bjoernager/rust
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introduce and use ptradd/inbounds_ptradd instead of gep

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This commit is contained in:
Erik Desjardins 2024-02-24 02:01:41 -05:00
parent beed25be9a
commit 4724cd4dc4
6 changed files with 27 additions and 38 deletions
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38
compiler/rustc_codegen_llvm/src/va_arg.rs
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@ -44,12 +44,12 @@ fn emit_direct_ptr_va_arg<'ll, 'tcx>(
let aligned_size = size.align_to(slot_size).bytes() as i32;
let full_direct_size = bx.cx().const_i32(aligned_size);
let next = bx.inbounds_gep(bx.type_i8(), addr, &[full_direct_size]);
let next = bx.inbounds_ptradd(addr, full_direct_size);
bx.store(next, va_list_addr, bx.tcx().data_layout.pointer_align.abi);
if size.bytes() < slot_size.bytes() && bx.tcx().sess.target.endian == Endian::Big {
let adjusted_size = bx.cx().const_i32((slot_size.bytes() - size.bytes()) as i32);
let adjusted = bx.inbounds_gep(bx.type_i8(), addr, &[adjusted_size]);
let adjusted = bx.inbounds_ptradd(addr, adjusted_size);
(adjusted, addr_align)
} else {
(addr, addr_align)
@ -109,14 +109,10 @@ fn emit_aapcs_va_arg<'ll, 'tcx>(
// Table 3, Mapping of C & C++ built-in data types
let ptr_offset = 8;
let i32_offset = 4;
let gr_top = bx.inbounds_gep(bx.type_i8(), va_list_addr, &[bx.cx.const_usize(ptr_offset)]);
let vr_top = bx.inbounds_gep(bx.type_i8(), va_list_addr, &[bx.cx.const_usize(2 * ptr_offset)]);
let gr_offs = bx.inbounds_gep(bx.type_i8(), va_list_addr, &[bx.cx.const_usize(3 * ptr_offset)]);
let vr_offs = bx.inbounds_gep(
bx.type_i8(),
va_list_addr,
&[bx.cx.const_usize(3 * ptr_offset + i32_offset)],
);
let gr_top = bx.inbounds_ptradd(va_list_addr, bx.cx.const_usize(ptr_offset));
let vr_top = bx.inbounds_ptradd(va_list_addr, bx.cx.const_usize(2 * ptr_offset));
let gr_offs = bx.inbounds_ptradd(va_list_addr, bx.cx.const_usize(3 * ptr_offset));
let vr_offs = bx.inbounds_ptradd(va_list_addr, bx.cx.const_usize(3 * ptr_offset + i32_offset));
let layout = bx.cx.layout_of(target_ty);
@ -164,11 +160,11 @@ fn emit_aapcs_va_arg<'ll, 'tcx>(
let top = bx.load(top_type, reg_top, dl.pointer_align.abi);
// reg_value = *(@top + reg_off_v);
let mut reg_addr = bx.gep(bx.type_i8(), top, &[reg_off_v]);
let mut reg_addr = bx.ptradd(top, reg_off_v);
if bx.tcx().sess.target.endian == Endian::Big && layout.size.bytes() != slot_size {
// On big-endian systems the value is right-aligned in its slot.
let offset = bx.const_i32((slot_size - layout.size.bytes()) as i32);
reg_addr = bx.gep(bx.type_i8(), reg_addr, &[offset]);
reg_addr = bx.ptradd(reg_addr, offset);
}
let reg_type = layout.llvm_type(bx);
let reg_value = bx.load(reg_type, reg_addr, layout.align.abi);
@ -210,14 +206,10 @@ fn emit_s390x_va_arg<'ll, 'tcx>(
let i64_offset = 8;
let ptr_offset = 8;
let gpr = va_list_addr;
let fpr = bx.inbounds_gep(bx.type_i8(), va_list_addr, &[bx.cx.const_usize(i64_offset)]);
let overflow_arg_area =
bx.inbounds_gep(bx.type_i8(), va_list_addr, &[bx.cx.const_usize(2 * i64_offset)]);
let reg_save_area = bx.inbounds_gep(
bx.type_i8(),
va_list_addr,
&[bx.cx.const_usize(2 * i64_offset + ptr_offset)],
);
let fpr = bx.inbounds_ptradd(va_list_addr, bx.cx.const_usize(i64_offset));
let overflow_arg_area = bx.inbounds_ptradd(va_list_addr, bx.cx.const_usize(2 * i64_offset));
let reg_save_area =
bx.inbounds_ptradd(va_list_addr, bx.cx.const_usize(2 * i64_offset + ptr_offset));
let layout = bx.cx.layout_of(target_ty);
@ -248,7 +240,7 @@ fn emit_s390x_va_arg<'ll, 'tcx>(
let reg_ptr_v = bx.load(bx.type_ptr(), reg_save_area, dl.pointer_align.abi);
let scaled_reg_count = bx.mul(reg_count_v, bx.const_u64(8));
let reg_off = bx.add(scaled_reg_count, bx.const_u64(reg_save_index * 8 + reg_padding));
let reg_addr = bx.gep(bx.type_i8(), reg_ptr_v, &[reg_off]);
let reg_addr = bx.ptradd(reg_ptr_v, reg_off);
// Update the register count.
let new_reg_count_v = bx.add(reg_count_v, bx.const_u64(1));
@ -262,11 +254,11 @@ fn emit_s390x_va_arg<'ll, 'tcx>(
let arg_ptr_v =
bx.load(bx.type_ptr(), overflow_arg_area, bx.tcx().data_layout.pointer_align.abi);
let arg_off = bx.const_u64(padding);
let mem_addr = bx.gep(bx.type_i8(), arg_ptr_v, &[arg_off]);
let mem_addr = bx.ptradd(arg_ptr_v, arg_off);
// Update the argument overflow area pointer.
let arg_size = bx.cx().const_u64(padded_size);
let new_arg_ptr_v = bx.inbounds_gep(bx.type_i8(), arg_ptr_v, &[arg_size]);
let new_arg_ptr_v = bx.inbounds_ptradd(arg_ptr_v, arg_size);
bx.store(new_arg_ptr_v, overflow_arg_area, dl.pointer_align.abi);
bx.br(end);