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fb437bc669
Teach the register stackifier to rematerialize constants that have multiple uses instead of leaving them in registers. In the WebAssembly encoding, it's the same code size to materialize most constants as it is to read a value from a register. llvm-svn: 258142
52 lines
1.5 KiB
LLVM
52 lines
1.5 KiB
LLVM
; RUN: llc < %s -asm-verbose=false -verify-machineinstrs | FileCheck %s
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; Check that unused vregs aren't assigned registers.
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target datalayout = "e-m:e-p:32:32-i64:64-n32:64-S128"
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target triple = "wasm32-unknown-unknown"
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define void @foo(i32* nocapture %a, i32 %w, i32 %h) {
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; CHECK-LABEL: foo:
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; CHECK-NEXT: .param i32, i32, i32{{$}}
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; CHECK-NEXT: .local i32, i32, i32, i32, i32, i32{{$}}
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entry:
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%cmp.19 = icmp sgt i32 %h, 0
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br i1 %cmp.19, label %for.cond.1.preheader.lr.ph, label %for.end.7
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for.cond.1.preheader.lr.ph:
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%cmp2.17 = icmp sgt i32 %w, 0
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br label %for.cond.1.preheader
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for.cond.1.preheader:
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%y.020 = phi i32 [ 0, %for.cond.1.preheader.lr.ph ], [ %inc6, %for.inc.5 ]
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br i1 %cmp2.17, label %for.body.3.lr.ph, label %for.inc.5
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for.body.3.lr.ph:
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%mul4 = mul nsw i32 %y.020, %w
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br label %for.body.3
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for.body.3:
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%x.018 = phi i32 [ 0, %for.body.3.lr.ph ], [ %inc, %for.body.3 ]
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%mul = mul nsw i32 %x.018, %y.020
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%add = add nsw i32 %x.018, %mul4
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%arrayidx = getelementptr inbounds i32, i32* %a, i32 %add
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store i32 %mul, i32* %arrayidx, align 4
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%inc = add nuw nsw i32 %x.018, 1
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%exitcond = icmp eq i32 %inc, %w
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br i1 %exitcond, label %for.inc.5.loopexit, label %for.body.3
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for.inc.5.loopexit:
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br label %for.inc.5
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for.inc.5:
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%inc6 = add nuw nsw i32 %y.020, 1
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%exitcond22 = icmp eq i32 %inc6, %h
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br i1 %exitcond22, label %for.end.7.loopexit, label %for.cond.1.preheader
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for.end.7.loopexit:
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br label %for.end.7
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for.end.7:
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ret void
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}
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