1 files changed, 34 insertions, 0 deletions
diff --git a/zap/source/amd64/math/abs.s b/zap/source/amd64/math/abs.s
new file mode 100644
index 0000000..178b5a7
--- /dev/null
+++ b/zap/source/amd64/math/abs.s
@@ -0,0 +1,34 @@
+# Copyright 2022-2023 Gabriel Jensen.
+# This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0.
+# If a copy of the MPL was not distributed with this file, You can obtain one at <https://mozilla.org/MPL/2.0>.
+
+.intel_syntax noprefix
+
+.globl zap_abs8
+.globl zap_abs01
+.globl zap_abs02
+.globl zap_abs04
+
+zap_abs8:
+	mov   al,dil
+	neg   al     # zap_i8 ret = -inv;        // Invert the copy of the input value. This also tests the sign of the value.
+	cmovs ax,di  # if (val < 0x0) ret = val; // If it was positive, just return the unmodified input.
+	ret          # return ret;
+
+zap_abs01:
+	mov   ax,di
+	neg   ax
+	cmovs ax,di
+	ret
+
+zap_abs02:
+	mov   eax,edi
+	neg   eax
+	cmovs eax,edi
+	ret
+
+zap_abs04:
+	mov   rax,rdi
+	neg   rax
+	cmovs rax,rdi
+	ret