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MOV64rm should be marked isReMaterializable.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@89019 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2009-11-17 00:55:55 +00:00
parent e0f06c78d3
commit 6cccc30679
2 changed files with 43 additions and 1 deletions
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2
lib/Target/X86/X86Instr64bit.td
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@ -309,7 +309,7 @@ def MOV64ri32 : RIi32<0xC7, MRM0r, (outs GR64:$dst), (ins i64i32imm:$src),
[(set GR64:$dst, i64immSExt32:$src)]>;
}
let canFoldAsLoad = 1 in
let canFoldAsLoad = 1, isReMaterializable = 1, mayHaveSideEffects = 1 in
def MOV64rm : RI<0x8B, MRMSrcMem, (outs GR64:$dst), (ins i64mem:$src),
"mov{q}\t{$src, $dst|$dst, $src}",
[(set GR64:$dst, (load addr:$src))]>;

42
test/CodeGen/X86/2009-11-16-MachineLICM.ll Normal file
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@ -0,0 +1,42 @@
; RUN: llc < %s -mtriple=x86_64-apple-darwin | FileCheck %s
; rdar://7395200
@g = common global [4 x float] zeroinitializer, align 16 ; <[4 x float]*> [#uses=4]
define void @foo(i32 %n, float* nocapture %x) nounwind ssp {
entry:
; CHECK: foo:
%0 = icmp sgt i32 %n, 0 ; <i1> [#uses=1]
br i1 %0, label %bb.nph, label %return
bb.nph: ; preds = %entry
; CHECK: movq _g@GOTPCREL(%rip), %rcx
%tmp = zext i32 %n to i64 ; <i64> [#uses=1]
br label %bb
bb: ; preds = %bb, %bb.nph
; CHECK: LBB1_2:
%indvar = phi i64 [ 0, %bb.nph ], [ %indvar.next, %bb ] ; <i64> [#uses=2]
%tmp9 = shl i64 %indvar, 2 ; <i64> [#uses=4]
%tmp1016 = or i64 %tmp9, 1 ; <i64> [#uses=1]
%scevgep = getelementptr float* %x, i64 %tmp1016 ; <float*> [#uses=1]
%tmp1117 = or i64 %tmp9, 2 ; <i64> [#uses=1]
%scevgep12 = getelementptr float* %x, i64 %tmp1117 ; <float*> [#uses=1]
%tmp1318 = or i64 %tmp9, 3 ; <i64> [#uses=1]
%scevgep14 = getelementptr float* %x, i64 %tmp1318 ; <float*> [#uses=1]
%x_addr.03 = getelementptr float* %x, i64 %tmp9 ; <float*> [#uses=1]
%1 = load float* getelementptr inbounds ([4 x float]* @g, i64 0, i64 0), align 16 ; <float> [#uses=1]
store float %1, float* %x_addr.03, align 4
%2 = load float* getelementptr inbounds ([4 x float]* @g, i64 0, i64 1), align 4 ; <float> [#uses=1]
store float %2, float* %scevgep, align 4
%3 = load float* getelementptr inbounds ([4 x float]* @g, i64 0, i64 2), align 8 ; <float> [#uses=1]
store float %3, float* %scevgep12, align 4
%4 = load float* getelementptr inbounds ([4 x float]* @g, i64 0, i64 3), align 4 ; <float> [#uses=1]
store float %4, float* %scevgep14, align 4
%indvar.next = add i64 %indvar, 1 ; <i64> [#uses=2]
%exitcond = icmp eq i64 %indvar.next, %tmp ; <i1> [#uses=1]
br i1 %exitcond, label %return, label %bb
return: ; preds = %bb, %entry
ret void
}