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Another micro-opt.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@42554 91177308-0d34-0410-b5e6-96231b3b80d8
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@@ -1306,3 +1306,19 @@ However, ICC caches this information before the loop and produces this:
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movl 88(%esp), %eax #481.12
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movl 88(%esp), %eax #481.12
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//===---------------------------------------------------------------------===//
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//===---------------------------------------------------------------------===//
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This code:
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%tmp659 = icmp slt i16 %tmp654, 0 ; <i1> [#uses=1]
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br i1 %tmp659, label %cond_true662, label %cond_next715
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produces this:
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testw %cx, %cx
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movswl %cx, %esi
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jns LBB4_109 # cond_next715
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Shark tells us that using %cx in the testw instruction is sub-optimal. It
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suggests using the 32-bit register (which is what ICC uses).
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//===---------------------------------------------------------------------===//
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