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TheRock/compiler/amd-llvm/llvm/test/CodeGen/X86/gc-empty-basic-blocks.ll
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56 lines
1.6 KiB
LLVM

;; This test verifies that -enable-gc-empty-basic-blocks removes regular empty
;; blocks but does not remove empty blocks which have their address taken.
; RUN: llc < %s -mtriple=x86_64 -O0 -enable-gc-empty-basic-blocks | FileCheck %s
; RUN: llc < %s -mtriple=x86_64 -O0 -enable-gc-empty-basic-blocks -enable-new-pm | FileCheck %s
;; This function has a regular empty block.
define void @foo(i1 zeroext %0) nounwind {
br i1 %0, label %2, label %empty_block
; CHECK: .text
; CHECK-LABEL: foo:
; CHECK: jne .LBB0_1
; CHECK-NEXT: jmp .LBB0_3
2: ; preds = %1
%3 = call i32 @baz()
br label %4
; CHECK-LABEL: .LBB0_1:
; CHECK: jmp .LBB0_3
empty_block: ; preds = %1
unreachable
; CHECK-NOT: %empty_block
; CHECK-NOT: .LBB0_2
4: ; preds = %2, %empty_block
ret void
; CHECK-LABEL: .LBB0_3:
; CHECK: retq
}
;; This function has an empty block which has its address taken. Check that it
;; is not removed by -enable-gc-empty-basic-blocks.
define void @bar(i1 zeroext %0) nounwind {
entry:
%1 = select i1 %0, ptr blockaddress(@bar, %empty_block), ptr blockaddress(@bar, %bb2) ; <ptr> [#uses=1]
indirectbr ptr %1, [label %empty_block, label %bb2]
; CHECK-LABEL: bar:
empty_block: ; preds = %entry
unreachable
; CHECK-LABEL: .LBB1_1: # %empty_block
bb2: ; preds = %entry
%2 = call i32 @baz()
ret void
}
declare i32 @baz()