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277138a332
This is causing compilation timeouts on code with long sequences of local values and calls (i.e. foo(1); foo(2); foo(3); ...). It turns out that code coverage instrumentation is a great way to create sequences like this, which how our users ran into the issue in practice. Intel has a tool that detects these kinds of non-linear compile time issues, and Andy Kaylor reported it as PR37010. The current sinking code scans the whole basic block once per local value sink, which happens before emitting each call. In theory, local values should only be introduced to be used by instructions between the current flush point and the last flush point, so we should only need to scan those instructions. llvm-svn: 329822
47 lines
1.2 KiB
LLVM
47 lines
1.2 KiB
LLVM
; RUN: llc -fast-isel-sink-local-values < %s -mtriple=i686-pc-linux -mcpu=corei7 | FileCheck --check-prefix=DAG %s
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; RUN: llc -fast-isel-sink-local-values < %s -mtriple=i686-pc-linux -mcpu=corei7 -O0 | FileCheck --check-prefix=FAST %s
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%struct.s1 = type { double, float }
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define void @g1() nounwind {
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entry:
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%tmp = alloca %struct.s1, align 4
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call void @f(%struct.s1* inreg sret %tmp, i32 inreg 41, i32 inreg 42, i32 43)
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ret void
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; DAG-LABEL: g1:
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; DAG: subl $[[AMT:.*]], %esp
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; DAG-NEXT: $43, (%esp)
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; DAG-NEXT: leal 16(%esp), %eax
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; DAG-NEXT: movl $41, %edx
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; DAG-NEXT: movl $42, %ecx
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; DAG-NEXT: calll f
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; DAG-NEXT: addl $[[AMT]], %esp
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; DAG-NEXT: ret
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; FAST-LABEL: g1:
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; FAST: subl $[[AMT:.*]], %esp
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; FAST-NEXT: leal 16(%esp), %eax
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; FAST-NEXT: movl $41, %edx
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; FAST-NEXT: movl $42, %ecx
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; FAST: $43, (%esp)
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; FAST: calll f
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; FAST-NEXT: addl $[[AMT]], %esp
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; FAST: ret
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}
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declare void @f(%struct.s1* inreg sret, i32 inreg, i32 inreg, i32)
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%struct.s2 = type {}
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define void @g2(%struct.s2* inreg sret %agg.result) nounwind {
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entry:
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ret void
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; DAG: g2
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; DAG-NOT: ret $4
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; DAG: .size g2
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; FAST: g2
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; FAST-NOT: ret $4
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; FAST: .size g2
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}
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