Subzero: x8664: Fix a "uitofp i32 to double" lowering error.

The movzx instruction in the lowering sequence should not be allowed to be elided. BUG= https://bugs.chromium.org/p/nativeclient/issues/detail?id=4379 R=jpp@chromium.org Review URL: https://codereview.chromium.org/2335933002 .

Subzero: x8664: Fix a "uitofp i32 to double" lowering error.
74bfa871 · Jim Stichnoth · 5a9f714f · 74bfa871
Commit 74bfa871 authored Sep 12, 2016 by Jim Stichnoth
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IceTargetLoweringX86BaseImpl.h src/IceTargetLoweringX86BaseImpl.h +1 -1

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--- a/src/IceTargetLoweringX86BaseImpl.h
+++ b/src/IceTargetLoweringX86BaseImpl.h
@@ -3062,7 +3062,7 @@ void TargetX86Base<TraitsType>::lowerCast(const InstCast *Instr) {
      if (Src0RM->getType() == T_1->getType())
        _mov(T_1, Src0RM);
      else
-        _movzx(T_1, Src0RM);
+        _movzx(T_1, Src0RM)->setMustKeep();
      _cvt(T_2, T_1, Traits::Insts::Cvt::Si2ss);
      _mov(Dest, T_2);
    }