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https://github.com/c64scene-ar/llvm-6502.git
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1b05bb2900
CodeGen treats allocas outside the entry block as dynamically sized stack objects. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@204473 91177308-0d34-0410-b5e6-96231b3b80d8
144 lines
2.9 KiB
LLVM
144 lines
2.9 KiB
LLVM
; RUN: opt < %s -basicaa -sink -S | FileCheck %s
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@A = external global i32
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@B = external global i32
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; Sink should sink the load past the store (which doesn't overlap) into
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; the block that uses it.
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; CHECK-LABEL: @foo(
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; CHECK: true:
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; CHECK-NEXT: %l = load i32* @A
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; CHECK-NEXT: ret i32 %l
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define i32 @foo(i1 %z) {
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%l = load i32* @A
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store i32 0, i32* @B
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br i1 %z, label %true, label %false
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true:
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ret i32 %l
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false:
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ret i32 0
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}
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; But don't sink load volatiles...
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; CHECK-LABEL: @foo2(
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; CHECK: load volatile
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; CHECK-NEXT: store i32
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define i32 @foo2(i1 %z) {
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%l = load volatile i32* @A
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store i32 0, i32* @B
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br i1 %z, label %true, label %false
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true:
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ret i32 %l
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false:
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ret i32 0
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}
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; Sink to the nearest post-dominator
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; CHECK-LABEL: @diamond(
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; CHECK: X:
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; CHECK-NEXT: phi
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; CHECK-NEXT: mul nsw
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; CHECK-NEXT: sub
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define i32 @diamond(i32 %a, i32 %b, i32 %c) {
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%1 = mul nsw i32 %c, %b
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%2 = icmp sgt i32 %a, 0
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br i1 %2, label %B0, label %B1
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B0: ; preds = %0
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br label %X
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B1: ; preds = %0
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br label %X
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X: ; preds = %5, %3
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%.01 = phi i32 [ %c, %B0 ], [ %a, %B1 ]
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%R = sub i32 %1, %.01
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ret i32 %R
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}
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; We shouldn't sink constant sized allocas from the entry block, since CodeGen
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; interprets allocas outside the entry block as dynamically sized stack objects.
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; CHECK-LABEL: @alloca_nosink
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; CHECK: entry:
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; CHECK-NEXT: alloca
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define i32 @alloca_nosink(i32 %a, i32 %b) {
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entry:
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%0 = alloca i32
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%1 = icmp ne i32 %a, 0
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br i1 %1, label %if, label %endif
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if:
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%2 = getelementptr i32* %0, i32 1
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store i32 0, i32* %0
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store i32 1, i32* %2
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%3 = getelementptr i32* %0, i32 %b
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%4 = load i32* %3
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ret i32 %4
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endif:
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ret i32 0
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}
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; Make sure we sink dynamic sized allocas
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; CHECK-LABEL: @alloca_sink_dynamic
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; CHECK: entry:
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; CHECK-NOT: alloca
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; CHECK: if:
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; CHECK-NEXT: alloca
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define i32 @alloca_sink_dynamic(i32 %a, i32 %b, i32 %size) {
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entry:
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%0 = alloca i32, i32 %size
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%1 = icmp ne i32 %a, 0
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br i1 %1, label %if, label %endif
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if:
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%2 = getelementptr i32* %0, i32 1
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store i32 0, i32* %0
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store i32 1, i32* %2
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%3 = getelementptr i32* %0, i32 %b
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%4 = load i32* %3
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ret i32 %4
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endif:
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ret i32 0
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}
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; We also want to sink allocas that are not in the entry block. These
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; will already be considered as dynamically sized stack objects, so sinking
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; them does no further damage.
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; CHECK-LABEL: @alloca_sink_nonentry
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; CHECK: if0:
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; CHECK-NOT: alloca
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; CHECK: if:
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; CHECK-NEXT: alloca
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define i32 @alloca_sink_nonentry(i32 %a, i32 %b, i32 %c) {
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entry:
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%cmp = icmp ne i32 %c, 0
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br i1 %cmp, label %endif, label %if0
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if0:
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%0 = alloca i32
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%1 = icmp ne i32 %a, 0
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br i1 %1, label %if, label %endif
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if:
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%2 = getelementptr i32* %0, i32 1
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store i32 0, i32* %0
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store i32 1, i32* %2
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%3 = getelementptr i32* %0, i32 %b
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%4 = load i32* %3
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ret i32 %4
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endif:
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ret i32 0
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}
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