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[X86] Add comments to clarify some non-obvious lines in the stackmap-nops.ll
testcases. Based on code review from Philip Reames. Thanks Philip! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@213923 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -224,6 +224,9 @@ entry:
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tail call void (i64, i32, ...)* @llvm.experimental.stackmap(i64 28, i32 28)
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tail call void (i64, i32, ...)* @llvm.experimental.stackmap(i64 29, i32 29)
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tail call void (i64, i32, ...)* @llvm.experimental.stackmap(i64 30, i32 30)
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; Add an extra stackmap with a zero-length shadow to thwart the shadow
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; optimization. This will force all 15 bytes of the previous shadow to be
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; padded with nops.
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tail call void (i64, i32, ...)* @llvm.experimental.stackmap(i64 31, i32 0)
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ret void
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}
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@ -41,6 +41,9 @@ entry:
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tail call void (i64, i32, ...)* @llvm.experimental.stackmap(i64 13, i32 13)
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tail call void (i64, i32, ...)* @llvm.experimental.stackmap(i64 14, i32 14)
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tail call void (i64, i32, ...)* @llvm.experimental.stackmap(i64 15, i32 15)
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; Add an extra stackmap with a zero-length shadow to thwart the shadow
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; optimization. This will force all 15 bytes of the previous shadow to be
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; padded with nops.
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tail call void (i64, i32, ...)* @llvm.experimental.stackmap(i64 16, i32 0)
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ret void
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}
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