From b3747706fc0ccece33516b257f6601508c3a2a45 Mon Sep 17 00:00:00 2001 From: Bill Wendling Date: Sun, 31 Oct 2010 22:07:12 +0000 Subject: Disable the peephole optimizer until 186.crafty on armv6 is fixed. This is what looks like is happening: Without the peephole optimizer: (1) sub r6, r6, #32 orr r12, r12, lr, lsl r9 orr r2, r2, r3, lsl r10 (x) cmp r6, #0 ldr r9, LCPI2_10 ldr r10, LCPI2_11 (2) sub r8, r8, #32 (a) movge r12, lr, lsr r6 (y) cmp r8, #0 LPC2_10: ldr lr, [pc, r10] (b) movge r2, r3, lsr r8 With the peephole optimizer: ldr r9, LCPI2_10 ldr r10, LCPI2_11 (1*) subs r6, r6, #32 (2*) subs r8, r8, #32 (a*) movge r12, lr, lsr r6 (b*) movge r2, r3, lsr r8 (1) is used by (x) for the conditional move at (a). (2) is used by (y) for the conditional move at (b). After the peephole optimizer, these the flags resulting from (1*) are ignored and only the flags from (2*) are considered for both conditional moves. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@117876 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/CodeGen/PeepholeOptimizer.cpp | 2 ++ 1 file changed, 2 insertions(+) (limited to 'lib/CodeGen/PeepholeOptimizer.cpp') diff --git a/lib/CodeGen/PeepholeOptimizer.cpp b/lib/CodeGen/PeepholeOptimizer.cpp index 210f8866df..e27ea153d1 100644 --- a/lib/CodeGen/PeepholeOptimizer.cpp +++ b/lib/CodeGen/PeepholeOptimizer.cpp @@ -276,9 +276,11 @@ bool PeepholeOptimizer::runOnMachineFunction(MachineFunction &MF) { if (MI->getDesc().isCompare() && !MI->getDesc().hasUnmodeledSideEffects()) { +#if 0 if (OptimizeCmpInstr(MI, MBB, MII)) Changed = true; else +#endif ++MII; } else { Changed |= OptimizeExtInstr(MI, MBB, LocalMIs); -- cgit v1.2.3-18-g5258