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6a7770b7ae
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. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@192750 91177308-0d34-0410-b5e6-96231b3b80d8
86 lines
2.8 KiB
LLVM
86 lines
2.8 KiB
LLVM
; RUN: llc < %s -tailcallopt -mtriple=x86_64-linux-gnu | FileCheck %s
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; Check the GHC call convention works (x86-64)
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@base = external global i64 ; assigned to register: R13
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@sp = external global i64 ; assigned to register: RBP
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@hp = external global i64 ; assigned to register: R12
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@r1 = external global i64 ; assigned to register: RBX
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@r2 = external global i64 ; assigned to register: R14
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@r3 = external global i64 ; assigned to register: RSI
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@r4 = external global i64 ; assigned to register: RDI
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@r5 = external global i64 ; assigned to register: R8
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@r6 = external global i64 ; assigned to register: R9
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@splim = external global i64 ; assigned to register: R15
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@f1 = external global float ; assigned to register: XMM1
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@f2 = external global float ; assigned to register: XMM2
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@f3 = external global float ; assigned to register: XMM3
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@f4 = external global float ; assigned to register: XMM4
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@d1 = external global double ; assigned to register: XMM5
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@d2 = external global double ; assigned to register: XMM6
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define void @zap(i64 %a, i64 %b) nounwind {
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entry:
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; CHECK: movq %rdi, %r13
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; CHECK-NEXT: movq %rsi, %rbp
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; CHECK-NEXT: callq addtwo
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%0 = call cc 10 i64 @addtwo(i64 %a, i64 %b)
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; CHECK: callq foo
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call void @foo() nounwind
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ret void
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}
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define cc 10 i64 @addtwo(i64 %x, i64 %y) nounwind {
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entry:
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; CHECK: leaq (%r13,%rbp), %rax
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%0 = add i64 %x, %y
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; CHECK-NEXT: ret
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ret i64 %0
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}
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define cc 10 void @foo() nounwind {
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entry:
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; CHECK: movsd d2(%rip), %xmm6
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; CHECK-NEXT: movsd d1(%rip), %xmm5
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; CHECK-NEXT: movss f4(%rip), %xmm4
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; CHECK-NEXT: movss f3(%rip), %xmm3
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; CHECK-NEXT: movss f2(%rip), %xmm2
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; CHECK-NEXT: movss f1(%rip), %xmm1
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; CHECK-NEXT: movq splim(%rip), %r15
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; CHECK-NEXT: movq r6(%rip), %r9
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; CHECK-NEXT: movq r5(%rip), %r8
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; CHECK-NEXT: movq r4(%rip), %rdi
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; CHECK-NEXT: movq r3(%rip), %rsi
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; CHECK-NEXT: movq r2(%rip), %r14
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; CHECK-NEXT: movq r1(%rip), %rbx
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; CHECK-NEXT: movq hp(%rip), %r12
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; CHECK-NEXT: movq sp(%rip), %rbp
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; CHECK-NEXT: movq base(%rip), %r13
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%0 = load double* @d2
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%1 = load double* @d1
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%2 = load float* @f4
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%3 = load float* @f3
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%4 = load float* @f2
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%5 = load float* @f1
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%6 = load i64* @splim
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%7 = load i64* @r6
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%8 = load i64* @r5
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%9 = load i64* @r4
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%10 = load i64* @r3
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%11 = load i64* @r2
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%12 = load i64* @r1
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%13 = load i64* @hp
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%14 = load i64* @sp
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%15 = load i64* @base
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; CHECK: jmp bar
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tail call cc 10 void @bar( i64 %15, i64 %14, i64 %13, i64 %12, i64 %11,
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i64 %10, i64 %9, i64 %8, i64 %7, i64 %6,
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float %5, float %4, float %3, float %2, double %1,
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double %0 ) nounwind
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ret void
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}
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declare cc 10 void @bar(i64, i64, i64, i64, i64, i64, i64, i64, i64, i64,
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float, float, float, float, double, double)
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