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e3e67d4a0a
This changes the SelectionDAG scheduling preference to source order. Soon, the SelectionDAG scheduler can be bypassed saving a nice chunk of compile time. Performance differences that result from this change are often a consequence of register coalescing. The register coalescer is far from perfect. Bugs can be filed for deficiencies. On x86 SandyBridge/Haswell, the source order schedule is often preserved, particularly for small blocks. Register pressure is generally improved over the SD scheduler's ILP mode. However, we are still able to handle large blocks that require latency hiding, unlike the SD scheduler's BURR mode. MI scheduler also attempts to discover the critical path in single-block loops and adjust heuristics accordingly. The MI scheduler relies on the new machine model. This is currently unimplemented for AVX, so we may not be generating the best code yet. Unit tests are updated so they don't depend on SD scheduling heuristics. llvm-svn: 192750
54 lines
2.1 KiB
LLVM
54 lines
2.1 KiB
LLVM
; RUN: llc -mcpu=generic -mtriple=i386-apple-darwin -tailcallopt -enable-misched=false < %s | FileCheck %s
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; Check that lowered argumens do not overwrite the return address before it is moved.
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; Bug 6225
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;
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; If a call is a fastcc tail call and tail call optimization is enabled, the
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; caller frame is replaced by the callee frame. This can require that arguments are
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; placed on the former return address stack slot. Special care needs to be taken
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; taken that the return address is moved / or stored in a register before
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; lowering of arguments potentially overwrites the value.
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;
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; Move return address (76(%esp)) to a temporary register (%ebp)
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; CHECK: movl 76(%esp), [[REGISTER:%[a-z]+]]
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; Overwrite return addresss
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; CHECK: movl [[EBX:%[a-z]+]], 76(%esp)
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; Move return address from temporary register (%ebp) to new stack location (60(%esp))
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; CHECK: movl [[REGISTER]], 60(%esp)
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%tupl_p = type [9 x i32]*
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declare fastcc void @l297(i32 %r10, i32 %r9, i32 %r8, i32 %r7, i32 %r6, i32 %r5, i32 %r3, i32 %r2) noreturn nounwind
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declare fastcc void @l298(i32 %r10, i32 %r9, i32 %r4) noreturn nounwind
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define fastcc void @l186(%tupl_p %r1) noreturn nounwind {
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entry:
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%ptr1 = getelementptr %tupl_p %r1, i32 0, i32 0
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%r2 = load i32* %ptr1
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%ptr3 = getelementptr %tupl_p %r1, i32 0, i32 1
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%r3 = load i32* %ptr3
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%ptr5 = getelementptr %tupl_p %r1, i32 0, i32 2
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%r4 = load i32* %ptr5
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%ptr7 = getelementptr %tupl_p %r1, i32 0, i32 3
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%r5 = load i32* %ptr7
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%ptr9 = getelementptr %tupl_p %r1, i32 0, i32 4
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%r6 = load i32* %ptr9
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%ptr11 = getelementptr %tupl_p %r1, i32 0, i32 5
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%r7 = load i32* %ptr11
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%ptr13 = getelementptr %tupl_p %r1, i32 0, i32 6
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%r8 = load i32* %ptr13
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%ptr15 = getelementptr %tupl_p %r1, i32 0, i32 7
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%r9 = load i32* %ptr15
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%ptr17 = getelementptr %tupl_p %r1, i32 0, i32 8
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%r10 = load i32* %ptr17
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%cond = icmp eq i32 %r10, 3
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br i1 %cond, label %true, label %false
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true:
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tail call fastcc void @l297(i32 %r10, i32 %r9, i32 %r8, i32 %r7, i32 %r6, i32 %r5, i32 %r3, i32 %r2) noreturn nounwind
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ret void
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false:
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tail call fastcc void @l298(i32 %r10, i32 %r9, i32 %r4) noreturn nounwind
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ret void
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}
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