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machinst x64: fix encoding of movzx/movsx with non-ABCD input registers;

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Using an input register that doesn't belong to the ABCD family (al,
etc.) as the source of movsx/movzx requires a redundant REX prefix, that
was not emitted.
This commit is contained in:
Benjamin Bouvier
2020-07-23 14:12:12 +02:00
parent de4923356a
commit 2e3ad3227d
2 changed files with 55 additions and 20 deletions
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10
cranelift/codegen/src/isa/x64/inst/emit_tests.rs
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@@ -1401,6 +1401,11 @@ fn test_x64_emit() {
// ========================================================
// MovZX_RM_R
insns.push((
Inst::movzx_rm_r(ExtMode::BL, RegMem::reg(rdi), w_rdi, None),
"400FB6FF",
"movzbl %dil, %edi",
));
insns.push((
Inst::movzx_rm_r(ExtMode::BL, RegMem::reg(rax), w_rsi, None),
"0FB6F0",
@@ -1723,6 +1728,11 @@ fn test_x64_emit() {
// ========================================================
// MovSX_RM_R
insns.push((
Inst::movsx_rm_r(ExtMode::BL, RegMem::reg(rdi), w_rdi, None),
"400FBEFF",
"movsbl %dil, %edi",
));
insns.push((
Inst::movsx_rm_r(ExtMode::BL, RegMem::reg(rcx), w_rsi, None),
"0FBEF1",