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TheRock/compiler/amd-llvm/llvm/test/Transforms/FunctionSpecialization/remove-dead-recursive-function.ll
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derek.holloway 7502bf64a4
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Flatten subprojects into a single base monorepo
2026-09-02 16:34:47 -07:00

60 lines
1.5 KiB
LLVM

; RUN: opt -passes="ipsccp<func-spec>" -funcspec-min-function-size=3 -S < %s | FileCheck %s
define i64 @main(i64 %x, i1 %flag) {
entry:
br i1 %flag, label %plus, label %minus
plus:
%tmp0 = call i64 @compute(i64 %x, ptr @plus)
br label %merge
minus:
%tmp1 = call i64 @compute(i64 %x, ptr @minus)
br label %merge
merge:
%tmp2 = phi i64 [ %tmp0, %plus ], [ %tmp1, %minus]
ret i64 %tmp2
}
; CHECK-NOT: define internal i64 @compute(
;
; CHECK-LABEL: define internal i64 @compute.specialized.1(i64 %n, ptr %binop) {
; CHECK: [[TMP0:%.+]] = call i64 @plus(i64 %n)
; CHECK: [[TMP1:%.+]] = call i64 @compute.specialized.1(i64 [[TMP2:%.+]], ptr @plus)
; CHECK: add nsw i64 [[TMP1]], [[TMP0]]
;
; CHECK-LABEL: define internal i64 @compute.specialized.2(i64 %n, ptr %binop) {
; CHECK: [[TMP0:%.+]] = call i64 @minus(i64 %n)
; CHECK: [[TMP1:%.+]] = call i64 @compute.specialized.2(i64 [[TMP2:%.+]], ptr @minus)
; CHECK: add nsw i64 [[TMP1]], [[TMP0]]
;
define internal i64 @compute(i64 %n, ptr %binop) {
entry:
%cmp = icmp sgt i64 %n, 0
br i1 %cmp, label %if.then, label %if.end
if.then:
%call = call i64 %binop(i64 %n)
%sub = add nsw i64 %n, -1
%call1 = call i64 @compute(i64 %sub, ptr %binop)
%add2 = add nsw i64 %call1, %call
br label %if.end
if.end:
%result.0 = phi i64 [ %add2, %if.then ], [ 0, %entry ]
ret i64 %result.0
}
define internal i64 @plus(i64 %x) {
entry:
%tmp0 = add i64 %x, 1
ret i64 %tmp0
}
define internal i64 @minus(i64 %x) {
entry:
%tmp0 = sub i64 %x, 1
ret i64 %tmp0
}