazy_ptr, [[B:%[a-z]+]]
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; CHECK-NEXT: movl ([[B]]), [[TMP1:%[a-z]+]]
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; CHECK-NEXT: testl [[TMP1]], [[TMP1]]
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; CHECK-NEXT: je [[FOREND_LABEL:LBB[0-9_]+]]
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;
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; Skip the loop.
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; [...]
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;
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; The for.end block is split to accomadate the different selects.
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; We are interested in the one with the call, so skip until the branch.
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; CHECK: [[FOREND_LABEL]]:
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; CHECK-NEXT: movb _d, [[D:%[a-z]+]]
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; [...]
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; CHECK: jne [[CALL_LABEL:LBB[0-9_]+]]
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;
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; CHECK: movb $6, [[D]]
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;
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; CHECK: [[CALL_LABEL]]
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;
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; ENABLE-NEXT: pushl
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; ENABLE-NEXT: pushl
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; We must not use sub here otherwise we will clobber the eflags.
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; ENABLE-NEXT: leal -20(%esp), %esp
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;
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; CHECK-NEXT: L_e$non_lazy_ptr, [[E:%[a-z]+]]
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; CHECK-NEXT: movb [[D]], ([[E]])
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; CHECK-NEXT: L_f$non_lazy_ptr, [[F:%[a-z]+]]
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; CHECK-NEXT: movsbl ([[F]]), [[CONV:%[a-z]+]]
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; CHECK-NEXT: movl $6, [[CONV:%[a-z]+]]
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; The eflags is used in the next instruction.
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; If that instruction disappear, we are not exercising the bug
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; anymore.
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; CHECK-NEXT: cmovnel {{%[a-z]+}}, [[CONV]]
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;
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; Skip all the crust of vaarg lowering.
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; CHECK: calll _varfunc
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; Set the return value to 0.
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; CHECK-NEXT: xorl %eax, %eax
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; CHECK-NEXT: addl $20, %esp
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; CHECK-NEXT: popl
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; CHECK-NEXT: popl
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; CHECK-NEXT: retl
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define i32 @eflagsLiveInPrologue() #0 {
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entry:
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%tmp = load i32, i32* @a, align 4
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%tobool = icmp eq i32 %tmp, 0
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br i1 %tobool, label %for.cond.preheader, label %if.then
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if.then: ; preds = %entry
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store i1 true, i1* @d, align 1
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br label %for.cond.preheader
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for.cond.preheader: ; preds = %if.then, %entry
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%tmp1 = load i32, i32* @b, align 4
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%tobool14 = icmp eq i32 %tmp1, 0
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br i1 %tobool14, label %for.end, label %for.body.preheader
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for.body.preheader: ; preds = %for.cond.preheader
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br label %for.body
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for.body: ; preds = %for.body, %for.body.preheader
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br label %for.body
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for.end: ; preds = %for.cond.preheader
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%.b3 = load i1, i1* @d, align 1
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%tmp2 = select i1 %.b3, i8 0, i8 6
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store i8 %tmp2, i8* @e, align 1
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%tmp3 = load i8, i8* @f, align 1
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%conv = sext i8 %tmp3 to i32
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%add = add nsw i32 %conv, 1
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%rem = srem i32 %tmp1, %add
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store i32 %rem, i32* @c, align 4
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%conv2 = select i1 %.b3, i32 0, i32 6
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%call = tail call i32 (i8*, ...) @varfunc(i8* nonnull getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i32 0, i32 0), i32 %conv2) #1
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ret i32 0
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}
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; Function Attrs: nounwind
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declare i32 @varfunc(i8* nocapture readonly, ...) #0
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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" }
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attributes #1 = { nounwind }
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