Chris Lattner 571e434a34 Turn conditions like x<Y|z==q into multiple blocks. ... This compiles Regression/CodeGen/X86/or-branch.ll into: _foo: subl $12, %esp call L_bar$stub movl 20(%esp), %eax movl 16(%esp), %ecx cmpl $5, %eax jl LBB1_1 #cond_true LBB1_3: #entry testl %ecx, %ecx jne LBB1_2 #UnifiedReturnBlock LBB1_1: #cond_true call L_bar$stub addl $12, %esp ret LBB1_2: #UnifiedReturnBlock addl $12, %esp ret instead of: _foo: subl $12, %esp call L_bar$stub movl 20(%esp), %eax movl 16(%esp), %ecx cmpl $4, %eax setg %al testl %ecx, %ecx setne %cl testb %cl, %al jne LBB1_2 #UnifiedReturnBlock LBB1_1: #cond_true call L_bar$stub addl $12, %esp ret LBB1_2: #UnifiedReturnBlock addl $12, %esp ret And on ppc to: cmpwi cr0, r29, 5 blt cr0, LBB1_1 ;cond_true LBB1_3: ;entry cmplwi cr0, r30, 0 bne cr0, LBB1_2 ;UnifiedReturnBlock instead of: cmpwi cr7, r4, 4 mfcr r2 addic r4, r3, -1 subfe r30, r4, r3 rlwinm r29, r2, 30, 31, 31 and r2, r29, r30 cmplwi cr0, r2, 0 bne cr0, LBB1_2 ;UnifiedReturnBlock git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@31230 91177308-0d34-0410-b5e6-96231b3b80d8		2006-10-27 21:36:01 +00:00
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llvm	Turn conditions like x<Y|z==q into multiple blocks.	2006-10-27 21:36:01 +00:00