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| author | Kartik Agaram <vc@akkartik.com> | 2020-09-30 22:50:26 -0700 |
|---|---|---|
| committer | Kartik Agaram <vc@akkartik.com> | 2020-09-30 22:53:14 -0700 |
| commit | 656b840e7f5ee0eff08729146c4fc797c63968e1 (patch) | |
| tree | acea188c1be9794879f10c7e37e28c98061a4e78 /018jump_disp32.cc | |
| parent | d564633b240cfc0e8bfe49098a6ac49abf688a76 (diff) | |
| download | mu-656b840e7f5ee0eff08729146c4fc797c63968e1.tar.gz | |
6911 - comparing floats
It turns out floating-point operations set different flags than most instructions. We have to branch on them using unsigned jumps. https://stackoverflow.com/questions/7057501/x86-assembler-floating-point-compare/7057771#7057771
Diffstat (limited to '018jump_disp32.cc')
| -rw-r--r-- | 018jump_disp32.cc | 16 |
1 files changed, 8 insertions, 8 deletions
diff --git a/018jump_disp32.cc b/018jump_disp32.cc index 4166fb60..e77bc584 100644 --- a/018jump_disp32.cc +++ b/018jump_disp32.cc @@ -135,8 +135,8 @@ void test_jne_disp32_fail() { //:: jump if greater :(before "End Initialize Op Names") -put_new(Name_0f, "8f", "jump disp32 bytes away if greater (signed), if ZF is unset and SF == OF (jcc/jg/jnle)"); -put_new(Name_0f, "87", "jump disp32 bytes away if greater (unsigned), if ZF is unset and CF is unset (jcc/ja/jnbe)"); +put_new(Name_0f, "8f", "jump disp32 bytes away if greater, if ZF is unset and SF == OF (jcc/jg/jnle)"); +put_new(Name_0f, "87", "jump disp32 bytes away if greater (addr, float), if ZF is unset and CF is unset (jcc/ja/jnbe)"); :(code) void test_jg_disp32_success() { @@ -199,8 +199,8 @@ void test_jg_disp32_fail() { //:: jump if greater or equal :(before "End Initialize Op Names") -put_new(Name_0f, "8d", "jump disp32 bytes away if greater or equal (signed), if SF == OF (jcc/jge/jnl)"); -put_new(Name_0f, "83", "jump disp32 bytes away if greater or equal (unsigned), if CF is unset (jcc/jae/jnb)"); +put_new(Name_0f, "8d", "jump disp32 bytes away if greater or equal, if SF == OF (jcc/jge/jnl)"); +put_new(Name_0f, "83", "jump disp32 bytes away if greater or equal (addr, float), if CF is unset (jcc/jae/jnb)"); :(code) void test_jge_disp32_success() { @@ -261,8 +261,8 @@ void test_jge_disp32_fail() { //:: jump if lesser :(before "End Initialize Op Names") -put_new(Name_0f, "8c", "jump disp32 bytes away if lesser (signed), if SF != OF (jcc/jl/jnge)"); -put_new(Name_0f, "82", "jump disp32 bytes away if lesser (unsigned), if CF is set (jcc/jb/jnae)"); +put_new(Name_0f, "8c", "jump disp32 bytes away if lesser, if SF != OF (jcc/jl/jnge)"); +put_new(Name_0f, "82", "jump disp32 bytes away if lesser (addr, float), if CF is set (jcc/jb/jnae)"); :(code) void test_jl_disp32_success() { @@ -325,8 +325,8 @@ void test_jl_disp32_fail() { //:: jump if lesser or equal :(before "End Initialize Op Names") -put_new(Name_0f, "8e", "jump disp32 bytes away if lesser or equal (signed), if ZF is set or SF != OF (jcc/jle/jng)"); -put_new(Name_0f, "86", "jump disp32 bytes away if lesser or equal (unsigned), if ZF is set or CF is set (jcc/jbe/jna)"); +put_new(Name_0f, "8e", "jump disp32 bytes away if lesser or equal, if ZF is set or SF != OF (jcc/jle/jng)"); +put_new(Name_0f, "86", "jump disp32 bytes away if lesser or equal (addr, float), if ZF is set or CF is set (jcc/jbe/jna)"); :(code) void test_jle_disp32_equal() { |