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| author | Chris Lattner <sabre@nondot.org> | 2006-09-07 21:30:15 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2006-09-07 21:30:15 +0000 |
| commit | c465046e65aab434925142983c6e071d68730ffc (patch) | |
| tree | 6cc7c733db1738e2498f0ba08861a439dd949ce8 /llvm/lib/Transforms/Instrumentation | |
| parent | dc22b97b9a0a3ebbf6297a3ed8186beb4a3be0d4 (diff) | |
| download | bcm5719-llvm-c465046e65aab434925142983c6e071d68730ffc.tar.gz bcm5719-llvm-c465046e65aab434925142983c6e071d68730ffc.zip | |
Throttle back tail duplication to avoid creating really ugly sequences of code.
For Transforms/TailDup/if-tail-dup.ll, f.e., it produces:
_foo:
movl 8(%esp), %eax
movl 4(%esp), %ecx
testl $1, %ecx
je LBB1_2 #cond_next
LBB1_1: #cond_true
movl $1, (%eax)
LBB1_2: #cond_next
testl $2, %ecx
je LBB1_4 #cond_next10
LBB1_3: #cond_true6
movl $1, 4(%eax)
LBB1_4: #cond_next10
testl $4, %ecx
je LBB1_6 #cond_next18
LBB1_5: #cond_true14
movl $1, 8(%eax)
LBB1_6: #cond_next18
testl $8, %ecx
je LBB1_8 #return
LBB1_7: #cond_true22
movl $1, 12(%eax)
ret
LBB1_8: #return
ret
instead of:
_foo:
movl 4(%esp), %eax
testl $2, %eax
sete %cl
movl 8(%esp), %edx
testl $1, %eax
je LBB1_2 #cond_next
LBB1_1: #cond_true
movl $1, (%edx)
testb %cl, %cl
jne LBB1_4 #cond_next10
jmp LBB1_3 #cond_true6
LBB1_2: #cond_next
testb %cl, %cl
jne LBB1_4 #cond_next10
LBB1_3: #cond_true6
movl $1, 4(%edx)
testl $4, %eax
je LBB1_6 #cond_next18
jmp LBB1_5 #cond_true14
LBB1_4: #cond_next10
testl $4, %eax
je LBB1_6 #cond_next18
LBB1_5: #cond_true14
movl $1, 8(%edx)
testl $8, %eax
je LBB1_8 #return
jmp LBB1_7 #cond_true22
LBB1_6: #cond_next18
testl $8, %eax
je LBB1_8 #return
LBB1_7: #cond_true22
movl $1, 12(%edx)
ret
LBB1_8: #return
ret
llvm-svn: 30158
Diffstat (limited to 'llvm/lib/Transforms/Instrumentation')
0 files changed, 0 insertions, 0 deletions
