http://llvm.org/bugs/show_bug.cgi?id=15504
Bug ID: 15504
Summary: Extra code generated in the presence of a large switch
Product: libraries
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: Backend: X86
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Created attachment 10175
--> http://llvm.org/bugs/attachment.cgi?id=10175&action=edit
reproducer
# clang test.c -S -O3 -o -
...
foo: # @foo
.cfi_startproc
# BB#0: # %entry
xorb %al, %al
testb %al, %al
je .LBB0_1
# BB#4: # %sw.epilog
ret
.LBB0_1: # %entry
movzbl (%rdi), %eax
jmpq *.LJTI0_0(,%rax,8)
.LBB0_2: # %sw.bb
jmp bar # TAILCALL
.LBB0_3: # %sw.bb1
jmp baz # TAILCALL
...
The part starting at "xorb %al, %al" does not seem to do anything useful.
"ret" at BB#4 is never taken.
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