5fc9449c96
It doesn't matter which value we use for dead args, so let's switch to poison, so we can eventually kill undef. Reviewed By: aeubanks, fhahn Differential Revision: https://reviews.llvm.org/D125983
68 lines
2.5 KiB
LLVM
68 lines
2.5 KiB
LLVM
; RUN: opt -S %s -deadargelim -o - | FileCheck %s
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; In that test @internal_fct is used by an instruction
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; we don't know how to rewrite (the comparison that produces
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; %cmp1).
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; Because of that use, we used to bail out on removing the
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; unused arguments for this function.
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; Yet, we should still be able to rewrite the direct calls that are
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; statically known, by replacing the related arguments with poison.
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; This is what we check on the call that produces %res2.
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define i32 @call_indirect(i32 (i32, i32, i32)* readnone %fct_ptr, i32 %arg1, i32 %arg2, i32 %arg3) {
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; CHECK-LABEL: @call_indirect(
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; CHECK-NEXT: [[CMP0:%.*]] = icmp eq i32 (i32, i32, i32)* [[FCT_PTR:%.*]], @external_fct
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; CHECK-NEXT: br i1 [[CMP0]], label [[CALL_EXT:%.*]], label [[CHK2:%.*]]
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; CHECK: call_ext:
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; CHECK-NEXT: [[RES1:%.*]] = tail call i32 @external_fct(i32 poison, i32 [[ARG2:%.*]], i32 poison)
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; CHECK-NEXT: br label [[END:%.*]]
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; CHECK: chk2:
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; CHECK-NEXT: [[CMP1:%.*]] = icmp eq i32 (i32, i32, i32)* [[FCT_PTR]], @internal_fct
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; CHECK-NEXT: br i1 [[CMP1]], label [[CALL_INT:%.*]], label [[CALL_OTHER:%.*]]
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; CHECK: call_int:
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; CHECK-NEXT: [[RES2:%.*]] = tail call i32 @internal_fct(i32 poison, i32 [[ARG2]], i32 poison)
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; CHECK-NEXT: br label [[END]]
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; CHECK: call_other:
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; CHECK-NEXT: [[RES3:%.*]] = tail call i32 @other_fct(i32 [[ARG2]])
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; CHECK-NEXT: br label [[END]]
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; CHECK: end:
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; CHECK-NEXT: [[FINAL_RES:%.*]] = phi i32 [ [[RES1]], [[CALL_EXT]] ], [ [[RES2]], [[CALL_INT]] ], [ [[RES3]], [[CALL_OTHER]] ]
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; CHECK-NEXT: ret i32 [[FINAL_RES]]
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;
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%cmp0 = icmp eq i32 (i32, i32, i32)* %fct_ptr, @external_fct
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br i1 %cmp0, label %call_ext, label %chk2
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call_ext:
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%res1 = tail call i32 @external_fct(i32 %arg1, i32 %arg2, i32 %arg3)
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br label %end
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chk2:
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%cmp1 = icmp eq i32 (i32, i32, i32)* %fct_ptr, @internal_fct
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br i1 %cmp1, label %call_int, label %call_other
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call_int:
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%res2 = tail call i32 @internal_fct(i32 %arg1, i32 %arg2, i32 %arg3)
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br label %end
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call_other:
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%res3 = tail call i32 @other_fct(i32 %arg1, i32 %arg2, i32 %arg3)
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br label %end
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end:
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%final_res = phi i32 [%res1, %call_ext], [%res2, %call_int], [%res3, %call_other]
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ret i32 %final_res
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}
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define i32 @external_fct(i32 %unused_arg1, i32 %arg2, i32 %unused_arg3) {
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ret i32 %arg2
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}
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define internal i32 @internal_fct(i32 %unused_arg1, i32 %arg2, i32 %unused_arg3) {
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ret i32 %arg2
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}
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define internal i32 @other_fct(i32 %unused_arg1, i32 %arg2, i32 %unused_arg3) {
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ret i32 %arg2
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}
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