Add new code

Signed-off-by: Carlos Maiolino <[email protected]>

1 files changed, 43 insertions, 0 deletions

diff --git a/CSAPP/tmul.s b/CSAPP/tmul.s
new file mode 100644
index 0000000..52cee75
--- /dev/null
+++ b/CSAPP/tmul.s
@@ -0,0 +1,43 @@
+	.file	"tmul.c"
+	.text
+	.globl	tmul_ok_asm
+	.type	tmul_ok_asm, @function
+tmul_ok_asm:
+.LFB0:
+	.cfi_startproc
+	imulq	%rdi, %rsi
+	movq	%rsi, (%rdx)
+# Code deleted
+#	testq	%rsi, %rsi
+#	setg	%al
+# Code inserted
+	setae	%al
+# End of code inserted
+	movzbl	%al, %eax
+	ret
+	.cfi_endproc
+.LFE0:
+	.size	tmul_ok_asm, .-tmul_ok_asm
+	.globl	umul_ok_asm
+	.type	umul_ok_asm, @function
+umul_ok_asm:
+.LFB1:
+	.cfi_startproc
+	movq	%rdx, %rcx	#Save copy of dest
+	movq	%rsi, %rax	#copy y to %rax
+	mulq	%rdi		#unsigned multiplication
+	movq	%rax, (%rcx)	#copy result (low 64-bit) to dest
+	setae	%al		#Set low-order byt according to mulq
+# Code removed
+#	imulq	%rdi, %rsi
+#	movq	%rsi, (%rdx)
+#	testq	%rsi, %rsi
+#	setne	%al
+# End of code removed
+	movzbl	%al, %eax
+	ret
+	.cfi_endproc
+.LFE1:
+	.size	umul_ok_asm, .-umul_ok_asm
+	.ident	"GCC: (GNU) 5.3.1 20160406 (Red Hat 5.3.1-6)"
+	.section	.note.GNU-stack,"",@progbits