3rd-party/linux-kernel-module-cheat
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x86 asm: improve jcc

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Ciro Santilli 六四事件 法轮功
2019-06-15 00:00:01 +00:00
parent 58418b2a8d
commit 89a7cf0936
2 changed files with 6 additions and 3 deletions
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5
README.adoc
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@@ -11780,6 +11780,9 @@ The first examples you should look into are:
** <<x86-addressing-modes>> ** <<x86-addressing-modes>>
** <<arm-addressing-modes>> ** <<arm-addressing-modes>>
* registers: <<assembly-registers>> * registers: <<assembly-registers>>
* jumping:
** <<x86-control-transfer-instructions>>
** <<arm-branch-instructions>>
* SIMD * SIMD
** <<x86-simd>> ** <<x86-simd>>
** <<arm-simd>> ** <<arm-simd>>
@@ -12404,8 +12407,8 @@ Jcc includes the instructions:
JG vs JA and JL vs JB: JG vs JA and JL vs JB:
* https://stackoverflow.com/questions/9617877/assembly-jg-jnle-jl-jnge-after-cmp/56613928#56613928
* https://stackoverflow.com/questions/20906639/difference-between-ja-and-jg-in-assembly * https://stackoverflow.com/questions/20906639/difference-between-ja-and-jg-in-assembly
* https://stackoverflow.com/questions/9617877/assembly-jg-jnle-jl-jnge-after-cmp
=== x86 SIMD === x86 SIMD

4
userland/arch/x86_64/jcc.S
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@@ -44,12 +44,12 @@ LKMC_PROLOGUE
popf popf
pushf pushf
/* ! 0 > 255 */ /* !(0 > 255) */
LKMC_ASSERT(jna) LKMC_ASSERT(jna)
popf popf
pushf pushf
/* ! 0 < -1 */ /* !(0 < -1) */
LKMC_ASSERT(jnl) LKMC_ASSERT(jnl)
popf popf
pushf pushf