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Account for return address when reserving stack space for CSRs.

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This commit is contained in:
Tyler McMullen
2017-12-04 17:19:27 -08:00
committed by Jakob Stoklund Olesen
parent a75248d2cf
commit 5783ea2c9a
2 changed files with 10 additions and 3 deletions
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9
lib/cretonne/src/isa/intel/abi.rs
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@@ -177,8 +177,15 @@ pub fn prologue_epilogue(func: &mut ir::Function, isa: &TargetIsa) -> result::Ct
ir::types::I32
};
let csrs = callee_saved_registers(isa.flags());
let csr_stack_size = ((csrs.len() + 1) * word_size as usize) as i32;
// The reserved stack area is composed of:
// return address + frame pointer + all callee-saved registers
//
// Pushing the return address is an implicit function of the `call`
// instruction. Each of the others we will then push explicitly. Then we
// will adjust the stack pointer to make room for the rest of the required
// space for this frame.
let csr_stack_size = ((csrs.len() + 2) * word_size as usize) as i32;
func.create_stack_slot(ir::StackSlotData {
kind: ir::StackSlotKind::IncomingArg,
size: csr_stack_size as u32,