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4aa22e2c8d
The TwoAddressInstructionPass takes the machine code out of SSA form by expanding REG_SEQUENCE instructions into copies. It is no longer necessary to rewrite the registers used by a REG_SEQUENCE instruction because the new coalescer algorithm can do it now. REG_SEQUENCE is just converted to a sequence of sub-register copies now. llvm-svn: 169067
53 lines
2.3 KiB
LLVM
53 lines
2.3 KiB
LLVM
; RUN: llc < %s -relocation-model=pic -disable-fp-elim -mcpu=cortex-a8 -pre-RA-sched=source | FileCheck %s
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target triple = "thumbv7-apple-ios"
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; <rdar://problem/10032939>
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;
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; The vector %v2 is built like this:
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;
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; %vreg6:ssub_1<def> = ...
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; %vreg6:ssub_0<def> = VLDRS <cp#0>, 0, pred:14, pred:%noreg; mem:LD4[ConstantPool] DPR_VFP2:%vreg6
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;
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; When %vreg6 spills, the VLDRS constant pool load cannot be rematerialized
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; since it implicitly reads the ssub_1 sub-register.
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;
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; CHECK: f1
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; CHECK: vmov d0, r0, r0
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; CHECK: vldr s1, LCPI
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; The vector must be spilled:
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; CHECK: vstr d0,
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; CHECK: asm clobber d0
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; And reloaded after the asm:
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; CHECK: vldr [[D16:d[0-9]+]],
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; CHECK: vstr [[D16]], [r1]
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define void @f1(float %x, <2 x float>* %p) {
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%v1 = insertelement <2 x float> undef, float %x, i32 0
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%v2 = insertelement <2 x float> %v1, float 0x400921FB60000000, i32 1
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%y = call double asm sideeffect "asm clobber $0", "=w,0,~{d1},~{d2},~{d3},~{d4},~{d5},~{d6},~{d7},~{d8},~{d9},~{d10},~{d11},~{d12},~{d13},~{d14},~{d15},~{d16},~{d17},~{d18},~{d19},~{d20},~{d21},~{d22},~{d23},~{d24},~{d25},~{d26},~{d27},~{d28},~{d29},~{d30},~{d31}"(<2 x float> %v2) nounwind
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store <2 x float> %v2, <2 x float>* %p, align 8
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ret void
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}
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; On the other hand, when the partial redef doesn't read the full register
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; because the bits are undef, we should rematerialize. The vector is now built
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; like this:
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;
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; %vreg2:ssub_0<def> = VLDRS <cp#0>, 0, pred:14, pred:%noreg, %vreg2<imp-def>; mem:LD4[ConstantPool]
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;
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; The extra <imp-def> operand indicates that the instruction fully defines the
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; virtual register. It doesn't read the old value.
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;
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; CHECK: f2
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; CHECK: vldr s0, LCPI
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; The vector must not be spilled:
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; CHECK-NOT: vstr
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; CHECK: asm clobber d0
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; But instead rematerialize after the asm:
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; CHECK: vldr [[S0:s[0-9]+]], LCPI
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; CHECK: vstr [[D0:d[0-9]+]], [r0]
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define void @f2(<2 x float>* %p) {
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%v2 = insertelement <2 x float> undef, float 0x400921FB60000000, i32 0
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%y = call double asm sideeffect "asm clobber $0", "=w,0,~{d1},~{d2},~{d3},~{d4},~{d5},~{d6},~{d7},~{d8},~{d9},~{d10},~{d11},~{d12},~{d13},~{d14},~{d15},~{d16},~{d17},~{d18},~{d19},~{d20},~{d21},~{d22},~{d23},~{d24},~{d25},~{d26},~{d27},~{d28},~{d29},~{d30},~{d31}"(<2 x float> %v2) nounwind
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store <2 x float> %v2, <2 x float>* %p, align 8
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ret void
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}
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