forked from OSchip/llvm-project
57 lines
2.3 KiB
LLVM
57 lines
2.3 KiB
LLVM
; RUN: llc < %s | FileCheck %s
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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%structTy = type { i8, i32, i32 }
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@e = common global %structTy zeroinitializer, align 4
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;; Ensure that MergeConsecutiveStores doesn't incorrectly reorder
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;; store operations. The first test stores in increasing address
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;; order, the second in decreasing -- but in both cases should have
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;; the same result in memory in the end.
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; CHECK-LABEL: redundant_stores_merging:
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; CHECK: movabsq $528280977409, %rax
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; CHECK: movq %rax, e+4(%rip)
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; CHECK: movl $456, e+8(%rip)
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define void @redundant_stores_merging() {
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entry:
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store i32 1, i32* getelementptr inbounds (%structTy, %structTy* @e, i64 0, i32 1), align 4
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store i32 123, i32* getelementptr inbounds (%structTy, %structTy* @e, i64 0, i32 2), align 4
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store i32 456, i32* getelementptr inbounds (%structTy, %structTy* @e, i64 0, i32 2), align 4
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ret void
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}
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;; This variant tests PR25154.
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; CHECK-LABEL: redundant_stores_merging_reverse:
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; CHECK: movabsq $528280977409, %rax
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; CHECK: movq %rax, e+4(%rip)
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; CHECK: movl $456, e+8(%rip)
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define void @redundant_stores_merging_reverse() {
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entry:
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store i32 123, i32* getelementptr inbounds (%structTy, %structTy* @e, i64 0, i32 2), align 4
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store i32 456, i32* getelementptr inbounds (%structTy, %structTy* @e, i64 0, i32 2), align 4
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store i32 1, i32* getelementptr inbounds (%structTy, %structTy* @e, i64 0, i32 1), align 4
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ret void
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}
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@b = common global [8 x i8] zeroinitializer, align 2
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;; The 2-byte store to offset 3 overlaps the 2-byte store to offset 2;
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;; these must not be reordered in MergeConsecutiveStores such that the
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;; store to 3 comes first (e.g. by merging the stores to 0 and 2 into
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;; a movl, after the store to 3).
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;; CHECK-LABEL: overlapping_stores_merging:
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;; CHECK: movl $1, b(%rip)
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;; CHECK: movw $2, b+3(%rip)
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define void @overlapping_stores_merging() {
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entry:
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store i16 0, i16* bitcast (i8* getelementptr inbounds ([8 x i8], [8 x i8]* @b, i64 0, i64 2) to i16*), align 2
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store i16 2, i16* bitcast (i8* getelementptr inbounds ([8 x i8], [8 x i8]* @b, i64 0, i64 3) to i16*), align 1
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store i16 1, i16* bitcast (i8* getelementptr inbounds ([8 x i8], [8 x i8]* @b, i64 0, i64 0) to i16*), align 2
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ret void
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}
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