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Avoid aliasing reg128 structs (fixes pshuf*)

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This commit is contained in:
Fabian 2020-12-31 19:14:31 -06:00
parent 1ff541997d
commit 584c1e93ac
2 changed files with 26 additions and 4 deletions
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16
src/rust/codegen.rs
View file

@ -233,6 +233,22 @@ pub fn decr_exc_asize(ctx: &mut JitContext) {
}
}
pub fn gen_read_reg_xmm128_into_scratch(ctx: &mut JitContext, r: u32) {
ctx.builder
.const_i32(global_pointers::SSE_SCRATCH_REGISTER as i32);
let dest = global_pointers::get_reg_xmm_low_offset(r);
ctx.builder.const_i32(dest as i32);
ctx.builder.load_aligned_i64(0);
ctx.builder.store_aligned_i64(0);
ctx.builder
.const_i32(global_pointers::SSE_SCRATCH_REGISTER as i32 + 8);
let dest = global_pointers::get_reg_xmm_low_offset(r) + 8;
ctx.builder.const_i32(dest as i32);
ctx.builder.load_aligned_i64(0);
ctx.builder.store_aligned_i64(0);
}
pub fn gen_get_sreg(ctx: &mut JitContext, r: u32) {
ctx.builder
.load_fixed_u16(global_pointers::get_sreg_offset(r))

14
src/rust/jit_instructions.rs
View file

@ -110,7 +110,10 @@ pub fn sse_read128_xmm_mem(ctx: &mut JitContext, name: &str, modrm_byte: ModrmBy
ctx.builder.call_fn2(name);
}
pub fn sse_read128_xmm_xmm(ctx: &mut JitContext, name: &str, r1: u32, r2: u32) {
let dest = global_pointers::get_reg_xmm_low_offset(r1);
// Make a copy to avoid aliasing problems: Called function expects a reg128, which must not
// alias with memory
codegen::gen_read_reg_xmm128_into_scratch(ctx, r1);
let dest = global_pointers::SSE_SCRATCH_REGISTER;
ctx.builder.const_i32(dest as i32);
ctx.builder.const_i32(r2 as i32);
ctx.builder.call_fn2(name);
@ -4472,7 +4475,8 @@ pub fn instr_660F70_mem_jit(ctx: &mut JitContext, modrm_byte: ModrmByte, r: u32,
ctx.builder.call_fn3("instr_660F70");
}
pub fn instr_660F70_reg_jit(ctx: &mut JitContext, r1: u32, r2: u32, imm8: u32) {
let dest = global_pointers::get_reg_xmm_low_offset(r1);
codegen::gen_read_reg_xmm128_into_scratch(ctx, r1);
let dest = global_pointers::SSE_SCRATCH_REGISTER;
ctx.builder.const_i32(dest as i32);
ctx.builder.const_i32(r2 as i32);
ctx.builder.const_i32(imm8 as i32);
@ -4487,7 +4491,8 @@ pub fn instr_F20F70_mem_jit(ctx: &mut JitContext, modrm_byte: ModrmByte, r: u32,
ctx.builder.call_fn3("instr_F20F70");
}
pub fn instr_F20F70_reg_jit(ctx: &mut JitContext, r1: u32, r2: u32, imm8: u32) {
let dest = global_pointers::get_reg_xmm_low_offset(r1);
codegen::gen_read_reg_xmm128_into_scratch(ctx, r1);
let dest = global_pointers::SSE_SCRATCH_REGISTER;
ctx.builder.const_i32(dest as i32);
ctx.builder.const_i32(r2 as i32);
ctx.builder.const_i32(imm8 as i32);
@ -4502,7 +4507,8 @@ pub fn instr_F30F70_mem_jit(ctx: &mut JitContext, modrm_byte: ModrmByte, r: u32,
ctx.builder.call_fn3("instr_F30F70");
}
pub fn instr_F30F70_reg_jit(ctx: &mut JitContext, r1: u32, r2: u32, imm8: u32) {
let dest = global_pointers::get_reg_xmm_low_offset(r1);
codegen::gen_read_reg_xmm128_into_scratch(ctx, r1);
let dest = global_pointers::SSE_SCRATCH_REGISTER;
ctx.builder.const_i32(dest as i32);
ctx.builder.const_i32(r2 as i32);
ctx.builder.const_i32(imm8 as i32);