482898d9e2
Keeping bitcasts in the common_bitcast() test, otherwise sinking no longer occurs there. GVNSink seems to have a silly cost model where sinking just the stores is considered non-profitable, but sinking the stores and bitcasts (which are free...) is profitable. As this is not a default-enabled pass, and this problem would exist without opaque pointers as well, I'm not trying to do anything about this.
72 lines
1.9 KiB
LLVM
72 lines
1.9 KiB
LLVM
; RUN: opt -passes=gvn-sink -S < %s | FileCheck %s
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%struct = type {i32, i32, i32}
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%struct2 = type { [ 2 x i32], i32 }
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; Struct indices cannot be variant.
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; CHECK-LABEL: @f() {
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; CHECK: getelementptr
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; CHECK: getelementptr
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define void @f() {
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bb:
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br i1 undef, label %bb2, label %bb1
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bb1: ; preds = %bb
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%tmp = getelementptr inbounds %struct, ptr null, i64 0, i32 1
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br label %bb4
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bb2: ; preds = %bb
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%tmp3 = getelementptr inbounds %struct, ptr null, i64 0, i32 2
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br label %bb4
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bb4: ; preds = %bb2, %bb1
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%tmp5 = phi i32 [ 1, %bb1 ], [ 2, %bb2 ]
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ret void
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}
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; Struct indices cannot be variant.
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; CHECK-LABEL: @g() {
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; CHECK: getelementptr
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; CHECK: getelementptr
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define void @g() {
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bb:
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br i1 undef, label %bb2, label %bb1
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bb1: ; preds = %bb
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%tmp = getelementptr inbounds %struct2, ptr null, i64 0, i32 0, i32 1
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br label %bb4
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bb2: ; preds = %bb
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%tmp3 = getelementptr inbounds %struct2, ptr null, i64 0, i32 0, i32 2
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br label %bb4
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bb4: ; preds = %bb2, %bb1
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%tmp5 = phi i32 [ 1, %bb1 ], [ 2, %bb2 ]
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ret void
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}
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; ... but the first parameter to a GEP can.
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; CHECK-LABEL: @h() {
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; CHECK: getelementptr
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; CHECK-NOT: getelementptr
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define void @h() {
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bb:
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br i1 undef, label %bb2, label %bb1
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bb1: ; preds = %bb
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%tmp = getelementptr inbounds %struct, ptr null, i32 1, i32 0
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br label %bb4
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bb2: ; preds = %bb
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%tmp3 = getelementptr inbounds %struct, ptr null, i32 2, i32 0
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br label %bb4
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bb4: ; preds = %bb2, %bb1
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%tmp5 = phi i32 [ 1, %bb1 ], [ 2, %bb2 ]
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ret void
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}
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