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c89c722370
The RegisterCoalescer understands overlapping live ranges where one register is defined as a copy of the other. With this change, register allocators using LiveRegMatrix can do the same, at least for copies between physical and virtual registers. When a physreg is defined by a copy from a virtreg, allow those live ranges to overlap: %CL<def> = COPY %vreg11:sub_8bit; GR32_ABCD:%vreg11 %vreg13<def,tied1> = SAR32rCL %vreg13<tied0>, %CL<imp-use,kill> We can assign %vreg11 to %ECX, overlapping the live range of %CL. llvm-svn: 163336
21 lines
801 B
LLVM
21 lines
801 B
LLVM
; RUN: llc < %s -march=ppc32 -mcpu=g5 -mtriple=powerpc-apple-darwin10.0 | FileCheck %s
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; ModuleID = 'nn.c'
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target datalayout = "E-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f128:64:128"
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target triple = "powerpc-apple-darwin11.0"
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; Indirect calls must use R12 on Darwin (i.e., R12 must contain the address of
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; the function being called; the mtctr is not required to use it).
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@p = external global void (...)* ; <void (...)**> [#uses=1]
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define void @foo() nounwind ssp {
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entry:
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; CHECK: mtctr r12
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; CHECK: bctrl
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%0 = load void (...)** @p, align 4 ; <void (...)*> [#uses=1]
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call void (...)* %0() nounwind
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br label %return
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return: ; preds = %entry
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ret void
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}
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