73 lines
2.1 KiB
LLVM
73 lines
2.1 KiB
LLVM
; RUN: llc < %s -enable-shrink-wrap=true | FileCheck %s
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; chkstk cannot come before the usual prologue, since it adjusts ESP.
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; If chkstk is used in the prologue, we also have to be careful about preserving
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; EAX if it is used.
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target datalayout = "e-m:x-p:32:32-i64:64-f80:32-n8:16:32-a:0:32-S32"
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target triple = "i686-pc-windows-msvc18.0.0"
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%struct.S = type { [8192 x i8] }
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define x86_thiscallcc void @call_inalloca(i1 %x) {
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entry:
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%argmem = alloca inalloca <{ %struct.S }>, align 4
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%argidx1 = getelementptr inbounds <{ %struct.S }>, <{ %struct.S }>* %argmem, i32 0, i32 0, i32 0, i32 0
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%argidx2 = getelementptr inbounds <{ %struct.S }>, <{ %struct.S }>* %argmem, i32 0, i32 0, i32 0, i32 1
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store i8 42, i8* %argidx2, align 4
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br i1 %x, label %bb1, label %bb2
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bb1:
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store i8 42, i8* %argidx1, align 4
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br label %bb2
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bb2:
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call void @inalloca_params(<{ %struct.S }>* inalloca nonnull %argmem)
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ret void
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}
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; CHECK-LABEL: _call_inalloca: # @call_inalloca
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; CHECK: pushl %ebp
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; CHECK: movl %esp, %ebp
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; CHECK: movl $8192, %eax
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; CHECK: calll __chkstk
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; CHECK: calll _inalloca_params
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; CHECK: movl %ebp, %esp
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; CHECK: popl %ebp
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; CHECK: retl
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declare void @inalloca_params(<{ %struct.S }>* inalloca)
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declare i32 @doSomething(i32, i32*)
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; In this test case, we force usage of EAX before the prologue, and have to
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; compensate before calling __chkstk. It would also be valid for us to avoid
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; shrink wrapping in this case.
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define x86_fastcallcc i32 @use_eax_before_prologue(i32 inreg %a, i32 inreg %b) {
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%tmp = alloca i32, i32 1024, align 4
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%tmp2 = icmp slt i32 %a, %b
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br i1 %tmp2, label %true, label %false
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true:
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store i32 %a, i32* %tmp, align 4
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%tmp4 = call i32 @doSomething(i32 0, i32* %tmp)
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br label %false
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false:
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%tmp.0 = phi i32 [ %tmp4, %true ], [ %a, %0 ]
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ret i32 %tmp.0
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}
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; CHECK-LABEL: @use_eax_before_prologue@8: # @use_eax_before_prologue
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; CHECK: movl %ecx, %eax
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; CHECK: cmpl %edx, %eax
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; CHECK: jge LBB1_2
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; CHECK: pushl %eax
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; CHECK: movl $4092, %eax
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; CHECK: calll __chkstk
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; CHECK: movl 4092(%esp), %eax
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; CHECK: calll _doSomething
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; CHECK: LBB1_2:
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; CHECK: retl
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