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[WebAssembly] Write stack pointer back to memory when FP is used

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The stack pointer is bumped when there is a frame pointer or when there
are static-size objects, but was only getting written back when there
were static-size objects.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@261453 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Derek Schuff 2016-02-20 22:18:47 +00:00
parent 37d3f7f35c
commit 545c0902d4
2 changed files with 5 additions and 2 deletions
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2
lib/Target/WebAssembly/WebAssemblyFrameLowering.cpp
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@ -125,7 +125,7 @@ void WebAssemblyFrameLowering::emitPrologue(MachineFunction &MF,
WebAssembly::FP32)
.addReg(WebAssembly::SP32);
}
if (StackSize) {
if (StackSize || hasFP(MF)) {
SPAddr = MRI.createVirtualRegister(&WebAssembly::I32RegClass);
// The SP32 register now has the new stacktop. Also write it back to memory.
BuildMI(MBB, InsertPt, DL, TII->get(WebAssembly::CONST_I32), SPAddr)

5
test/CodeGen/WebAssembly/userstack.ll
View File

@ -135,7 +135,8 @@ define void @dynamic_alloca(i32 %alloc) {
; CHECK-NEXT: i32.load [[SP:.+]]=, 0($pop[[L1]])
; CHECK-NEXT: copy_local [[FP:.+]]=, [[SP]]
; Target independent codegen bumps the stack pointer
; FIXME: we need to write the value back to memory
; CHECK: i32.const $push[[L4:.+]]=, __stack_pointer{{$}}
; CHECK-NEXT: i32.store [[SP]]=, 0($pop[[L4]]), [[SP]]
%r = alloca i32, i32 %alloc
; Target-independent codegen also calculates the store addr
store i32 0, i32* %r
@ -193,6 +194,8 @@ declare i8* @llvm.frameaddress(i32)
; CHECK: i32.const $push[[L1:.+]]=, __stack_pointer
; CHECK-NEXT: i32.load [[SP:.+]]=, 0($pop[[L1]])
; CHECK-NEXT: copy_local [[FP:.+]]=, [[SP]]
; CHECK-NEXT: i32.const $push[[L2:.+]]=, __stack_pointer{{$}}
; CHECK-NEXT: i32.store [[SP]]=, 0($pop[[L2]]), [[SP]]
; CHECK-NEXT: call use_i8_star@FUNCTION, [[FP]]
; CHECK-NEXT: i32.const $push[[L6:.+]]=, __stack_pointer
; CHECK-NEXT: i32.store [[SP]]=, 0($pop[[L6]]), [[FP]]