bt/bts: bit op is mod 32

evmar · Sep 15, 2024 · 6427aed · 6427aed
1 parent 2576aeb
commit 6427aed
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Showing 2 changed files with 2 additions and 2 deletions.
diff --git a/x86/src/ops/basic.rs b/x86/src/ops/basic.rs
@@ -473,7 +473,7 @@ pub fn xlat_m8(cpu: &mut CPU, mem: Mem, _instr: &Instruction) {
 }
 
 pub fn bts_rm32_r32(cpu: &mut CPU, mem: Mem, instr: &Instruction) {
-    let y = op1_rm32(cpu, mem, instr);
+    let y = op1_rm32(cpu, mem, instr) % 32;
     let x = rm32(cpu, mem, instr);
     let mask = 1u32 << y;
     cpu.flags.set(Flags::CF, x.get() & mask != 0);

diff --git a/x86/src/ops/test.rs b/x86/src/ops/test.rs
@@ -107,7 +107,7 @@ pub fn test_rm8_imm8(cpu: &mut CPU, mem: Mem, instr: &Instruction) {
 
 pub fn bt_rm32_r32(cpu: &mut CPU, mem: Mem, instr: &Instruction) {
     let x = rm32(cpu, mem, instr).get();
-    let y = op1_rm32(cpu, mem, instr);
+    let y = op1_rm32(cpu, mem, instr) % 32;
     cpu.flags.set(Flags::CF, ((x >> y) & 1) != 0);
 }