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https://github.com/c64scene-ar/llvm-6502.git
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6977e79526
savings from a pointer argument becoming an alloca. Sometimes callees will even compare a pointer to null and then branch to an otherwise unreachable block! Detect these cases and compute the number of saved instructions, instead of bailing out and reporting no savings. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@148941 91177308-0d34-0410-b5e6-96231b3b80d8
84 lines
1.9 KiB
LLVM
84 lines
1.9 KiB
LLVM
; RUN: opt -inline < %s -S -o - -inline-threshold=8 | FileCheck %s
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declare void @llvm.lifetime.start(i64 %size, i8* nocapture %ptr)
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@glbl = external global i32
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define void @outer1() {
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; CHECK: @outer1
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; CHECK-NOT: call void @inner1
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%ptr = alloca i32
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call void @inner1(i32* %ptr)
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ret void
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}
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define void @inner1(i32 *%ptr) {
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%A = load i32* %ptr
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store i32 0, i32* %ptr
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%C = getelementptr i32* %ptr, i32 0
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%D = getelementptr i32* %ptr, i32 1
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%E = bitcast i32* %ptr to i8*
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%F = select i1 false, i32* %ptr, i32* @glbl
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call void @llvm.lifetime.start(i64 0, i8* %E)
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ret void
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}
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define void @outer2() {
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; CHECK: @outer2
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; CHECK: call void @inner2
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%ptr = alloca i32
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call void @inner2(i32* %ptr)
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ret void
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}
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; %D poisons this call, scalar-repl can't handle that instruction.
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define void @inner2(i32 *%ptr) {
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%A = load i32* %ptr
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store i32 0, i32* %ptr
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%C = getelementptr i32* %ptr, i32 0
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%D = getelementptr i32* %ptr, i32 %A
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%E = bitcast i32* %ptr to i8*
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%F = select i1 false, i32* %ptr, i32* @glbl
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call void @llvm.lifetime.start(i64 0, i8* %E)
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ret void
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}
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define void @outer3() {
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; CHECK: @outer3
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; CHECK-NOT: call void @inner3
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%ptr = alloca i32
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call void @inner3(i32* %ptr, i1 undef)
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ret void
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}
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define void @inner3(i32 *%ptr, i1 %x) {
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%A = icmp eq i32* %ptr, null
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%B = and i1 %x, %A
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br i1 %A, label %bb.true, label %bb.false
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bb.true:
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; This block musn't be counted in the inline cost.
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%t1 = load i32* %ptr
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%t2 = add i32 %t1, 1
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%t3 = add i32 %t2, 1
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%t4 = add i32 %t3, 1
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%t5 = add i32 %t4, 1
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%t6 = add i32 %t5, 1
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%t7 = add i32 %t6, 1
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%t8 = add i32 %t7, 1
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%t9 = add i32 %t8, 1
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%t10 = add i32 %t9, 1
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%t11 = add i32 %t10, 1
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%t12 = add i32 %t11, 1
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%t13 = add i32 %t12, 1
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%t14 = add i32 %t13, 1
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%t15 = add i32 %t14, 1
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%t16 = add i32 %t15, 1
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%t17 = add i32 %t16, 1
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%t18 = add i32 %t17, 1
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%t19 = add i32 %t18, 1
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%t20 = add i32 %t19, 1
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ret void
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bb.false:
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ret void
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}
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