Chris Lattner e0391beda8 Fix a FIXME: if we are inserting code for a PHI argument, split the critical ... edge so that the code is not always executed for both operands. This prevents LSR from inserting code into loops whose exit blocks contain PHI uses of IV expressions (which are outside of loops). On gzip, for example, we turn this ugly code: .LBB_test_1: ; loopentry add r27, r3, r28 lhz r27, 3(r27) add r26, r4, r28 lhz r26, 3(r26) add r25, r30, r28 ;; Only live if exiting the loop add r24, r29, r28 ;; Only live if exiting the loop cmpw cr0, r27, r26 bne .LBB_test_5 ; loopexit into this: .LBB_test_1: ; loopentry or r27, r28, r28 add r28, r3, r27 lhz r28, 3(r28) add r26, r4, r27 lhz r26, 3(r26) cmpw cr0, r28, r26 beq .LBB_test_3 ; shortcirc_next.0 .LBB_test_2: ; loopentry.loopexit_crit_edge add r2, r30, r27 add r8, r29, r27 b .LBB_test_9 ; loopexit .LBB_test_2: ; shortcirc_next.0 ... blt .LBB_test_1 into this: .LBB_test_1: ; loopentry or r27, r28, r28 add r28, r3, r27 lhz r28, 3(r28) add r26, r4, r27 lhz r26, 3(r26) cmpw cr0, r28, r26 beq .LBB_test_3 ; shortcirc_next.0 .LBB_test_2: ; loopentry.loopexit_crit_edge add r2, r30, r27 add r8, r29, r27 b .LBB_t_3: ; shortcirc_next.0 .LBB_test_3: ; shortcirc_next.0 ... blt .LBB_test_1 Next step: get the block out of the loop so that the loop is all fall-throughs again. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22766 91177308-0d34-0410-b5e6-96231b3b80d8		2005-08-12 22:06:11 +00:00
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Analysis	Fix an obvious oops	2005-08-10 00:59:40 +00:00
Archive	Final Changes For PR495:	2005-07-08 03:08:58 +00:00
AsmParser	Fix grammar	2005-06-24 18:00:40 +00:00
Bytecode	Eliminate all remaining tabs and trailing spaces.	2005-07-27 06:12:32 +00:00
CodeGen	Add a select_cc optimization for recognizing abs(int). This speeds up an	2005-08-11 02:18:13 +00:00
Debugger	For PR495:	2005-07-07 23:21:43 +00:00
ExecutionEngine	one cannot allocate a global, until one is done initializing the global pointers	2005-08-01 17:35:40 +00:00
Linker	For PR495:	2005-07-07 23:21:43 +00:00
Support	Allow tools with "consume after" options (like lli) to take more positional	2005-08-08 21:57:27 +00:00
System	Fix grammar: it's == "it is".	2005-08-02 16:04:59 +00:00
Target	match gcc's use of tabs, makes diffs easier	2005-08-12 16:14:08 +00:00
Transforms	Fix a FIXME: if we are inserting code for a PHI argument, split the critical	2005-08-12 22:06:11 +00:00
VMCore	add new helper function	2005-08-08 05:21:50 +00:00
Makefile	Add the Linker library	2004-11-14 21:54:41 +00:00