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Small-data (i.e. GP-relative) loads and stores allow 16-bit scaled offset. For a load of a value of type T, the small-data area is equivalent to an array "T sdata[65536]". This implies that objects of smaller sizes need to be closer to the beginning of sdata, while larger objects may be farther away, or otherwise the offset may be insufficient to reach it. Similarly, an object of a larger size should not be accessed via a load of a smaller size. llvm-svn: 345975
20 lines
512 B
LLVM
20 lines
512 B
LLVM
; RUN: llc -march=hexagon -hexagon-small-data-threshold=8 < %s | FileCheck %s
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; CHECK: = memd(gp+#g0)
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; If an object will be placed in .sdata, do not shrink any references to it.
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; In this case, g0 must be loaded via memd.
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target triple = "hexagon"
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@g0 = common global i64 0, align 8
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define i32 @f0() #0 {
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entry:
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%v0 = load i64, i64* @g0, align 8
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%v1 = trunc i64 %v0 to i8
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%v2 = zext i8 %v1 to i32
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ret i32 %v2
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}
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attributes #0 = { nounwind "target-cpu"="hexagonv60" "target-features"="+small-data" }
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