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[X86] Add comments to clarify some non-obvious lines in the stackmap-nops.ll

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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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Lang Hames committed 2014-07-25 04:50:08 +00:00
1 parent b984536dad
commit b64f8426f2
2 files changed
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test/CodeGen/X86/stackmap-nops.ll
+3
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@@ -224,6 +224,9 @@ entry:
tail call void (i64, i32, ...)* @llvm.experimental.stackmap(i64 28, i32 28)
tail call void (i64, i32, ...)* @llvm.experimental.stackmap(i64 29, i32 29)
tail call void (i64, i32, ...)* @llvm.experimental.stackmap(i64 30, i32 30)
; Add an extra stackmap with a zero-length shadow to thwart the shadow
; optimization. This will force all 15 bytes of the previous shadow to be
; padded with nops.
tail call void (i64, i32, ...)* @llvm.experimental.stackmap(i64 31, i32 0)
ret void
}
test/MC/X86/stackmap-nops.ll
+3
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@@ -41,6 +41,9 @@ entry:
tail call void (i64, i32, ...)* @llvm.experimental.stackmap(i64 13, i32 13)
tail call void (i64, i32, ...)* @llvm.experimental.stackmap(i64 14, i32 14)
tail call void (i64, i32, ...)* @llvm.experimental.stackmap(i64 15, i32 15)
; Add an extra stackmap with a zero-length shadow to thwart the shadow
; optimization. This will force all 15 bytes of the previous shadow to be
; padded with nops.
tail call void (i64, i32, ...)* @llvm.experimental.stackmap(i64 16, i32 0)
ret void
}