http://llvm.org/bugs/show_bug.cgi?id=9784
Summary: Inefficient encoding of cmp/test with immediate
argument and dead register
Product: libraries
Version: trunk
Platform: PC
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P
Component: Backend: X86
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
64bit mode:
cmpl $0xffffffff, %eax # 3 Bytes
incl %eax # 2 Bytes
cmpl $1, %eax # 3 Bytes
decl %eax # 2 Byes
cmpl $128, %eax # 5 Bytes
addl $-128, %eax # 3 Bytes
cmpq $-1, %rax # 4 Bytes
incq %rax # 3 Bytes
cmpq $1, %rax # 4 Bytes
decq %rax # 3 Bytes
cmpq $128, %rax # 6 Bytes
addq $-128, %rax # 4 Bytes
cmpw $-1, %ax # 4 Bytes
incw %ax # 3 Bytes
cmpw $1, %ax # 4 Bytes
decw %ax # 3 Bytes
testl $-1, %eax # 5 Bytes
andl $-1, %eax # 3 Bytes
testq $-1, %rax # 6 Bytes
andq $-1, %rax # 4 Bytes
32bit mode:
cmpl $0xffffffff, %eax # 3 Bytes
incl %eax # 1 Bytes
cmpl $1, %eax # 3 Bytes
decl %eax # 1 Byes
cmpl $128, %eax # 5 Bytes
addl $-128, %eax # 3 Bytes
cmpw $-1, %ax # 4 Bytes
incw %ax # 2 Bytes
cmpw $1, %ax # 4 Bytes
decw %ax # 2 Bytes
testl $0xffffffff, %eax # 5 Bytes
andl $-1, %eax # 3 Bytes
--
Configure bugmail: http://llvm.org/bugs/userprefs.cgi?tab=email
------- You are receiving this mail because: -------
You are on the CC list for the bug.
_______________________________________________
LLVMbugs mailing list
[email protected]
http://lists.cs.uiuc.edu/mailman/listinfo/llvmbugs
