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https://github.com/c64scene-ar/llvm-6502.git
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8f90b6eb2f
v1024 = EDI // not killed
=
= EDI
One possible solution is for the coalescer to examine the sub-register live intervals in the same manner as the physical register. Another possibility is to examine defs and uses (when needed) of sub-registers. Both solutions are too expensive. For now, look for "short virtual intervals" and scan instructions to look for conflict instead.
This is a small win on x86-64. e.g. It shaves 403.gcc by ~80 instructions.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@61847 91177308-0d34-0410-b5e6-96231b3b80d8
25 lines
1.1 KiB
LLVM
25 lines
1.1 KiB
LLVM
; RUN: llvm-as < %s | llc -mtriple=x86_64-apple-darwin9 -mattr=+sse2 | not grep movl
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%struct.dpoint = type { double, double }
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define %struct.dpoint @midpoint(i64 %p1.0, i64 %p2.0) nounwind readnone {
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entry:
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%0 = trunc i64 %p1.0 to i32 ; <i32> [#uses=1]
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%1 = sitofp i32 %0 to double ; <double> [#uses=1]
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%2 = trunc i64 %p2.0 to i32 ; <i32> [#uses=1]
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%3 = sitofp i32 %2 to double ; <double> [#uses=1]
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%4 = add double %1, %3 ; <double> [#uses=1]
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%5 = mul double %4, 5.000000e-01 ; <double> [#uses=1]
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%6 = lshr i64 %p1.0, 32 ; <i64> [#uses=1]
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%7 = trunc i64 %6 to i32 ; <i32> [#uses=1]
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%8 = sitofp i32 %7 to double ; <double> [#uses=1]
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%9 = lshr i64 %p2.0, 32 ; <i64> [#uses=1]
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%10 = trunc i64 %9 to i32 ; <i32> [#uses=1]
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%11 = sitofp i32 %10 to double ; <double> [#uses=1]
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%12 = add double %8, %11 ; <double> [#uses=1]
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%13 = mul double %12, 5.000000e-01 ; <double> [#uses=1]
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%mrv3 = insertvalue %struct.dpoint undef, double %5, 0 ; <%struct.dpoint> [#uses=1]
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%mrv4 = insertvalue %struct.dpoint %mrv3, double %13, 1 ; <%struct.dpoint> [#uses=1]
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ret %struct.dpoint %mrv4
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}
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